diff --git a/.travis.yml b/.travis.yml index 37727967b9..822a22279c 100644 --- a/.travis.yml +++ b/.travis.yml @@ -9,10 +9,11 @@ matrix: - env: VALIDATORS=tv4 install: - rm -rf ~/.nvm + - mkdir -p ~/.nvm - curl -L https://raw.githubusercontent.com/creationix/nvm/master/install.sh | sh - source ~/.nvm/nvm.sh - - nvm install 6.1 - - nvm use 6.1 + - nvm install 8 + - nvm use 8 script: - npm install - node node_modules/mdv/mdv versions/3.*.md diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md index 698eccfb69..b975f55b98 100644 --- a/DEVELOPMENT.md +++ b/DEVELOPMENT.md @@ -1,6 +1,6 @@ ## Development Guidelines -This document intends to establish guidelines which build a transparent, open mechanism for deciding how to evolve the OpenAPI Specification. The Open API Technical Developer Community will initially follow these processes when merging changes from external contributors or from the TDC itself. This guideline document will be adjusted as practicality dictates. +This document intends to establish guidelines which build a transparent, open mechanism for deciding how to evolve the OpenAPI Specification. The Open API Technical Steering Committee (TSC) will initially follow these processes when merging changes from external contributors or from the TSC itself. This guideline document will be adjusted as practicality dictates. ## OAI Specification Driving factors @@ -43,7 +43,7 @@ For each change in the specification we should _always_ consider the following: - Tooling. Strive to support code generation, software interfaces, and spec generation techniques. Some features may be impossible to support in different frameworks/languages. These should be documented and considered during the change approval process. - Visualization. Can the specification change be graphically visualized somehow in a UI or other interface? -Spec changes should be approved by a majority of the committers. Approval can be given by commenting on the issue itself, for example, "Approved by @fehguy". After voting criteria is met, any committer can merge the PR. (**TODO**: we will want to formalize what voting criteria actually is). +Spec changes should be approved by a majority of the committers. Approval can be given by commenting on the issue itself, for example, "Approved by @webron". After voting criteria is met, any committer can merge the PR. (**TODO**: we will want to formalize what voting criteria actually is). No change should be approved until there is documentation for it, supplied in an accompanying PR. diff --git a/GOVERNANCE.md b/GOVERNANCE.md new file mode 100644 index 0000000000..e9eda78d71 --- /dev/null +++ b/GOVERNANCE.md @@ -0,0 +1,31 @@ +# Governance + +The OpenAPI Specification is a project of the Open API Initiative (OAI), under the auspices of the Linux Foundation. For governance of the OAI, review the [OAI's charter](https://www.openapis.org/participate/how-to-contribute/governance). + +# Processes and procedures of the Technical Steering Committee (TSC) + +The TSC is a self-organizing sub-group of the OAI. Herein are its principles and guidelines. + +## 1. The establishment of roles and the responsibilities for each role + +Roles: + +* [Liaison](https://www.merriam-webster.com/dictionary/liaison) — Elected by TSC members in a plurality vote (oral count). Liaison represents the TSC to the OAI's Business Governing Board (BGB) at board meetings (though this itself does not confer voting rights) and is the public facing mouthpiece of the TSC. + +* [Maintainer](https://www.merriam-webster.com/dictionary/maintainer) — all and only members of the TSC are maintainers, and are responsible for approving proposed changes to the specification. If membership drops below 3, work is suspended until the BGB can re-establish the minimum. To maintain agility, the TSC should be capped at a maximum 9 members, though that number can be reconsidered by the TSC in the future. Past members will be noted as emeritus status once they are no longer members. + +* [Rick](https://www.youtube.com/watch?v=dQw4w9WgXcQ) — Responsible for not giving up or letting down. Requires plurality vote of TSC members. + +## 2. Adding members to the TSC + +A call-for-nominations period may be agreed upon by the TSC voting members and announced in a timely manner through [@OpenApiSpec](https://twitter.com/OpenApiSpec) on Twitter, assuming the TSC membership is not already at its maximum. A candidate may be nominated through a motion by a voting TSC member in a closed TSC meeting. A nominee must not receive opposition votes of more than 25% of the TSC voting membership via a confidential vote held electronically within a week following the nomination meeting. Approved nominees become provisional members and are expected to comport themselves as full members of the TSC during the provisional period of 4-6 weeks (to be determined at start of each nominating period), though nominees have no voting rights. The provisional period is concluded by a second, confidential vote similar to the nomination period's vote. At most there are four voting periods per year (no more than one every three months), with a minimum of one per year. + +## 3. Removal of membership from the TSC + +In dire situations, it may be necessary to remove a TSC member, such as behavior that violates the code of conduct (NB: whether non-participation merits removal is a decision left to the TSC voting members). 75% vote (confidential, electronic) of the other TSC members is required to remove a member. Otherwise, TSC members are removed when they renounce their position by informing the Liaison of their effective resignation date. + +## 4. Criteria for decisions + +The group will strive to achieve all decisions via unopposed consensus. When not possible, unresolved conflicts will be raised to the OAI's Technical Oversight Board (TOB). + +The TSC will maintain a publicly available document specifying the process in the contributor guidelines for how proposed changes are merged into the specification. The TSC will document and publicize the schedule of merge parties and release parties for the benefit of the developer community. diff --git a/IMPLEMENTATIONS.md b/IMPLEMENTATIONS.md index 96a2a2d6c1..e7411465f3 100644 --- a/IMPLEMENTATIONS.md +++ b/IMPLEMENTATIONS.md @@ -2,46 +2,60 @@ Below is a list of known tooling that implements the 3.0.0 specification. While support for the 3.0.0 specification matures, refer to the details of projects listed below for any notes about stability and roadmap. The process to improve the 3.x specification includes feedback from end-users and tooling creators. We strongly encourage draft tooling be made available for early users of OAS drafts. -These tools are not necessarily endorsed by the OAI. +These tools are not endorsed by the OAI. #### Low-Level tooling | Title | Project Link | Language |Description | |----------------|--------------|----------|---------------------| -| swagger-parser | [GitHub/swagger-api](https://github.com/swagger-api/swagger-parser/tree/feature/3.0.0-rc0) | Java | Swagger 1.0, 1.1, 1.2, 2.0 to Open API Specification converter | -| swagger-models | [GitHub/swagger-api](https://github.com/swagger-api/swagger-core/tree/feature/3.0.0-rc0/modules/swagger-models) | Java | Open API 3.0 Java Pojos | -| KaiZen OpenAPI Parser | [GitHub/RepreZen/KaiZen-OpenAPI-Parser](https://github.com/RepreZen/KaiZen-OpenAPI-Parser) | Java | High-performance Parser, Validator, and Java Object Model for OpenAPI 3.x | -| openapi3-ts | [GitHub/metadevpro/openapi3-ts](https://github.com/metadevpro/openapi3-ts) | TypeScript | TS Model & utils for OpenAPI 3.0.x contracts | -| swagger2openapi | [GitHub/mermade/swagger2openapi](https://github.com/mermade/swagger2openapi) | Node.js | An OpenAPI / Swagger 2.0 to OpenAPI 3.0.x converter and validator | -| Tavis.OpenApi | [GitHub/tavis-sofware/Tavis.OpenApi](https://github.com/tavis-software/Tavis.OpenApi/) | dotnet | C# based parser with definition validation and migration support from V2 | -| odata-openapi | [GitHub/oasis-tcs/odata-openapi](https://github.com/oasis-tcs/odata-openapi) | XSLT | OData 4.0 to OpenAPI 3.0.0 converter | +| swagger-parser | [github/swagger-api](https://github.com/swagger-api/swagger-parser/tree/feature/3.0.0-rc0) | Java | Swagger 1.0, 1.1, 1.2, 2.0 to OpenAPI Specification converter | +| swagger-models | [github/swagger-api](https://github.com/swagger-api/swagger-core/tree/feature/3.0.0-rc0/modules/swagger-models) | Java | OpenAPI 3.0 Java Pojos | +| KaiZen OpenAPI Parser | [github/RepreZen/KaiZen-OpenAPI-Parser](https://github.com/RepreZen/KaiZen-OpenAPI-Parser) | Java | High-performance Parser, Validator, and Java Object Model for OpenAPI 3.x | +| openapi3-ts | [github/metadevpro/openapi3-ts](https://github.com/metadevpro/openapi3-ts) | TypeScript | TS Model & utils for OpenAPI 3.0.x contracts | +| swagger2openapi | [github/mermade/swagger2openapi](https://github.com/mermade/swagger2openapi) | Node.js | An OpenAPI / Swagger 2.0 to OpenAPI 3.0.x converter and validator | +| Microsoft.OpenApi.net | [github/microsoft/OpenApi.net](https://github.com/microsoft/openapi.net/) | dotnet | C# based parser with definition validation and migration support from V2 | +| odata-openapi | [github/oasis-tcs/odata-openapi](https://github.com/oasis-tcs/odata-openapi) | XSLT | OData 4.0 to OpenAPI 3.0.0 converter | +| openapi3_parser | [github/kevindew/openapi3_parser](https://github.com/kevindew/openapi3_parser) | Ruby | A Ruby implementation of parser and validator for the OpenAPI 3 Specification | +| oas_parser | [github/Nexmo/oas_parser](https://github.com/Nexmo/oas_parser) | Ruby | An open source OpenAPI Spec 3 Definition Parser writen in Ruby | #### Editors | Title | Project Link | Language |Description | |----------------|--------------|----------|---------------------| -| KaiZen OpenAPI Editor | [GitHub/RepreZen/KaiZen-OpenAPI-Editor](https://github.com/RepreZen/KaiZen-OpenAPI-Editor) | Java | Eclipse Editor for OpenAPI 2.0 and 3.0 | +| Apicurio Studio | [github/Apicurio/apicurio-studio](https://github.com/Apicurio/apicurio-studio) | Java/Typescript | Web-Based **visual designer** for OpenAPI 2.0 and 3.0.0. | +| KaiZen OpenAPI Editor | [github/RepreZen/KaiZen-OpenAPI-Editor](https://github.com/RepreZen/KaiZen-OpenAPI-Editor) | Java | Eclipse Editor for OpenAPI 2.0 and 3.0 | | RepreZen API Studio | [RepreZen.com/OpenAPI](https://www.reprezen.com/OpenAPI) | Java | Commercial desktop IDE for API design, documentation & development | -| OpenApi-gui | [GitHub/Mermade/openapi-gui](https://github.com/Mermade/openapi-gui) | Node.js | GUI / visual editor for creating and editing OpenApi / Swagger definitions | -| swagger-editor | [GitHub/swagger-api](https://github.com/swagger-api/swagger-editor) | JavaScript | Web-Based editor for creating, editing, validating and testing OpenAPI\Swagger definitions | +| OpenAPI-gui | [github/Mermade/openapi-gui](https://github.com/Mermade/openapi-gui) | Node.js | GUI / visual editor for creating and editing OpenAPI definitions | +| SwaggerHub | [swaggerhub.com](https://swaggerhub.com) | | API Design and Documentation Platform, Built For Teams +| swagger-editor | [github/swagger-api](https://github.com/swagger-api/swagger-editor) | JavaScript | Web-Based editor for creating, editing, validating and testing OpenAPI\Swagger definitions | #### User Interfaces | Title | Project Link | Language |Description | |----------------|--------------|----------|---------------------| -| openapi-viewer | [GitHub/koumoul/openapi-viewer](https://github.com/koumoul-dev/openapi-viewer) | Vue.js | Browse and test a REST API described with the OpenAPI 3.0 Specification. | -| swagger-ui | [GitHub/swagger-api](https://github.com/swagger-api/swagger-UI) | JavaScript | Web-Based interface for visualizing and testing OpenAPI\Swagger definitions | -| lincoln | [GitHub/temando/open-api-renderer](https://github.com/temando/open-api-renderer)| React.js| A React renderer for Open API v3 | - +| openapi-viewer | [github/koumoul/openapi-viewer](https://github.com/koumoul-dev/openapi-viewer) | Vue.js | Browse and test a REST API described with the OpenAPI 3.0 Specification. | +| swagger-ui | [github/swagger-api](https://github.com/swagger-api/swagger-UI) | JavaScript | Web-Based interface for visualizing and testing OpenAPI\Swagger definitions | +| lincoln | [github/temando/open-api-renderer](https://github.com/temando/open-api-renderer)| React.js| A React renderer for OpenAPI v3 | +| WebSphere Liberty | [Download jar](https://developer.ibm.com/wasdev/downloads/) | JavaScript | Includes a native OpenAPI v3 UI which allows for customization of its banners and URL | +| Widdershins | [github/Mermade/widdershins](https://github.com/Mermade/widdershins) | Node.js | Generate Slate/Shins markdown from OpenAPI 3.0.x | +| angular-swagger-ui | [github/angular-swagger-ui](https://github.com/Orange-OpenSource/angular-swagger-ui) | AngularJS | An angularJS implementation of Swagger UI | #### Server Implementations - +| Title | Project Link | Language |Description | +|----------------|--------------|----------|---------------------| +| Vert.x Web API Contract | [github/vert-x3/vertx-web](http://vertx.io/docs/#web) | Java, Kotlin, JavaScript, Groovy, Ruby, Ceylon & Scala | Create an API endpoint with Vert.x 3 and OpenAPI 3 with automatic requests validation +| Fusio | [github/apioo/fusio](https://github.com/apioo/fusio) | PHP, JavaScript | Build API endpoints based on OpenAPI 3 +| Modern | [github/modern-project/modern-ruby](https://github.com/modern-project/modern-ruby) | Ruby | OpenAPI 3-based Rack framework with automatic OAS generation and requests/response validation #### Code Generators | Title | Project Link | Language |Description | |----------------|--------------|----------|---------------------| -| baucis-openapi3 | [Github/metadevpro/baucis-openapi3](https://github.com/metadevpro/baucis-openapi3) | Node.js | [Baucis.js](https://github.com/wprl/baucis) plugin for generating OpenAPI 3.0 compliant API contracts. | -| Google Gnostic | [GitHub/googleapis/gnostic](https://github.com/googleapis/gnostic) | Go | Compile OpenAPI descriptions into equivalent Protocol Buffer representations. | -| serverless-openapi-documentation | [GitHub/temando/serverless-openapi-documentation](https://github.com/temando/serverless-openapi-documentation) | Typescript | Serverless 1.0 plugin to generate OpenAPI V3 documentation from serverless configuration | +| baucis-openapi3 | [github/metadevpro/baucis-openapi3](https://github.com/metadevpro/baucis-openapi3) | Node.js | [Baucis.js](https://github.com/wprl/baucis) plugin for generating OpenAPI 3.0 compliant API contracts. | +| Google Gnostic | [github/googleapis/gnostic](https://github.com/googleapis/gnostic) | Go | Compile OpenAPI descriptions into equivalent Protocol Buffer representations. | +| serverless-openapi-documentation | [github/temando/serverless-openapi-documentation](https://github.com/temando/serverless-openapi-documentation) | Typescript | Serverless 1.0 plugin to generate OpenAPI V3 documentation from serverless configuration | +| zero-rails_openapi | [github/zhandao/zero-rails_openapi](https://github.com/zhandao/zero-rails_openapi) | Ruby | Provide concise DSL for generating the OpenAPI Specification 3 documentation file for Rails application | +| slush-vertx | [github/pmlopes/slush-vertx](https://github.com/pmlopes/slush-vertx) | Java, Kotlin & Groovy | Generate server skeleton for [Vert.x Web API Contract](http://vertx.io/docs/#web) and API Client based on [Vert.x 3 Web Client](http://vertx.io/docs/#web) +| WebSphere Liberty | [Download jar](https://developer.ibm.com/wasdev/downloads/) | Java EE | Generates OpenAPI v3 documentation from Java EE applications | +| swagger-node-codegen | [github/fmvilas/swagger-node-codegen](https://github.com/fmvilas/swagger-node-codegen) | Node.js | Generates a Node.js/express server, but also has a template engine for creating any templates needed. | diff --git a/MAINTAINERS.md b/MAINTAINERS.md new file mode 100644 index 0000000000..34421f2c62 --- /dev/null +++ b/MAINTAINERS.md @@ -0,0 +1,11 @@ +## Active +* Darrel Miller [@darrelmiller](https://github.com/darrelmiller) +* Jeremy Whitlock [@whitlockjc](https://github.com/whitlockjc) +* Marsh Gardiner [@earth2marsh](https://github.com/earth2marsh) +* Mike Ralphson [@MikeRalphson](https://github.com/MikeRalphson) +* Ron Ratovsky [@webron](https://github.com/webron) +* Uri Sarid [@usarid](https://github.com/usarid) + +## Emeritus +* Jason Harmon [@jharmn](https://github.com/jharmn) +* Tony Tam [@fehguy](https://github.com/fehguy) diff --git a/README.md b/README.md index f2f1f82cd4..c432ba4236 100644 --- a/README.md +++ b/README.md @@ -4,29 +4,27 @@ ![](https://avatars3.githubusercontent.com/u/16343502?v=3&s=200) -The OpenAPI Specification is a community driven, open specification within the [Open API Initiative](https://www.openapis.org/), a Linux Foundation Collaborative Project. +The OpenAPI Specification is a community-driven open specification within the [OpenAPI Initiative](https://www.openapis.org/), a Linux Foundation Collaborative Project. -The OpenAPI Specification (OAS) defines a standard, programming language-agnostic interface description for REST APIs, which allows both humans and computers to discover and understand the capabilities of a service without requiring access to source code, additional documentation, or inspection of network traffic. When properly defined via OpenAPI, a consumer can understand and interact with the remote service with a minimal amount of implementation logic. Similar to what interface descriptions have done for lower-level programming, the OpenAPI Specification removes guesswork in calling a service. +The OpenAPI Specification (OAS) defines a standard, programming language-agnostic interface description for [REST APIs](https://en.wikipedia.org/wiki/Representational_state_transfer), which allows both humans and computers to discover and understand the capabilities of a service without requiring access to source code, additional documentation, or inspection of network traffic. When properly defined via OpenAPI, a consumer can understand and interact with the remote service with a minimal amount of implementation logic. Similar to what interface descriptions have done for lower-level programming, the OpenAPI Specification removes guesswork in calling a service. -Use cases for machine-readable API definition documents include, but are not limited to, interactive documentation; code generation for documentation, clients, and servers; and automation of test cases. OpenAPI documents describe an API's services and are represented in either YAML or JSON formats. These documents may either be produced and served statically or be generated dynamically from an application. +Use cases for machine-readable API definition documents include, but are not limited to: interactive documentation; code generation for documentation, clients, and servers; and automation of test cases. OpenAPI documents describe an API's services and are represented in either YAML or JSON formats. These documents may either be produced and served statically or be generated dynamically from an application. -The OpenAPI Specification does not require rewriting existing APIs. It does not require binding any software to a service—the service being described may not even be owned by the creator of its description. It does, however, require the capabilities of the service be described in the structure of the OpenAPI Specification. Not all services can be described by OpenAPI—this specification is not intended to cover every possible style of REST APIs. The OpenAPI Specification does not mandate a specific development process such as design-first or code-first. It does facilitate either technique by establishing clear interactions with a REST API. +The OpenAPI Specification does not require rewriting existing APIs. It does not require binding any software to a service — the service being described may not even be owned by the creator of its description. It does, however, require the capabilities of the service be described in the structure of the OpenAPI Specification. Not all services can be described by OpenAPI — this specification is not intended to cover every possible style of REST APIs. The OpenAPI Specification does not mandate a specific development process such as design-first or code-first. It does facilitate either technique by establishing clear interactions with a REST API. -This GitHub project is the starting point for OpenAPI. -Here you will find the information you need about the OpenAPI Specification, simple examples of what it looks like, and some general information regarding the project. +This GitHub project is the starting point for OpenAPI. Here you will find the information you need about the OpenAPI Specification, simple examples of what it looks like, and some general information regarding the project. -## Current Version - 3.0 +## Current Version - 3.0.1 -The current version of the OpenAPI specification is [OpenAPI Specification 3.0](versions/3.0.0.md). +The current version of the OpenAPI specification is [OpenAPI Specification 3.0.1](versions/3.0.1.md). ### Future Versions -[3.0.1](https://github.com/OAI/OpenAPI-Specification/tree/v3.0.1) - The next PATCH version. Patch-level fixes (typos, clarifications, etc.) should be submitted against this branch. +[3.0.2](https://github.com/OAI/OpenAPI-Specification/tree/v3.0.2-dev) - The next PATCH version. Patch-level fixes (typos, clarifications, etc.) should be submitted against this branch. ### Previous Versions -This repository also contains the [OpenAPI Specification 2.0](versions/2.0.md), which is identical to the Swagger 2.0 specification before it was renamed to “OpenAPI Specification”, -as well as the Swagger 1.2 and Swagger 2.0 specifications. +This repository also contains the [OpenAPI Specification 2.0](versions/2.0.md), which is identical to the Swagger 2.0 specification before it was renamed to "OpenAPI Specification", as well as the Swagger 1.2 and Swagger 2.0 specifications. Each folder in this repository, such as [examples](examples) and [schemas](schemas), should contain folders pertaining to the current and previous versions of the specification. @@ -37,18 +35,19 @@ If you just want to see it work, check out the [list of current examples](exampl ## Tools and Libraries Looking to see how you can create your own OpenAPI definition, present it, or otherwise use it? Check out the growing -[list of 3.0 Implementations](IMPLEMENTATIONS.md). +[list of 3.0 implementations](IMPLEMENTATIONS.md). ## Participation The current process for development of the OpenAPI Specification is described in [Development Guidelines](DEVELOPMENT.md). -Development of the next version of the OpenAPI Specification is guided by the [Technical Developer Community](https://www.openapis.org/participate/how-to-contribute/governance#TDC). This group of committers bring their API expertise, incorporate feedback from the community, and expand the group of committers as appropriate. All development activity on the future specification will be performed as features and merged into this branch. Upon release of the future specification, this branch will be merged to master. +Development of the next version of the OpenAPI Specification is guided by the [Technical Steering Committee (TSC)](https://www.openapis.org/participate/how-to-contribute/governance#TDC). This group of committers bring their API expertise, incorporate feedback from the community, and expand the group of committers as appropriate. All development activity on the future specification will be performed as features and merged into this branch. Upon release of the future specification, this branch will be merged to master. -The Open API Initiative encourages participation from individuals and companies alike. -If you want to participate in the evolution of the OpenAPI Specification, consider taking the following actions: +The TSC holds weekly web conferences to review open pull requests and discuss open issues related to the evolving OpenAPI Specification. Participation in weekly calls and scheduled working sessions is open to the community. You can view the [TSC calendar online](https://openapi.groups.io/g/tsc/calendar), and import it to your calendar using the [iCal link](https://openapi.groups.io/g/tsc/ics/1105671/1995679554/feed.ics). -* Review the [current specification](versions/3.0.0.md). The human-readable markdown file _is the source of truth_ for the specification. +The Open API Initiative encourages participation from individuals and companies alike. If you want to participate in the evolution of the OpenAPI Specification, consider taking the following actions: + +* Review the [current specification](versions/3.0.1.md). The human-readable markdown file _is the source of truth_ for the specification. * Review the [development](DEVELOPMENT.md) process so you understand how the spec is evolving. * Check the [issues](https://github.com/OAI/OpenAPI-Specification/issues) and [pull requests](https://github.com/OAI/OpenAPI-Specification/pulls) to see if someone has already documented your idea or feedback on the specification. You can follow an existing conversation by adding a comment to the existing issue or PR. * Create an issue to describe a new concern. If possible, propose a solution. @@ -57,8 +56,6 @@ Not all feedback can be accommodated and there may be solid arguments for or aga ## License - See: [License (Apache-2.0)](https://github.com/OAI/OpenAPI-Specification/blob/master/LICENSE) - ![Analytics](https://ga-beacon.appspot.com/UA-831873-42/readme.md?pixel) diff --git a/examples/v2.0/json/petstore-expanded.json b/examples/v2.0/json/petstore-expanded.json index 0c59f9a48e..d5d8de8126 100644 --- a/examples/v2.0/json/petstore-expanded.json +++ b/examples/v2.0/json/petstore-expanded.json @@ -7,12 +7,12 @@ "termsOfService": "http://swagger.io/terms/", "contact": { "name": "Swagger API Team", - "email": "foo@example.com", - "url": "http://madskristensen.net" + "email": "apiteam@swagger.io", + "url": "http://swagger.io" }, "license": { - "name": "MIT", - "url": "http://github.com/gruntjs/grunt/blob/master/LICENSE-MIT" + "name": "Apache 2.0", + "url": "https://www.apache.org/licenses/LICENSE-2.0.html" } }, "host": "petstore.swagger.io", @@ -207,4 +207,4 @@ } } } -} \ No newline at end of file +} diff --git a/examples/v2.0/json/petstore-separate/spec/swagger.json b/examples/v2.0/json/petstore-separate/spec/swagger.json index 542b76fc2a..7276990020 100644 --- a/examples/v2.0/json/petstore-separate/spec/swagger.json +++ b/examples/v2.0/json/petstore-separate/spec/swagger.json @@ -4,18 +4,18 @@ "version": "1.0.0", "title": "Swagger Petstore", "description": "A sample API that uses a petstore as an example to demonstrate features in the swagger-2.0 specification", - "termsOfService": "http://helloreverb.com/terms/", + "termsOfService": "http://swagger.io/terms/", "contact": { - "name": "Wordnik API Team", - "email": "foo@example.com", - "url": "http://madskristensen.net" + "name": "Swagger API Team", + "email": "apiteam@swagger.io", + "url": "http://swagger.io" }, "license": { - "name": "MIT", - "url": "http://github.com/gruntjs/grunt/blob/master/LICENSE-MIT" + "name": "Apache 2.0", + "url": "https://www.apache.org/licenses/LICENSE-2.0.html" } }, - "host": "petstore.swagger.wordnik.com", + "host": "petstore.swagger.io", "basePath": "/api", "schemes": [ "http" @@ -143,4 +143,4 @@ } } } -} \ No newline at end of file +} diff --git a/examples/v2.0/json/petstore-with-external-docs.json b/examples/v2.0/json/petstore-with-external-docs.json index 4c5154c233..e9d3f7765d 100644 --- a/examples/v2.0/json/petstore-with-external-docs.json +++ b/examples/v2.0/json/petstore-with-external-docs.json @@ -11,8 +11,8 @@ "url": "http://swagger.io" }, "license": { - "name": "MIT", - "url": "http://github.com/gruntjs/grunt/blob/master/LICENSE-MIT" + "name": "Apache 2.0", + "url": "https://www.apache.org/licenses/LICENSE-2.0.html" } }, "externalDocs": { @@ -230,4 +230,4 @@ } } } -} \ No newline at end of file +} diff --git a/examples/v2.0/yaml/petstore-expanded.yaml b/examples/v2.0/yaml/petstore-expanded.yaml index 588759d91a..e415dae654 100644 --- a/examples/v2.0/yaml/petstore-expanded.yaml +++ b/examples/v2.0/yaml/petstore-expanded.yaml @@ -6,11 +6,11 @@ info: termsOfService: http://swagger.io/terms/ contact: name: Swagger API Team - email: foo@example.com - url: http://madskristensen.net + email: apiteam@swagger.io + url: http://swagger.io license: - name: MIT - url: http://github.com/gruntjs/grunt/blob/master/LICENSE-MIT + name: Apache 2.0 + url: https://www.apache.org/licenses/LICENSE-2.0.html host: petstore.swagger.io basePath: /api schemes: diff --git a/examples/v2.0/yaml/petstore-separate/spec/swagger.yaml b/examples/v2.0/yaml/petstore-separate/spec/swagger.yaml index 850527ebf6..b937b5022a 100644 --- a/examples/v2.0/yaml/petstore-separate/spec/swagger.yaml +++ b/examples/v2.0/yaml/petstore-separate/spec/swagger.yaml @@ -3,15 +3,15 @@ info: version: 1.0.0 title: Swagger Petstore description: A sample API that uses a petstore as an example to demonstrate features in the swagger-2.0 specification - termsOfService: http://helloreverb.com/terms/ + termsOfService: http://swagger.io/terms/ contact: - name: Wordnik API Team - email: foo@example.com - url: http://madskristensen.net + name: Swagger API Team + email: apiteam@swagger.io + url: http://swagger.io license: - name: MIT - url: http://github.com/gruntjs/grunt/blob/master/LICENSE-MIT -host: petstore.swagger.wordnik.com + name: Apache 2.0 + url: https://www.apache.org/licenses/LICENSE-2.0.html +host: petstore.swagger.io basePath: /api schemes: - http diff --git a/examples/v2.0/yaml/petstore-with-external-docs.yaml b/examples/v2.0/yaml/petstore-with-external-docs.yaml index 3db47ff362..792864fca0 100644 --- a/examples/v2.0/yaml/petstore-with-external-docs.yaml +++ b/examples/v2.0/yaml/petstore-with-external-docs.yaml @@ -10,8 +10,8 @@ email: "apiteam@swagger.io" url: "http://swagger.io" license: - name: "MIT" - url: "http://github.com/gruntjs/grunt/blob/master/LICENSE-MIT" + name: "Apache 2.0" + url: "https://www.apache.org/licenses/LICENSE-2.0.html" externalDocs: description: "find more info here" url: "https://swagger.io/about" diff --git a/examples/v2.0/yaml/petstore.yaml b/examples/v2.0/yaml/petstore.yaml index 790948cb93..4003794e83 100644 --- a/examples/v2.0/yaml/petstore.yaml +++ b/examples/v2.0/yaml/petstore.yaml @@ -28,7 +28,7 @@ paths: format: int32 responses: "200": - description: An paged array of pets + description: A paged array of pets headers: x-next: type: string diff --git a/examples/v3.0/callback-example.yaml b/examples/v3.0/callback-example.yaml index 56ab18e27d..1622bd06b1 100644 --- a/examples/v3.0/callback-example.yaml +++ b/examples/v3.0/callback-example.yaml @@ -1,4 +1,7 @@ -# ... +openapi: 3.0.0 +info: + title: Callback Example + version: 1.0.0 paths: /streams: post: diff --git a/examples/v3.0/petstore-expanded.yaml b/examples/v3.0/petstore-expanded.yaml index e8c0fe5ffd..d7533318c6 100644 --- a/examples/v3.0/petstore-expanded.yaml +++ b/examples/v3.0/petstore-expanded.yaml @@ -6,11 +6,11 @@ info: termsOfService: http://swagger.io/terms/ contact: name: Swagger API Team - email: foo@example.com - url: http://madskristensen.net + email: apiteam@swagger.io + url: http://swagger.io license: - name: MIT - url: http://github.com/gruntjs/grunt/blob/master/LICENSE-MIT + name: Apache 2.0 + url: https://www.apache.org/licenses/LICENSE-2.0.html servers: - url: http://petstore.swagger.io/api paths: diff --git a/examples/v3.0/uber.yaml b/examples/v3.0/uber.yaml deleted file mode 100644 index 8b94db300f..0000000000 --- a/examples/v3.0/uber.yaml +++ /dev/null @@ -1,297 +0,0 @@ -# this is an example of the Uber API -# as a demonstration of an API spec in YAML -openapi: "3.0.0" -info: - title: Uber API - description: Move your app forward with the Uber API - version: "1.0.0" -servers: - - url: https://api.uber.com/v1 -paths: - /products: - get: - summary: Product Types - description: The Products endpoint returns information about the Uber products offered at a given location. The response includes the display name and other details about each product, and lists the products in the proper display order. - parameters: - - name: latitude - in: query - description: Latitude component of location. - required: true - schema: - type: number - format: double - - name: longitude - in: query - description: Longitude component of location. - required: true - schema: - type: number - format: double - security: - - apikey: [] - tags: - - Products - responses: - '200': - description: An array of products - content: - application/json: - schema: - $ref: "#/components/schemas/ProductList" - default: - description: Unexpected error - content: - application/json: - schema: - $ref: "#/components/schemas/Error" - /estimates/price: - get: - summary: Price Estimates - description: The Price Estimates endpoint returns an estimated price range for each product offered at a given location. The price estimate is provided as a formatted string with the full price range and the localized currency symbol.

The response also includes low and high estimates, and the [ISO 4217](http://en.wikipedia.org/wiki/ISO_4217) currency code for situations requiring currency conversion. When surge is active for a particular product, its surge_multiplier will be greater than 1, but the price estimate already factors in this multiplier. - parameters: - - name: start_latitude - in: query - description: Latitude component of start location. - required: true - schema: - type: number - format: double - - name: start_longitude - in: query - description: Longitude component of start location. - required: true - schema: - type: number - format: double - - name: end_latitude - in: query - description: Latitude component of end location. - required: true - schema: - type: number - format: double - - name: end_longitude - in: query - description: Longitude component of end location. - required: true - schema: - type: number - format: double - tags: - - Estimates - responses: - '200': - description: An array of price estimates by product - content: - application/json: - schema: - type: array - items: - $ref: "#/components/schemas/PriceEstimate" - default: - description: Unexpected error - content: - application/json: - schema: - $ref: "#/components/schemas/Error" - /estimates/time: - get: - summary: Time Estimates - description: The Time Estimates endpoint returns ETAs for all products offered at a given location, with the responses expressed as integers in seconds. We recommend that this endpoint be called every minute to provide the most accurate, up-to-date ETAs. - parameters: - - name: start_latitude - in: query - description: Latitude component of start location. - required: true - schema: - type: number - format: double - - name: start_longitude - in: query - description: Longitude component of start location. - required: true - schema: - type: number - format: double - - name: customer_uuid - in: query - schema: - type: string - format: uuid - description: Unique customer identifier to be used for experience customization. - - name: product_id - in: query - schema: - type: string - description: Unique identifier representing a specific product for a given latitude & longitude. - tags: - - Estimates - responses: - '200': - description: An array of products - content: - application/json: - schema: - type: array - items: - $ref: "#/components/schemas/Product" - default: - description: Unexpected error - content: - application/json: - schema: - $ref: "#/components/schemas/Error" - /me: - get: - summary: User Profile - description: The User Profile endpoint returns information about the Uber user that has authorized with the application. - tags: - - User - responses: - '200': - description: Profile information for a user - content: - application/json: - schema: - $ref: "#/components/schemas/Profile" - default: - description: Unexpected error - content: - application/json: - schema: - $ref: "#/components/schemas/Error" - /history: - get: - summary: User Activity - description: The User Activity endpoint returns data about a user's lifetime activity with Uber. The response will include pickup locations and times, dropoff locations and times, the distance of past requests, and information about which products were requested.

The history array in the response will have a maximum length based on the limit parameter. The response value count may exceed limit, therefore subsequent API requests may be necessary. - parameters: - - name: offset - in: query - schema: - type: integer - format: int32 - description: Offset the list of returned results by this amount. Default is zero. - - name: limit - in: query - schema: - type: integer - format: int32 - description: Number of items to retrieve. Default is 5, maximum is 100. - tags: - - User - responses: - '200': - description: History information for the given user - content: - application/json: - schema: - $ref: "#/components/schemas/Activities" - default: - description: Unexpected error - content: - application/json: - schema: - $ref: "#/components/schemas/Error" -components: - securitySchemes: - apikey: - type: apiKey - name: server_token - in: query - schemas: - Product: - properties: - product_id: - type: string - description: Unique identifier representing a specific product for a given latitude & longitude. For example, uberX in San Francisco will have a different product_id than uberX in Los Angeles. - description: - type: string - description: Description of product. - display_name: - type: string - description: Display name of product. - capacity: - type: integer - description: Capacity of product. For example, 4 people. - image: - type: string - description: Image URL representing the product. - ProductList: - properties: - products: - description: Contains the list of products - type: array - items: - $ref: "#/components/schemas/Product" - PriceEstimate: - properties: - product_id: - type: string - description: Unique identifier representing a specific product for a given latitude & longitude. For example, uberX in San Francisco will have a different product_id than uberX in Los Angeles - currency_code: - type: string - description: "[ISO 4217](http://en.wikipedia.org/wiki/ISO_4217) currency code." - display_name: - type: string - description: Display name of product. - estimate: - type: string - description: Formatted string of estimate in local currency of the start location. Estimate could be a range, a single number (flat rate) or "Metered" for TAXI. - low_estimate: - type: number - description: Lower bound of the estimated price. - high_estimate: - type: number - description: Upper bound of the estimated price. - surge_multiplier: - type: number - description: Expected surge multiplier. Surge is active if surge_multiplier is greater than 1. Price estimate already factors in the surge multiplier. - Profile: - properties: - first_name: - type: string - description: First name of the Uber user. - last_name: - type: string - description: Last name of the Uber user. - email: - type: string - description: Email address of the Uber user - picture: - type: string - description: Image URL of the Uber user. - promo_code: - type: string - description: Promo code of the Uber user. - Activity: - properties: - uuid: - type: string - description: Unique identifier for the activity - Activities: - properties: - offset: - type: integer - format: int32 - description: Position in pagination. - limit: - type: integer - format: int32 - description: Number of items to retrieve (100 max). - count: - type: integer - format: int32 - description: Total number of items available. - history: - type: array - items: - $ref: "#/components/schemas/Activity" - Error: - properties: - code: - type: string - message: - type: string - fields: - type: string - diff --git a/examples/v3.0/uspto.yaml b/examples/v3.0/uspto.yaml new file mode 100644 index 0000000000..774ca526b6 --- /dev/null +++ b/examples/v3.0/uspto.yaml @@ -0,0 +1,210 @@ +openapi: 3.0.0 +servers: + - url: '{scheme}://developer.uspto.gov/ds-api' + variables: + scheme: + description: 'The Data Set API is accessible via https and http' + enum: + - 'https' + - 'http' + default: 'https' +info: + description: >- + The Data Set API (DSAPI) allows the public users to discover and search + USPTO exported data sets. This is a generic API that allows USPTO users to + make any CSV based data files searchable through API. With the help of GET + call, it returns the list of data fields that are searchable. With the help + of POST call, data can be fetched based on the filters on the field names. + Please note that POST call is used to search the actual data. The reason for + the POST call is that it allows users to specify any complex search criteria + without worry about the GET size limitations as well as encoding of the + input parameters. + version: 1.0.0 + title: USPTO Data Set API + contact: + name: Open Data Portal + url: 'https://developer.uspto.gov' + email: developer@uspto.gov +tags: + - name: metadata + description: Find out about the data sets + - name: search + description: Search a data set +paths: + /: + get: + tags: + - metadata + operationId: list-data-sets + summary: List available data sets + responses: + '200': + description: Returns a list of data sets + content: + application/json: + schema: + $ref: '#/components/schemas/dataSetList' + example: + { + "total": 2, + "apis": [ + { + "apiKey": "oa_citations", + "apiVersionNumber": "v1", + "apiUrl": "https://developer.uspto.gov/ds-api/oa_citations/v1/fields", + "apiDocumentationUrl": "https://developer.uspto.gov/ds-api-docs/index.html?url=https://developer.uspto.gov/ds-api/swagger/docs/oa_citations.json" + }, + { + "apiKey": "cancer_moonshot", + "apiVersionNumber": "v1", + "apiUrl": "https://developer.uspto.gov/ds-api/cancer_moonshot/v1/fields", + "apiDocumentationUrl": "https://developer.uspto.gov/ds-api-docs/index.html?url=https://developer.uspto.gov/ds-api/swagger/docs/cancer_moonshot.json" + } + ] + } + /{dataset}/{version}/fields: + get: + tags: + - metadata + summary: >- + Provides the general information about the API and the list of fields + that can be used to query the dataset. + description: >- + This GET API returns the list of all the searchable field names that are + in the oa_citations. Please see the 'fields' attribute which returns an + array of field names. Each field or a combination of fields can be + searched using the syntax options shown below. + operationId: list-searchable-fields + parameters: + - name: dataset + in: path + description: 'Name of the dataset. In this case, the default value is oa_citations' + required: true + schema: + type: string + default: oa_citations + - name: version + in: path + description: Version of the dataset. + required: true + schema: + type: string + default: v1 + responses: + '200': + description: >- + The dataset api for the given version is found and it is accessible + to consume. + content: + application/json: + schema: + type: string + '404': + description: >- + The combination of dataset name and version is not found in the + system or it is not published yet to be consumed by public. + content: + application/json: + schema: + type: string + /{dataset}/{version}/records: + post: + tags: + - search + summary: >- + Provides search capability for the data set with the given search + criteria. + description: >- + This API is based on Solr/Lucense Search. The data is indexed using + SOLR. This GET API returns the list of all the searchable field names + that are in the Solr Index. Please see the 'fields' attribute which + returns an array of field names. Each field or a combination of fields + can be searched using the Solr/Lucene Syntax. Please refer + https://lucene.apache.org/core/3_6_2/queryparsersyntax.html#Overview for + the query syntax. List of field names that are searchable can be + determined using above GET api. + operationId: perform-search + parameters: + - name: version + in: path + description: Version of the dataset. + required: true + schema: + type: string + default: v1 + - name: dataset + in: path + description: 'Name of the dataset. In this case, the default value is oa_citations' + required: true + schema: + type: string + default: oa_citations + responses: + '200': + description: successful operation + content: + application/json: + schema: + type: array + items: + type: object + additionalProperties: + type: object + '404': + description: No matching record found for the given criteria. + requestBody: + content: + application/x-www-form-urlencoded: + schema: + type: object + properties: + criteria: + description: >- + Uses Lucene Query Syntax in the format of + propertyName:value, propertyName:[num1 TO num2] and date + range format: propertyName:[yyyyMMdd TO yyyyMMdd]. In the + response please see the 'docs' element which has the list of + record objects. Each record structure would consist of all + the fields and their corresponding values. + type: string + default: '*:*' + start: + description: Starting record number. Default value is 0. + type: integer + default: 0 + rows: + description: >- + Specify number of rows to be returned. If you run the search + with default values, in the response you will see 'numFound' + attribute which will tell the number of records available in + the dataset. + type: integer + default: 100 + required: + - criteria +components: + schemas: + dataSetList: + type: object + properties: + total: + type: integer + apis: + type: array + items: + type: object + properties: + apiKey: + type: string + description: To be used as a dataset parameter value + apiVersionNumber: + type: string + description: To be used as a version parameter value + apiUrl: + type: string + format: uriref + description: "The URL describing the dataset's fields" + apiDocumentationUrl: + type: string + format: uriref + description: A URL to the API console for each API diff --git a/versions/3.0.1.md b/versions/3.0.1.md new file mode 100644 index 0000000000..0a8a834358 --- /dev/null +++ b/versions/3.0.1.md @@ -0,0 +1,3380 @@ +# OpenAPI Specification + +#### Version 3.0.1 + +The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [BCP 14](https://tools.ietf.org/html/bcp14) [RFC2119](https://tools.ietf.org/html/rfc2119) [RFC8174](https://tools.ietf.org/html/rfc8174) when, and only when, they appear in all capitals, as shown here. + +This document is licensed under [The Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0.html). + +## Introduction + +The OpenAPI Specification (OAS) defines a standard, language-agnostic interface to RESTful APIs which allows both humans and computers to discover and understand the capabilities of the service without access to source code, documentation, or through network traffic inspection. When properly defined, a consumer can understand and interact with the remote service with a minimal amount of implementation logic. + +An OpenAPI definition can then be used by documentation generation tools to display the API, code generation tools to generate servers and clients in various programming languages, testing tools, and many other use cases. + +## Table of Contents + + +- [Definitions](#definitions) + - [OpenAPI Document](#oasDocument) + - [Path Templating](#pathTemplating) + - [Media Types](#mediaTypes) + - [HTTP Status Codes](#httpCodes) +- [Specification](#specification) + - [Versions](#versions) + - [Format](#format) + - [Document Structure](#documentStructure) + - [Data Types](#dataTypes) + - [Rich Text Formatting](#richText) + - [Relative References In URLs](#relativeReferences) + - [Schema](#schema) + - [OpenAPI Object](#oasObject) + - [Info Object](#infoObject) + - [Contact Object](#contactObject) + - [License Object](#licenseObject) + - [Server Object](#serverObject) + - [Server Variable Object](#serverVariableObject) + - [Components Object](#componentsObject) + - [Paths Object](#pathsObject) + - [Path Item Object](#pathItemObject) + - [Operation Object](#operationObject) + - [External Documentation Object](#externalDocumentationObject) + - [Parameter Object](#parameterObject) + - [Request Body Object](#requestBodyObject) + - [Media Type Object](#mediaTypeObject) + - [Encoding Object](#encodingObject) + - [Responses Object](#responsesObject) + - [Response Object](#responseObject) + - [Callback Object](#callbackObject) + - [Example Object](#exampleObject) + - [Link Object](#linkObject) + - [Header Object](#headerObject) + - [Tag Object](#tagObject) + - [Reference Object](#referenceObject) + - [Schema Object](#schemaObject) + - [Discriminator Object](#discriminatorObject) + - [XML Object](#xmlObject) + - [Security Scheme Object](#securitySchemeObject) + - [OAuth Flows Object](#oauthFlowsObject) + - [OAuth Flow Object](#oauthFlowObject) + - [Security Requirement Object](#securityRequirementObject) + - [Specification Extensions](#specificationExtensions) + - [Security Filtering](#securityFiltering) +- [Appendix A: Revision History](#revisionHistory) + + + + +## Definitions + +##### OpenAPI Document +A document (or set of documents) that defines or describes an API. An OpenAPI definition uses and conforms to the OpenAPI Specification. + +##### Path Templating +Path templating refers to the usage of curly braces ({}) to mark a section of a URL path as replaceable using path parameters. + +##### Media Types +Media type definitions are spread across several resources. +The media type definitions SHOULD be in compliance with [RFC6838](https://tools.ietf.org/html/rfc6838). + +Some examples of possible media type definitions: +``` + text/plain; charset=utf-8 + application/json + application/vnd.github+json + application/vnd.github.v3+json + application/vnd.github.v3.raw+json + application/vnd.github.v3.text+json + application/vnd.github.v3.html+json + application/vnd.github.v3.full+json + application/vnd.github.v3.diff + application/vnd.github.v3.patch +``` +##### HTTP Status Codes +The HTTP Status Codes are used to indicate the status of the executed operation. +The available status codes are defined by [RFC7231](https://tools.ietf.org/html/rfc7231#section-6) and registered status codes are listed in the [IANA Status Code Registry](https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml). + +## Specification + +### Versions + +The OpenAPI Specification is versioned using [Semantic Versioning 2.0.0](https://semver.org/spec/v2.0.0.html) (semver) and follows the semver specification. + +The `major`.`minor` portion of the semver (for example `3.0`) SHALL designate the OAS feature set. Typically, *`.patch`* versions address errors in this document, not the feature set. Tooling which supports OAS 3.0 SHOULD be compatible with all OAS 3.0.\* versions. The patch version SHOULD NOT be considered by tooling, making no distinction between `3.0.0` and `3.0.1` for example. + +Subsequent minor version releases of the OpenAPI Specification (incrementing the `minor` version number) SHOULD NOT interfere with tooling developed to a lower minor version and same major version. Thus a hypothetical `3.1.0` specification SHOULD be usable with tooling designed for `3.0.0`. + +An OpenAPI document compatible with OAS 3.\*.\* contains a required [`openapi`](#oasVersion) field which designates the semantic version of the OAS that it uses. (OAS 2.0 documents contain a top-level version field named [`swagger`](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#swaggerObject) and value `"2.0"`.) + +### Format + +An OpenAPI document that conforms to the OpenAPI Specification is itself a JSON object, which may be represented either in JSON or YAML format. + +For example, if a field has an array value, the JSON array representation will be used: + +```json +{ + "field": [ 1, 2, 3 ] +} +``` +All field names in the specification are **case sensitive**. + +The schema exposes two types of fields: Fixed fields, which have a declared name, and Patterned fields, which declare a regex pattern for the field name. + +Patterned fields MUST have unique names within the containing object. + +In order to preserve the ability to round-trip between YAML and JSON formats, YAML version [1.2](http://www.yaml.org/spec/1.2/spec.html) is RECOMMENDED along with some additional constraints: + +- Tags MUST be limited to those allowed by the [JSON Schema ruleset](http://www.yaml.org/spec/1.2/spec.html#id2803231). +- Keys used in YAML maps MUST be limited to a scalar string, as defined by the [YAML Failsafe schema ruleset](http://yaml.org/spec/1.2/spec.html#id2802346). + +**Note:** While APIs may be defined by OpenAPI documents in either YAML or JSON format, the API request and response bodies and other content are not required to be JSON or YAML. + +### Document Structure + +An OpenAPI document MAY be made up of a single document or be divided into multiple, connected parts at the discretion of the user. In the latter case, `$ref` fields MUST be used in the specification to reference those parts as follows from the [JSON Schema](http://json-schema.org) definitions. + +It is RECOMMENDED that the root OpenAPI document be named: `openapi.json` or `openapi.yaml`. + +### Data Types + +Primitive data types in the OAS are based on the types supported by the [JSON Schema Specification Wright Draft 00](https://tools.ietf.org/html/draft-wright-json-schema-00#section-4.2). +Note that `integer` as a type is also supported and is defined as a JSON number without a fraction or exponent part. +`null` is not supported as a type (see [`nullable`](#schemaNullable) for an alternative solution). +Models are defined using the [Schema Object](#schemaObject), which is an extended subset of JSON Schema Specification Wright Draft 00. + +Primitives have an optional modifier property: `format`. +OAS uses several known formats to define in fine detail the data type being used. +However, to support documentation needs, the `format` property is an open `string`-valued property, and can have any value. +Formats such as `"email"`, `"uuid"`, and so on, MAY be used even though undefined by this specification. +Types that are not accompanied by a `format` property follow the type definition in the JSON Schema. Tools that do not recognize a specific `format` MAY default back to the `type` alone, as if the `format` is not specified. + +The formats defined by the OAS are: + +Common Name | [`type`](#dataTypes) | [`format`](#dataTypeFormat) | Comments +----------- | ------ | -------- | -------- +integer | `integer` | `int32` | signed 32 bits +long | `integer` | `int64` | signed 64 bits +float | `number` | `float` | | +double | `number` | `double` | | +string | `string` | | | +byte | `string` | `byte` | base64 encoded characters +binary | `string` | `binary` | any sequence of octets +boolean | `boolean` | | | +date | `string` | `date` | As defined by `full-date` - [RFC3339](https://xml2rfc.ietf.org/public/rfc/html/rfc3339.html#anchor14) +dateTime | `string` | `date-time` | As defined by `date-time` - [RFC3339](https://xml2rfc.ietf.org/public/rfc/html/rfc3339.html#anchor14) +password | `string` | `password` | A hint to UIs to obscure input. + +### Rich Text Formatting +Throughout the specification `description` fields are noted as supporting CommonMark markdown formatting. +Where OpenAPI tooling renders rich text it MUST support, at a minimum, markdown syntax as described by [CommonMark 0.27](http://spec.commonmark.org/0.27/). Tooling MAY choose to ignore some CommonMark features to address security concerns. + +### Relative References in URLs + +Unless specified otherwise, all properties that are URLs MAY be relative references as defined by [RFC3986](https://tools.ietf.org/html/rfc3986#section-4.2). +Relative references are resolved using the URLs defined in the [`Server Object`](#serverObject) as a Base URI. + +Relative references used in `$ref` are processed as per [JSON Reference](https://tools.ietf.org/html/draft-pbryan-zyp-json-ref-03), using the URL of the current document as the base URI. See also the [Reference Object](#referenceObject). + +### Schema + +In the following description, if a field is not explicitly **REQUIRED** or described with a MUST or SHALL, it can be considered OPTIONAL. + +#### OpenAPI Object + +This is the root document object of the [OpenAPI document](#oasDocument). + +##### Fixed Fields + +Field Name | Type | Description +---|:---:|--- +openapi | `string` | **REQUIRED**. This string MUST be the [semantic version number](https://semver.org/spec/v2.0.0.html) of the [OpenAPI Specification version](#versions) that the OpenAPI document uses. The `openapi` field SHOULD be used by tooling specifications and clients to interpret the OpenAPI document. This is *not* related to the API [`info.version`](#infoVersion) string. +info | [Info Object](#infoObject) | **REQUIRED**. Provides metadata about the API. The metadata MAY be used by tooling as required. +servers | [[Server Object](#serverObject)] | An array of Server Objects, which provide connectivity information to a target server. If the `servers` property is not provided, or is an empty array, the default value would be a [Server Object](#serverObject) with a [url](#serverUrl) value of `/`. +paths | [Paths Object](#pathsObject) | **REQUIRED**. The available paths and operations for the API. +components | [Components Object](#componentsObject) | An element to hold various schemas for the specification. +security | [[Security Requirement Object](#securityRequirementObject)] | A declaration of which security mechanisms can be used across the API. The list of values includes alternative security requirement objects that can be used. Only one of the security requirement objects need to be satisfied to authorize a request. Individual operations can override this definition. +tags | [[Tag Object](#tagObject)] | A list of tags used by the specification with additional metadata. The order of the tags can be used to reflect on their order by the parsing tools. Not all tags that are used by the [Operation Object](#operationObject) must be declared. The tags that are not declared MAY be organized randomly or based on the tools' logic. Each tag name in the list MUST be unique. +externalDocs | [External Documentation Object](#externalDocumentationObject) | Additional external documentation. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +#### Info Object + +The object provides metadata about the API. +The metadata MAY be used by the clients if needed, and MAY be presented in editing or documentation generation tools for convenience. + +##### Fixed Fields + +Field Name | Type | Description +---|:---:|--- +title | `string` | **REQUIRED**. The title of the application. +description | `string` | A short description of the application. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +termsOfService | `string` | A URL to the Terms of Service for the API. MUST be in the format of a URL. +contact | [Contact Object](#contactObject) | The contact information for the exposed API. +license | [License Object](#licenseObject) | The license information for the exposed API. +version | `string` | **REQUIRED**. The version of the OpenAPI document (which is distinct from the [OpenAPI Specification version](#oasVersion) or the API implementation version). + + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Info Object Example: + +```json +{ + "title": "Sample Pet Store App", + "description": "This is a sample server for a pet store.", + "termsOfService": "http://example.com/terms/", + "contact": { + "name": "API Support", + "url": "http://www.example.com/support", + "email": "support@example.com" + }, + "license": { + "name": "Apache 2.0", + "url": "https://www.apache.org/licenses/LICENSE-2.0.html" + }, + "version": "1.0.1" +} +``` + +```yaml +title: Sample Pet Store App +description: This is a sample server for a pet store. +termsOfService: http://example.com/terms/ +contact: + name: API Support + url: http://www.example.com/support + email: support@example.com +license: + name: Apache 2.0 + url: https://www.apache.org/licenses/LICENSE-2.0.html +version: 1.0.1 +``` + +#### Contact Object + +Contact information for the exposed API. + +##### Fixed Fields + +Field Name | Type | Description +---|:---:|--- +name | `string` | The identifying name of the contact person/organization. +url | `string` | The URL pointing to the contact information. MUST be in the format of a URL. +email | `string` | The email address of the contact person/organization. MUST be in the format of an email address. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Contact Object Example: + +```json +{ + "name": "API Support", + "url": "http://www.example.com/support", + "email": "support@example.com" +} +``` + +```yaml +name: API Support +url: http://www.example.com/support +email: support@example.com +``` + +#### License Object + +License information for the exposed API. + +##### Fixed Fields + +Field Name | Type | Description +---|:---:|--- +name | `string` | **REQUIRED**. The license name used for the API. +url | `string` | A URL to the license used for the API. MUST be in the format of a URL. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### License Object Example: + +```json +{ + "name": "Apache 2.0", + "url": "https://www.apache.org/licenses/LICENSE-2.0.html" +} +``` + +```yaml +name: Apache 2.0 +url: https://www.apache.org/licenses/LICENSE-2.0.html +``` + +#### Server Object + +An object representing a Server. + +##### Fixed Fields + +Field Name | Type | Description +---|:---:|--- +url | `string` | **REQUIRED**. A URL to the target host. This URL supports Server Variables and MAY be relative, to indicate that the host location is relative to the location where the OpenAPI document is being served. Variable substitutions will be made when a variable is named in `{`brackets`}`. +description | `string` | An optional string describing the host designated by the URL. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +variables | Map[`string`, [Server Variable Object](#serverVariableObject)] | A map between a variable name and its value. The value is used for substitution in the server's URL template. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Server Object Example + +A single server would be described as: + +```json +{ + "url": "https://development.gigantic-server.com/v1", + "description": "Development server" +} +``` + +```yaml +url: https://development.gigantic-server.com/v1 +description: Development server +``` + +The following shows how multiple servers can be described, for example, at the OpenAPI Object's [`servers`](#oasServers): + +```json +{ + "servers": [ + { + "url": "https://development.gigantic-server.com/v1", + "description": "Development server" + }, + { + "url": "https://staging.gigantic-server.com/v1", + "description": "Staging server" + }, + { + "url": "https://api.gigantic-server.com/v1", + "description": "Production server" + } + ] +} +``` + +```yaml +servers: +- url: https://development.gigantic-server.com/v1 + description: Development server +- url: https://staging.gigantic-server.com/v1 + description: Staging server +- url: https://api.gigantic-server.com/v1 + description: Production server +``` + +The following shows how variables can be used for a server configuration: + +```json +{ + "servers": [ + { + "url": "https://{username}.gigantic-server.com:{port}/{basePath}", + "description": "The production API server", + "variables": { + "username": { + "default": "demo", + "description": "this value is assigned by the service provider, in this example `gigantic-server.com`" + }, + "port": { + "enum": [ + "8443", + "443" + ], + "default": "8443" + }, + "basePath": { + "default": "v2" + } + } + } + ] +} +``` + +```yaml +servers: +- url: https://{username}.gigantic-server.com:{port}/{basePath} + description: The production API server + variables: + username: + # note! no enum here means it is an open value + default: demo + description: this value is assigned by the service provider, in this example `gigantic-server.com` + port: + enum: + - '8443' + - '443' + default: '8443' + basePath: + # open meaning there is the opportunity to use special base paths as assigned by the provider, default is `v2` + default: v2 +``` + + +#### Server Variable Object + +An object representing a Server Variable for server URL template substitution. + +##### Fixed Fields + +Field Name | Type | Description +---|:---:|--- +enum | [`string`] | An enumeration of string values to be used if the substitution options are from a limited set. +default | `string` | **REQUIRED**. The default value to use for substitution, and to send, if an alternate value is _not_ supplied. Unlike the [Schema Object's](#schemaObject) `default`, this value MUST be provided by the consumer. +description | `string` | An optional description for the server variable. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +#### Components Object + +Holds a set of reusable objects for different aspects of the OAS. +All objects defined within the components object will have no effect on the API unless they are explicitly referenced from properties outside the components object. + + +##### Fixed Fields + +Field Name | Type | Description +---|:---|--- + schemas | Map[`string`, [Schema Object](#schemaObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Schema Objects](#schemaObject). + responses | Map[`string`, [Response Object](#responseObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Response Objects](#responseObject). + parameters | Map[`string`, [Parameter Object](#parameterObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Parameter Objects](#parameterObject). + examples | Map[`string`, [Example Object](#exampleObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Example Objects](#exampleObject). + requestBodies | Map[`string`, [Request Body Object](#requestBodyObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Request Body Objects](#requestBodyObject). + headers | Map[`string`, [Header Object](#headerObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Header Objects](#headerObject). + securitySchemes| Map[`string`, [Security Scheme Object](#securitySchemeObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Security Scheme Objects](#securitySchemeObject). + links | Map[`string`, [Link Object](#linkObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Link Objects](#linkObject). + callbacks | Map[`string`, [Callback Object](#callbackObject) \| [Reference Object](#referenceObject)] | An object to hold reusable [Callback Objects](#callbackObject). + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +All the fixed fields declared above are objects that MUST use keys that match the regular expression: `^[a-zA-Z0-9\.\-_]+$`. + +Field Name Examples: + +``` +User +User_1 +User_Name +user-name +my.org.User +``` + +##### Components Object Example + +```json +"components": { + "schemas": { + "Category": { + "type": "object", + "properties": { + "id": { + "type": "integer", + "format": "int64" + }, + "name": { + "type": "string" + } + } + }, + "Tag": { + "type": "object", + "properties": { + "id": { + "type": "integer", + "format": "int64" + }, + "name": { + "type": "string" + } + } + } + }, + "parameters": { + "skipParam": { + "name": "skip", + "in": "query", + "description": "number of items to skip", + "required": true, + "schema": { + "type": "integer", + "format": "int32" + } + }, + "limitParam": { + "name": "limit", + "in": "query", + "description": "max records to return", + "required": true, + "schema" : { + "type": "integer", + "format": "int32" + } + } + }, + "responses": { + "NotFound": { + "description": "Entity not found." + }, + "IllegalInput": { + "description": "Illegal input for operation." + }, + "GeneralError": { + "description": "General Error", + "content": { + "application/json": { + "schema": { + "$ref": "#/components/schemas/GeneralError" + } + } + } + } + }, + "securitySchemes": { + "api_key": { + "type": "apiKey", + "name": "api_key", + "in": "header" + }, + "petstore_auth": { + "type": "oauth2", + "flows": { + "implicit": { + "authorizationUrl": "http://example.org/api/oauth/dialog", + "scopes": { + "write:pets": "modify pets in your account", + "read:pets": "read your pets" + } + } + } + } + } +} +``` + +```yaml +components: + schemas: + Category: + type: object + properties: + id: + type: integer + format: int64 + name: + type: string + Tag: + type: object + properties: + id: + type: integer + format: int64 + name: + type: string + parameters: + skipParam: + name: skip + in: query + description: number of items to skip + required: true + schema: + type: integer + format: int32 + limitParam: + name: limit + in: query + description: max records to return + required: true + schema: + type: integer + format: int32 + responses: + NotFound: + description: Entity not found. + IllegalInput: + description: Illegal input for operation. + GeneralError: + description: General Error + content: + application/json: + schema: + $ref: '#/components/schemas/GeneralError' + securitySchemes: + api_key: + type: apiKey + name: api_key + in: header + petstore_auth: + type: oauth2 + flows: + implicit: + authorizationUrl: http://example.org/api/oauth/dialog + scopes: + write:pets: modify pets in your account + read:pets: read your pets +``` + + +#### Paths Object + +Holds the relative paths to the individual endpoints and their operations. +The path is appended to the URL from the [`Server Object`](#serverObject) in order to construct the full URL. The Paths MAY be empty, due to [ACL constraints](#securityFiltering). + +##### Patterned Fields + +Field Pattern | Type | Description +---|:---:|--- +/{path} | [Path Item Object](#pathItemObject) | A relative path to an individual endpoint. The field name MUST begin with a slash. The path is **appended** (no relative URL resolution) to the expanded URL from the [`Server Object`](#serverObject)'s `url` field in order to construct the full URL. [Path templating](#pathTemplating) is allowed. When matching URLs, concrete (non-templated) paths would be matched before their templated counterparts. Templated paths with the same hierarchy but different templated names MUST NOT exist as they are identical. In case of ambiguous matching, it's up to the tooling to decide which one to use. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Path Templating Matching + +Assuming the following paths, the concrete definition, `/pets/mine`, will be matched first if used: + +``` + /pets/{petId} + /pets/mine +``` + +The following paths are considered identical and invalid: + +``` + /pets/{petId} + /pets/{name} +``` + +The following may lead to ambiguous resolution: + +``` + /{entity}/me + /books/{id} +``` + +##### Paths Object Example + +```json +{ + "/pets": { + "get": { + "description": "Returns all pets from the system that the user has access to", + "responses": { + "200": { + "description": "A list of pets.", + "content": { + "application/json": { + "schema": { + "type": "array", + "items": { + "$ref": "#/components/schemas/pet" + } + } + } + } + } + } + } + } +} +``` + +```yaml +/pets: + get: + description: Returns all pets from the system that the user has access to + responses: + '200': + description: A list of pets. + content: + application/json: + schema: + type: array + items: + $ref: '#/components/schemas/pet' +``` + +#### Path Item Object + +Describes the operations available on a single path. +A Path Item MAY be empty, due to [ACL constraints](#securityFiltering). +The path itself is still exposed to the documentation viewer but they will not know which operations and parameters are available. + +##### Fixed Fields + +Field Name | Type | Description +---|:---:|--- +$ref | `string` | Allows for an external definition of this path item. The referenced structure MUST be in the format of a [Path Item Object](#pathItemObject). If there are conflicts between the referenced definition and this Path Item's definition, the behavior is *undefined*. +summary| `string` | An optional, string summary, intended to apply to all operations in this path. +description | `string` | An optional, string description, intended to apply to all operations in this path. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +get | [Operation Object](#operationObject) | A definition of a GET operation on this path. +put | [Operation Object](#operationObject) | A definition of a PUT operation on this path. +post | [Operation Object](#operationObject) | A definition of a POST operation on this path. +delete | [Operation Object](#operationObject) | A definition of a DELETE operation on this path. +options | [Operation Object](#operationObject) | A definition of a OPTIONS operation on this path. +head | [Operation Object](#operationObject) | A definition of a HEAD operation on this path. +patch | [Operation Object](#operationObject) | A definition of a PATCH operation on this path. +trace | [Operation Object](#operationObject) | A definition of a TRACE operation on this path. +servers | [[Server Object](#serverObject)] | An alternative `server` array to service all operations in this path. +parameters | [[Parameter Object](#parameterObject) \| [Reference Object](#referenceObject)] | A list of parameters that are applicable for all the operations described under this path. These parameters can be overridden at the operation level, but cannot be removed there. The list MUST NOT include duplicated parameters. A unique parameter is defined by a combination of a [name](#parameterName) and [location](#parameterIn). The list can use the [Reference Object](#referenceObject) to link to parameters that are defined at the [OpenAPI Object's components/parameters](#componentsParameters). + + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Path Item Object Example + +```json +{ + "get": { + "description": "Returns pets based on ID", + "summary": "Find pets by ID", + "operationId": "getPetsById", + "responses": { + "200": { + "description": "pet response", + "content": { + "*/*": { + "schema": { + "type": "array", + "items": { + "$ref": "#/components/schemas/Pet" + } + } + } + } + }, + "default": { + "description": "error payload", + "content": { + "text/html": { + "schema": { + "$ref": "#/components/schemas/ErrorModel" + } + } + } + } + } + }, + "parameters": [ + { + "name": "id", + "in": "path", + "description": "ID of pet to use", + "required": true, + "schema": { + "type": "array", + "items": { + "type": "string" + } + }, + "style": "simple" + } + ] +} +``` + +```yaml +get: + description: Returns pets based on ID + summary: Find pets by ID + operationId: getPetsById + responses: + '200': + description: pet response + content: + '*/*' : + schema: + type: array + items: + $ref: '#/components/schemas/Pet' + default: + description: error payload + content: + 'text/html': + schema: + $ref: '#/components/schemas/ErrorModel' +parameters: +- name: id + in: path + description: ID of pet to use + required: true + schema: + type: array + style: simple + items: + type: string +``` + +#### Operation Object + +Describes a single API operation on a path. + +##### Fixed Fields + +Field Name | Type | Description +---|:---:|--- +tags | [`string`] | A list of tags for API documentation control. Tags can be used for logical grouping of operations by resources or any other qualifier. +summary | `string` | A short summary of what the operation does. +description | `string` | A verbose explanation of the operation behavior. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +externalDocs | [External Documentation Object](#externalDocumentationObject) | Additional external documentation for this operation. +operationId | `string` | Unique string used to identify the operation. The id MUST be unique among all operations described in the API. Tools and libraries MAY use the operationId to uniquely identify an operation, therefore, it is RECOMMENDED to follow common programming naming conventions. +parameters | [[Parameter Object](#parameterObject) \| [Reference Object](#referenceObject)] | A list of parameters that are applicable for this operation. If a parameter is already defined at the [Path Item](#pathItemParameters), the new definition will override it but can never remove it. The list MUST NOT include duplicated parameters. A unique parameter is defined by a combination of a [name](#parameterName) and [location](#parameterIn). The list can use the [Reference Object](#referenceObject) to link to parameters that are defined at the [OpenAPI Object's components/parameters](#componentsParameters). +requestBody | [Request Body Object](#requestBodyObject) \| [Reference Object](#referenceObject) | The request body applicable for this operation. The `requestBody` is only supported in HTTP methods where the HTTP 1.1 specification [RFC7231](https://tools.ietf.org/html/rfc7231#section-4.3.1) has explicitly defined semantics for request bodies. In other cases where the HTTP spec is vague, `requestBody` SHALL be ignored by consumers. +responses | [Responses Object](#responsesObject) | **REQUIRED**. The list of possible responses as they are returned from executing this operation. +callbacks | Map[`string`, [Callback Object](#callbackObject) \| [Reference Object](#referenceObject)] | A map of possible out-of band callbacks related to the parent operation. The key is a unique identifier for the Callback Object. Each value in the map is a [Callback Object](#callbackObject) that describes a request that may be initiated by the API provider and the expected responses. The key value used to identify the callback object is an expression, evaluated at runtime, that identifies a URL to use for the callback operation. +deprecated | `boolean` | Declares this operation to be deprecated. Consumers SHOULD refrain from usage of the declared operation. Default value is `false`. +security | [[Security Requirement Object](#securityRequirementObject)] | A declaration of which security mechanisms can be used for this operation. The list of values includes alternative security requirement objects that can be used. Only one of the security requirement objects need to be satisfied to authorize a request. This definition overrides any declared top-level [`security`](#oasSecurity). To remove a top-level security declaration, an empty array can be used. +servers | [[Server Object](#serverObject)] | An alternative `server` array to service this operation. If an alternative `server` object is specified at the Path Item Object or Root level, it will be overridden by this value. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Operation Object Example + +```json +{ + "tags": [ + "pet" + ], + "summary": "Updates a pet in the store with form data", + "operationId": "updatePetWithForm", + "parameters": [ + { + "name": "petId", + "in": "path", + "description": "ID of pet that needs to be updated", + "required": true, + "schema": { + "type": "string" + } + } + ], + "requestBody": { + "content": { + "application/x-www-form-urlencoded": { + "schema": { + "type": "object", + "properties": { + "name": { + "description": "Updated name of the pet", + "type": "string" + }, + "status": { + "description": "Updated status of the pet", + "type": "string" + } + }, + "required": ["status"] + } + } + } + }, + "responses": { + "200": { + "description": "Pet updated.", + "content": { + "application/json": {}, + "application/xml": {} + } + }, + "405": { + "description": "Invalid input", + "content": { + "application/json": {}, + "application/xml": {} + } + } + }, + "security": [ + { + "petstore_auth": [ + "write:pets", + "read:pets" + ] + } + ] +} +``` + +```yaml +tags: +- pet +summary: Updates a pet in the store with form data +operationId: updatePetWithForm +parameters: +- name: petId + in: path + description: ID of pet that needs to be updated + required: true + schema: + type: string +requestBody: + content: + 'application/x-www-form-urlencoded': + schema: + properties: + name: + description: Updated name of the pet + type: string + status: + description: Updated status of the pet + type: string + required: + - status +responses: + '200': + description: Pet updated. + content: + 'application/json': {} + 'application/xml': {} + '405': + description: Invalid input + content: + 'application/json': {} + 'application/xml': {} +security: +- petstore_auth: + - write:pets + - read:pets +``` + + +#### External Documentation Object + +Allows referencing an external resource for extended documentation. + +##### Fixed Fields + +Field Name | Type | Description +---|:---:|--- +description | `string` | A short description of the target documentation. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +url | `string` | **REQUIRED**. The URL for the target documentation. Value MUST be in the format of a URL. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### External Documentation Object Example + +```json +{ + "description": "Find more info here", + "url": "https://example.com" +} +``` + +```yaml +description: Find more info here +url: https://example.com +``` + +#### Parameter Object + +Describes a single operation parameter. + +A unique parameter is defined by a combination of a [name](#parameterName) and [location](#parameterIn). + +##### Parameter Locations +There are four possible parameter locations specified by the `in` field: +* path - Used together with [Path Templating](#pathTemplating), where the parameter value is actually part of the operation's URL. This does not include the host or base path of the API. For example, in `/items/{itemId}`, the path parameter is `itemId`. +* query - Parameters that are appended to the URL. For example, in `/items?id=###`, the query parameter is `id`. +* header - Custom headers that are expected as part of the request. Note that [RFC7230](https://tools.ietf.org/html/rfc7230#page-22) states header names are case insensitive. +* cookie - Used to pass a specific cookie value to the API. + + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +name | `string` | **REQUIRED**. The name of the parameter. Parameter names are *case sensitive*. +in | `string` | **REQUIRED**. The location of the parameter. Possible values are "query", "header", "path" or "cookie". +description | `string` | A brief description of the parameter. This could contain examples of use. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +required | `boolean` | Determines whether this parameter is mandatory. If the [parameter location](#parameterIn) is "path", this property is **REQUIRED** and its value MUST be `true`. Otherwise, the property MAY be included and its default value is `false`. + deprecated | `boolean` | Specifies that a parameter is deprecated and SHOULD be transitioned out of usage. + allowEmptyValue | `boolean` | Sets the ability to pass empty-valued parameters. This is valid only for `query` parameters and allows sending a parameter with an empty value. Default value is `false`. If [`style`](#parameterStyle) is used, and if behavior is `n/a` (cannot be serialized), the value of `allowEmptyValue` SHALL be ignored. + +The rules for serialization of the parameter are specified in one of two ways. +For simpler scenarios, a [`schema`](#parameterSchema) and [`style`](#parameterStyle) can describe the structure and syntax of the parameter. + +Field Name | Type | Description +---|:---:|--- +style | `string` | Describes how the parameter value will be serialized depending on the type of the parameter value. Default values (based on value of `in`): for `query` - `form`; for `path` - `simple`; for `header` - `simple`; for `cookie` - `form`. +explode | `boolean` | When this is true, parameter values of type `array` or `object` generate separate parameters for each value of the array or key-value pair of the map. For other types of parameters this property has no effect. When [`style`](#parameterStyle) is `form`, the default value is `true`. For all other styles, the default value is `false`. +allowReserved | `boolean` | Determines whether the parameter value SHOULD allow reserved characters, as defined by [RFC3986](https://tools.ietf.org/html/rfc3986#section-2.2) `:/?#[]@!$&'()*+,;=` to be included without percent-encoding. This property only applies to parameters with an `in` value of `query`. The default value is `false`. +schema | [Schema Object](#schemaObject) \| [Reference Object](#referenceObject) | The schema defining the type used for the parameter. +example | Any | Example of the media type. The example SHOULD match the specified schema and encoding properties if present. The `example` field is mutually exclusive of the `examples` field. Furthermore, if referencing a `schema` which contains an example, the `example` value SHALL _override_ the example provided by the schema. To represent examples of media types that cannot naturally be represented in JSON or YAML, a string value can contain the example with escaping where necessary. +examples | Map[ `string`, [Example Object](#exampleObject) \| [Reference Object](#referenceObject)] | Examples of the media type. Each example SHOULD contain a value in the correct format as specified in the parameter encoding. The `examples` field is mutually exclusive of the `example` field. Furthermore, if referencing a `schema` which contains an example, the `examples` value SHALL _override_ the example provided by the schema. + +For more complex scenarios, the [`content`](#parameterContent) property can define the media type and schema of the parameter. +A parameter MUST contain either a `schema` property, or a `content` property, but not both. +When `example` or `examples` are provided in conjunction with the `schema` object, the example MUST follow the prescribed serialization strategy for the parameter. + + +Field Name | Type | Description +---|:---:|--- +content | Map[`string`, [Media Type Object](#mediaTypeObject)] | A map containing the representations for the parameter. The key is the media type and the value describes it. The map MUST only contain one entry. + +##### Style Values + +In order to support common ways of serializing simple parameters, a set of `style` values are defined. + +`style` | [`type`](#dataTypes) | `in` | Comments +----------- | ------ | -------- | -------- +matrix | `primitive`, `array`, `object` | `path` | Path-style parameters defined by [RFC6570](https://tools.ietf.org/html/rfc6570#section-3.2.7) +label | `primitive`, `array`, `object` | `path` | Label style parameters defined by [RFC6570](https://tools.ietf.org/html/rfc6570#section-3.2.5) +form | `primitive`, `array`, `object` | `query`, `cookie` | Form style parameters defined by [RFC6570](https://tools.ietf.org/html/rfc6570#section-3.2.8). This option replaces `collectionFormat` with a `csv` (when `explode` is false) or `multi` (when `explode` is true) value from OpenAPI 2.0. +simple | `array` | `path`, `header` | Simple style parameters defined by [RFC6570](https://tools.ietf.org/html/rfc6570#section-3.2.2). This option replaces `collectionFormat` with a `csv` value from OpenAPI 2.0. +spaceDelimited | `array` | `query` | Space separated array values. This option replaces `collectionFormat` equal to `ssv` from OpenAPI 2.0. +pipeDelimited | `array` | `query` | Pipe separated array values. This option replaces `collectionFormat` equal to `pipes` from OpenAPI 2.0. +deepObject | `object` | `query` | Provides a simple way of rendering nested objects using form parameters. + + +##### Style Examples + +Assume a parameter named `color` has one of the following values: + +``` + string -> "blue" + array -> ["blue","black","brown"] + object -> { "R": 100, "G": 200, "B": 150 } +``` +The following table shows examples of rendering differences for each value. + +[`style`](#dataTypeFormat) | `explode` | `empty` | `string` | `array` | `object` +----------- | ------ | -------- | -------- | --------|------- +matrix | false | ;color | ;color=blue | ;color=blue,black,brown | ;color=R,100,G,200,B,150 +matrix | true | ;color | ;color=blue | ;color=blue;color=black;color=brown | ;R=100;G=200;B=150 +label | false | . | .blue | .blue.black.brown | .R.100.G.200.B.150 +label | true | . | .blue | .blue.black.brown | .R=100.G=200.B=150 +form | false | color= | color=blue | color=blue,black,brown | color=R,100,G,200,B,150 +form | true | color= | color=blue | color=blue&color=black&color=brown | R=100&G=200&B=150 +simple | false | n/a | blue | blue,black,brown | R,100,G,200,B,150 +simple | true | n/a | blue | blue,black,brown | R=100,G=200,B=150 +spaceDelimited | false | n/a | n/a | blue%20black%20brown | R%20100%20G%20200%20B%20150 +pipeDelimited | false | n/a | n/a | blue\|black\|brown | R\|100\|G\|200|G\|150 +deepObject | true | n/a | n/a | n/a | color[R]=100&color[G]=200&color[B]=150 + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Parameter Object Examples + +A header parameter with an array of 64 bit integer numbers: + +```json +{ + "name": "token", + "in": "header", + "description": "token to be passed as a header", + "required": true, + "schema": { + "type": "array", + "items": { + "type": "integer", + "format": "int64" + } + }, + "style": "simple" +} +``` + +```yaml +name: token +in: header +description: token to be passed as a header +required: true +schema: + type: array + items: + type: integer + format: int64 +style: simple +``` + +A path parameter of a string value: +```json +{ + "name": "username", + "in": "path", + "description": "username to fetch", + "required": true, + "schema": { + "type": "string" + } +} +``` + +```yaml +name: username +in: path +description: username to fetch +required: true +schema: + type: string +``` + +An optional query parameter of a string value, allowing multiple values by repeating the query parameter: +```json +{ + "name": "id", + "in": "query", + "description": "ID of the object to fetch", + "required": false, + "schema": { + "type": "array", + "items": { + "type": "string" + } + }, + "style": "form", + "explode": true +} +``` + +```yaml +name: id +in: query +description: ID of the object to fetch +required: false +schema: + type: array + items: + type: string +style: form +explode: true +``` + +A free-form query parameter, allowing undefined parameters of a specific type: +```json +{ + "in": "query", + "name": "freeForm", + "schema": { + "type": "object", + "additionalProperties": { + "type": "integer" + }, + }, + "style": "form" +} +``` + +```yaml +in: query +name: freeForm +schema: + type: object + additionalProperties: + type: integer +style: form +``` + +A complex parameter using `content` to define serialization: + +```json +{ + "in": "query", + "name": "coordinates", + "content": { + "application/json": { + "schema": { + "type": "object", + "required": [ + "lat", + "long" + ], + "properties": { + "lat": { + "type": "number" + }, + "long": { + "type": "number" + } + } + } + } + } +} +``` + +```yaml +in: query +name: coordinates +content: + application/json: + schema: + type: object + required: + - lat + - long + properties: + lat: + type: number + long: + type: number +``` + +#### Request Body Object + +Describes a single request body. + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +description | `string` | A brief description of the request body. This could contain examples of use. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +content | Map[`string`, [Media Type Object](#mediaTypeObject)] | **REQUIRED**. The content of the request body. The key is a media type or [media type range](https://tools.ietf.org/html/rfc7231#appendix-D) and the value describes it. For requests that match multiple keys, only the most specific key is applicable. e.g. text/plain overrides text/* +required | `boolean` | Determines if the request body is required in the request. Defaults to `false`. + + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Request Body Examples + +A request body with a referenced model definition. +```json +{ + "description": "user to add to the system", + "content": { + "application/json": { + "schema": { + "$ref": "#/components/schemas/User" + }, + "examples": { + "user" : { + "summary": "User Example", + "externalValue": "http://foo.bar/examples/user-example.json" + } + } + }, + "application/xml": { + "schema": { + "$ref": "#/components/schemas/User" + }, + "examples": { + "user" : { + "summary": "User example in XML", + "externalValue": "http://foo.bar/examples/user-example.xml" + } + } + }, + "text/plain": { + "examples": { + "user" : { + "summary": "User example in Plain text", + "externalValue": "http://foo.bar/examples/user-example.txt" + } + } + }, + "*/*": { + "examples": { + "user" : { + "summary": "User example in other format", + "externalValue": "http://foo.bar/examples/user-example.whatever" + } + } + } + } +} +``` + +```yaml +description: user to add to the system +content: + 'application/json': + schema: + $ref: '#/components/schemas/User' + examples: + user: + summary: User Example + externalValue: 'http://foo.bar/examples/user-example.json' + 'application/xml': + schema: + $ref: '#/components/schemas/User' + examples: + user: + summary: User Example in XML + externalValue: 'http://foo.bar/examples/user-example.xml' + 'text/plain': + examples: + user: + summary: User example in text plain format + externalValue: 'http://foo.bar/examples/user-example.txt' + '*/*': + examples: + user: + summary: User example in other format + externalValue: 'http://foo.bar/examples/user-example.whatever' +``` + +A body parameter that is an array of string values: +```json +{ + "description": "user to add to the system", + "content": { + "text/plain": { + "schema": { + "type": "array", + "items": { + "type": "string" + } + } + } + } +} +``` + +```yaml +description: user to add to the system +required: true +content: + text/plain: + schema: + type: array + items: + type: string +``` + + +#### Media Type Object +Each Media Type Object provides schema and examples for the media type identified by its key. + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +schema | [Schema Object](#schemaObject) \| [Reference Object](#referenceObject) | The schema defining the type used for the request body. +example | Any | Example of the media type. The example object SHOULD be in the correct format as specified by the media type. The `example` field is mutually exclusive of the `examples` field. Furthermore, if referencing a `schema` which contains an example, the `example` value SHALL _override_ the example provided by the schema. +examples | Map[ `string`, [Example Object](#exampleObject) \| [Reference Object](#referenceObject)] | Examples of the media type. Each example object SHOULD match the media type and specified schema if present. The `examples` field is mutually exclusive of the `example` field. Furthermore, if referencing a `schema` which contains an example, the `examples` value SHALL _override_ the example provided by the schema. +encoding | Map[`string`, [Encoding Object](#encodingObject)] | A map between a property name and its encoding information. The key, being the property name, MUST exist in the schema as a property. The encoding object SHALL only apply to `requestBody` objects when the media type is `multipart` or `application/x-www-form-urlencoded`. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Media Type Examples + +```js +{ + "application/json": { + "schema": { + "$ref": "#/components/schemas/Pet" + }, + "examples": { + "cat" : { + "summary": "An example of a cat", + "value": + { + "name": "Fluffy", + "petType": "Cat", + "color": "White", + "gender": "male", + "breed": "Persian" + } + }, + "dog": { + "summary": "An example of a dog with a cat's name", + "value" : { + "name": "Puma", + "petType": "Dog", + "color": "Black", + "gender": "Female", + "breed": "Mixed" + }, + "frog": { + "$ref": "#/components/examples/frog-example" + } + } + } + } +} +``` + +```yaml +application/json: + schema: + $ref: "#/components/schemas/Pet" + examples: + cat: + summary: An example of a cat + value: + name: Fluffy + petType: Cat + color: White + gender: male + breed: Persian + dog: + summary: An example of a dog with a cat's name + value: + name: Puma + petType: Dog + color: Black + gender: Female + breed: Mixed + frog: + $ref: "#/components/examples/frog-example" +``` + +##### Considerations for File Uploads + +In contrast with the 2.0 specification, `file` input/output content in OpenAPI is described with the same semantics as any other schema type. Specifically: + +```yaml +# content transferred with base64 encoding +schema: + type: string + format: base64 +``` + +```yaml +# content transferred in binary (octet-stream): +schema: + type: string + format: binary +``` + +These examples apply to either input payloads of file uploads or response payloads. + +A `requestBody` for submitting a file in a `POST` operation may look like the following example: + +```yaml +requestBody: + content: + application/octet-stream: + # any media type is accepted, functionally equivalent to `*/*` + schema: + # a binary file of any type + type: string + format: binary +``` + +In addition, specific media types MAY be specified: + +```yaml +# multiple, specific media types may be specified: +requestBody: + content: + # a binary file of type png or jpeg + 'image/jpeg': + schema: + type: string + format: binary + 'image/png': + schema: + type: string + format: binary +``` + +To upload multiple files, a `multipart` media type MUST be used: + +```yaml +requestBody: + content: + multipart/form-data: + schema: + properties: + # The property name 'file' will be used for all files. + file: + type: array + items: + type: string + format: binary + +``` + +##### Support for x-www-form-urlencoded Request Bodies + +To submit content using form url encoding via [RFC1866](https://tools.ietf.org/html/rfc1866), the following +definition may be used: + +```yaml +requestBody: + content: + application/x-www-form-urlencoded: + schema: + type: object + properties: + id: + type: string + format: uuid + address: + # complex types are stringified to support RFC 1866 + type: object + properties: {} +``` + +In this example, the contents in the `requestBody` MUST be stringified per [RFC1866](https://tools.ietf.org/html/rfc1866/) when passed to the server. In addition, the `address` field complex object will be stringified. + +When passing complex objects in the `application/x-www-form-urlencoded` content type, the default serialization strategy of such properties is described in the [`Encoding Object`](#encodingObject)'s [`style`](#encodingStyle) property as `form`. + +##### Special Considerations for `multipart` Content + +It is common to use `multipart/form-data` as a `Content-Type` when transferring request bodies to operations. In contrast to 2.0, a `schema` is REQUIRED to define the input parameters to the operation when using `multipart` content. This supports complex structures as well as supporting mechanisms for multiple file uploads. + +When passing in `multipart` types, boundaries MAY be used to separate sections of the content being transferred — thus, the following default `Content-Type`s are defined for `multipart`: + +* If the property is a primitive, or an array of primitive values, the default Content-Type is `text/plain` +* If the property is complex, or an array of complex values, the default Content-Type is `application/json` +* If the property is a `type: string` with `format: binary` or `format: base64` (aka a file object), the default Content-Type is `application/octet-stream` + + +Examples: + +```yaml +requestBody: + content: + multipart/form-data: + schema: + type: object + properties: + id: + type: string + format: uuid + address: + # default Content-Type for objects is `application/json` + type: object + properties: {} + profileImage: + # default Content-Type for string/binary is `application/octet-stream` + type: string + format: binary + children: + # default Content-Type for arrays is based on the `inner` type (text/plain here) + type: array + items: + type: string + addresses: + # default Content-Type for arrays is based on the `inner` type (object shown, so `application/json` in this example) + type: array + items: + type: '#/components/schemas/Address' +``` + +An `encoding` attribute is introduced to give you control over the serialization of parts of `multipart` request bodies. This attribute is _only_ applicable to `multipart` and `application/x-www-form-urlencoded` request bodies. + +#### Encoding Object + +A single encoding definition applied to a single schema property. + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +contentType | `string` | The Content-Type for encoding a specific property. Default value depends on the property type: for `string` with `format` being `binary` – `application/octet-stream`; for other primitive types – `text/plain`; for `object` - `application/json`; for `array` – the default is defined based on the inner type. The value can be a specific media type (e.g. `application/json`), a wildcard media type (e.g. `image/*`), or a comma-separated list of the two types. +headers | Map[`string`, [Header Object](#headerObject) \| [Reference Object](#referenceObject)] | A map allowing additional information to be provided as headers, for example `Content-Disposition`. `Content-Type` is described separately and SHALL be ignored in this section. This property SHALL be ignored if the request body media type is not a `multipart`. +style | `string` | Describes how a specific property value will be serialized depending on its type. See [Parameter Object](#parameterObject) for details on the [`style`](#parameterStyle) property. The behavior follows the same values as `query` parameters, including default values. This property SHALL be ignored if the request body media type is not `application/x-www-form-urlencoded`. +explode | `boolean` | When this is true, property values of type `array` or `object` generate separate parameters for each value of the array, or key-value-pair of the map. For other types of properties this property has no effect. When [`style`](#encodingStyle) is `form`, the default value is `true`. For all other styles, the default value is `false`. This property SHALL be ignored if the request body media type is not `application/x-www-form-urlencoded`. +allowReserved | `boolean` | Determines whether the parameter value SHOULD allow reserved characters, as defined by [RFC3986](https://tools.ietf.org/html/rfc3986#section-2.2) `:/?#[]@!$&'()*+,;=` to be included without percent-encoding. The default value is `false`. This property SHALL be ignored if the request body media type is not `application/x-www-form-urlencoded`. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Encoding Object Example + +```yaml +requestBody: + content: + multipart/mixed: + schema: + type: object + properties: + id: + # default is text/plain + type: string + format: uuid + address: + # default is application/json + type: object + properties: {} + historyMetadata: + # need to declare XML format! + description: metadata in XML format + type: object + properties: {} + profileImage: + # default is application/octet-stream, need to declare an image type only! + type: string + format: binary + encoding: + historyMetadata: + # require XML Content-Type in utf-8 encoding + contentType: application/xml; charset=utf-8 + profileImage: + # only accept png/jpeg + contentType: image/png, image/jpeg + headers: + X-Rate-Limit-Limit: + description: The number of allowed requests in the current period + schema: + type: integer +``` + +#### Responses Object + +A container for the expected responses of an operation. +The container maps a HTTP response code to the expected response. + +The documentation is not necessarily expected to cover all possible HTTP response codes because they may not be known in advance. +However, documentation is expected to cover a successful operation response and any known errors. + +The `default` MAY be used as a default response object for all HTTP codes +that are not covered individually by the specification. + +The `Responses Object` MUST contain at least one response code, and it +SHOULD be the response for a successful operation call. + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +default | [Response Object](#responseObject) \| [Reference Object](#referenceObject) | The documentation of responses other than the ones declared for specific HTTP response codes. Use this field to cover undeclared responses. A [Reference Object](#referenceObject) can link to a response that the [OpenAPI Object's components/responses](#componentsResponses) section defines. + +##### Patterned Fields +Field Pattern | Type | Description +---|:---:|--- +[HTTP Status Code](#httpCodes) | [Response Object](#responseObject) \| [Reference Object](#referenceObject) | Any [HTTP status code](#httpCodes) can be used as the property name, but only one property per code, to describe the expected response for that HTTP status code. A [Reference Object](#referenceObject) can link to a response that is defined in the [OpenAPI Object's components/responses](#componentsResponses) section. This field MUST be enclosed in quotation marks (for example, "200") for compatibility between JSON and YAML. To define a range of response codes, this field MAY contain the uppercase wildcard character `X`. For example, `2XX` represents all response codes between `[200-299]`. The following range definitions are allowed: `1XX`, `2XX`, `3XX`, `4XX`, and `5XX`. If a response range is defined using an explicit code, the explicit code definition takes precedence over the range definition for that code. + + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Responses Object Example + +A 200 response for a successful operation and a default response for others (implying an error): + +```json +{ + "200": { + "description": "a pet to be returned", + "content": { + "application/json": { + "schema": { + "$ref": "#/components/schemas/Pet" + } + } + } + }, + "default": { + "description": "Unexpected error", + "content": { + "application/json": { + "schema": { + "$ref": "#/components/schemas/ErrorModel" + } + } + } + } +} +``` + +```yaml +'200': + description: a pet to be returned + content: + application/json: + schema: + $ref: '#/components/schemas/Pet' +default: + description: Unexpected error + content: + application/json: + schema: + $ref: '#/components/schemas/ErrorModel' +``` + +#### Response Object +Describes a single response from an API Operation, including design-time, static +`links` to operations based on the response. + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +description | `string` | **REQUIRED**. A short description of the response. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +headers | Map[`string`, [Header Object](#headerObject) \| [Reference Object](#referenceObject)] | Maps a header name to its definition. [RFC7230](https://tools.ietf.org/html/rfc7230#page-22) states header names are case insensitive. If a response header is defined with the name `"Content-Type"`, it SHALL be ignored. +content | Map[`string`, [Media Type Object](#mediaTypeObject)] | A map containing descriptions of potential response payloads. The key is a media type or [media type range](https://tools.ietf.org/html/rfc7231#appendix-D) and the value describes it. For responses that match multiple keys, only the most specific key is applicable. e.g. text/plain overrides text/* +links | Map[`string`, [Link Object](#linkObject) \| [Reference Object](#referenceObject)] | A map of operations links that can be followed from the response. The key of the map is a short name for the link, following the naming constraints of the names for [Component Objects](#componentsObject). + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Response Object Examples + +Response of an array of a complex type: + +```json +{ + "description": "A complex object array response", + "content": { + "application/json": { + "schema": { + "type": "array", + "items": { + "$ref": "#/components/schemas/VeryComplexType" + } + } + } + } +} +``` + +```yaml +description: A complex object array response +content: + application/json: + schema: + type: array + items: + $ref: '#/components/schemas/VeryComplexType' +``` + +Response with a string type: + +```json +{ + "description": "A simple string response", + "content": { + "text/plain": { + "schema": { + "type": "string" + } + } + } + +} +``` + +```yaml +description: A simple string response +content: + text/plain: + schema: + type: string +``` + +Plain text response with headers: + +```json +{ + "description": "A simple string response", + "content": { + "text/plain": { + "schema": { + "type": "string" + } + } + }, + "headers": { + "X-Rate-Limit-Limit": { + "description": "The number of allowed requests in the current period", + "schema": { + "type": "integer" + } + }, + "X-Rate-Limit-Remaining": { + "description": "The number of remaining requests in the current period", + "schema": { + "type": "integer" + } + }, + "X-Rate-Limit-Reset": { + "description": "The number of seconds left in the current period", + "schema": { + "type": "integer" + } + } + } +} +``` + +```yaml +description: A simple string response +content: + text/plain: + schema: + type: string + example: 'whoa!' +headers: + X-Rate-Limit-Limit: + description: The number of allowed requests in the current period + schema: + type: integer + X-Rate-Limit-Remaining: + description: The number of remaining requests in the current period + schema: + type: integer + X-Rate-Limit-Reset: + description: The number of seconds left in the current period + schema: + type: integer +``` + +Response with no return value: + +```json +{ + "description": "object created" +} +``` + +```yaml +description: object created +``` + +#### Callback Object + +A map of possible out-of band callbacks related to the parent operation. +Each value in the map is a [Path Item Object](#pathItemObject) that describes a set of requests that may be initiated by the API provider and the expected responses. +The key value used to identify the callback object is an expression, evaluated at runtime, that identifies a URL to use for the callback operation. + +##### Patterned Fields +Field Pattern | Type | Description +---|:---:|--- +{expression} | [Path Item Object](#pathItemObject) | A Path Item Object used to define a callback request and expected responses. A [complete example](../examples/v3.0/callback-example.yaml) is available. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Key Expression + +The key that identifies the [Path Item Object](#pathItemObject) is a [runtime expression](#runtimeExpression) that can be evaluated in the context of a runtime HTTP request/response to identify the URL to be used for the callback request. +A simple example might be `$request.body#/url`. +However, using a [runtime expression](#runtimeExpression) the complete HTTP message can be accessed. +This includes accessing any part of a body that a JSON Pointer [RFC6901](https://tools.ietf.org/html/rfc6901) can reference. + +For example, given the following HTTP request: + +```http +POST /subscribe/myevent?queryUrl=http://clientdomain.com/stillrunning HTTP/1.1 +Host: example.org +Content-Type: application/json +Content-Length: 187 + +{ + "failedUrl" : "http://clientdomain.com/failed", + "successUrls" : [ + "http://clientdomain.com/fast", + "http://clientdomain.com/medium", + "http://clientdomain.com/slow" + ] +} + +201 Created +Location: http://example.org/subscription/1 +``` + +The following examples show how the various expressions evaluate, assuming the callback operation has a path parameter named `eventType` and a query parameter named `queryUrl`. + +Expression | Value +---|:--- +$url | http://example.org/subscribe/myevent?queryUrl=http://clientdomain.com/stillrunning +$method | POST +$request.path.eventType | myevent +$request.query.queryUrl | http://clientdomain.com/stillrunning +$request.header.content-Type | application/json +$request.body#/failedUrl | http://clientdomain.com/stillrunning +$request.body#/successUrls/2 | http://clientdomain.com/medium +$response.header.Location | http://example.org/subscription/1 + + +##### Callback Object Example + +The following example shows a callback to the URL specified by the `id` and `email` property in the request body. + +```yaml +myWebhook: + 'http://notificationServer.com?transactionId={$request.body#/id}&email={$request.body#/email}': + post: + requestBody: + description: Callback payload + content: + 'application/json': + schema: + $ref: '#/components/schemas/SomePayload' + responses: + '200': + description: webhook successfully processed and no retries will be performed +``` + + +#### Example Object + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +summary | `string` | Short description for the example. +description | `string` | Long description for the example. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +value | Any | Embedded literal example. The `value` field and `externalValue` field are mutually exclusive. To represent examples of media types that cannot naturally represented in JSON or YAML, use a string value to contain the example, escaping where necessary. +externalValue | `string` | A URL that points to the literal example. This provides the capability to reference examples that cannot easily be included in JSON or YAML documents. The `value` field and `externalValue` field are mutually exclusive. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +In all cases, the example value is expected to be compatible with the type schema +of its associated value. Tooling implementations MAY choose to +validate compatibility automatically, and reject the example value(s) if incompatible. + +##### Example Object Example + +```yaml +# in a model +schemas: + properties: + name: + type: string + examples: + name: + $ref: http://example.org/petapi-examples/openapi.json#/components/examples/name-example + +# in a request body: + requestBody: + content: + 'application/json': + schema: + $ref: '#/components/schemas/Address' + examples: + foo: + summary: A foo example + value: {"foo": "bar"} + bar: + summary: A bar example + value: {"bar": "baz"} + 'application/xml': + examples: + xmlExample: + summary: This is an example in XML + externalValue: 'http://example.org/examples/address-example.xml' + 'text/plain': + examples: + textExample: + summary: This is a text example + externalValue: 'http://foo.bar/examples/address-example.txt' + + +# in a parameter + parameters: + - name: 'zipCode' + in: 'query' + schema: + type: 'string' + format: 'zip-code' + examples: + zip-example: + $ref: '#/components/examples/zip-example' + +# in a response + responses: + '200': + description: your car appointment has been booked + content: + application/json: + schema: + $ref: '#/components/schemas/SuccessResponse' + examples: + confirmation-success: + $ref: '#/components/examples/confirmation-success' +``` + + +#### Link Object + +The `Link object` represents a possible design-time link for a response. +The presence of a link does not guarantee the caller's ability to successfully invoke it, rather it provides a known relationship and traversal mechanism between responses and other operations. + +Unlike _dynamic_ links (i.e. links provided **in** the response payload), the OAS linking mechanism does not require link information in the runtime response. + +For computing links, and providing instructions to execute them, a [runtime expression](#runtimeExpression) is used for accessing values in an operation and using them as parameters while invoking the linked operation. + +##### Fixed Fields + +Field Name | Type | Description +---|:---:|--- +operationRef | `string` | A relative or absolute reference to an OAS operation. This field is mutually exclusive of the `operationId` field, and MUST point to an [Operation Object](#operationObject). Relative `operationRef` values MAY be used to locate an existing [Operation Object](#operationObject) in the OpenAPI definition. +operationId | `string` | The name of an _existing_, resolvable OAS operation, as defined with a unique `operationId`. This field is mutually exclusive of the `operationRef` field. +parameters | Map[`string`, Any \| [{expression}](#runtimeExpression)] | A map representing parameters to pass to an operation as specified with `operationId` or identified via `operationRef`. The key is the parameter name to be used, whereas the value can be a constant or an expression to be evaluated and passed to the linked operation. The parameter name can be qualified using the [parameter location](#parameterIn) `[{in}.]{name}` for operations that use the same parameter name in different locations (e.g. path.id). +requestBody | Any \| [{expression}](#runtimeExpression) | A literal value or [{expression}](#runtimeExpression) to use as a request body when calling the target operation. +description | `string` | A description of the link. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +server | [Server Object](#serverObject) | A server object to be used by the target operation. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +A linked operation MUST be identified using either an `operationRef` or `operationId`. +In the case of an `operationId`, it MUST be unique and resolved in the scope of the OAS document. +Because of the potential for name clashes, the `operationRef` syntax is preferred +for specifications with external references. + +##### Examples + +Computing a link from a request operation where the `$request.path.id` is used to pass a request parameter to the linked operation. + +```yaml +paths: + /users/{id}: + parameters: + - name: id + in: path + required: true + description: the user identifier, as userId + schema: + type: string + get: + responses: + '200': + description: the user being returned + content: + application/json: + schema: + type: object + properties: + uuid: # the unique user id + type: string + format: uuid + links: + address: + # the target link operationId + operationId: getUserAddress + parameters: + # get the `id` field from the request path parameter named `id` + userId: $request.path.id + # the path item of the linked operation + /users/{userid}/address: + parameters: + - name: userid + in: path + required: true + description: the user identifier, as userId + schema: + type: string + # linked operation + get: + operationId: getUserAddress + responses: + '200': + description: the user's address +``` + +When a runtime expression fails to evaluate, no parameter value is passed to the target operation. + +Values from the response body can be used to drive a linked operation. + +```yaml +links: + address: + operationId: getUserAddressByUUID + parameters: + # get the `uuid` field from the `uuid` field in the response body + userUuid: $response.body#/uuid +``` + +Clients follow all links at their discretion. +Neither permissions, nor the capability to make a successful call to that link, is guaranteed +solely by the existence of a relationship. + + +##### OperationRef Examples + +As references to `operationId` MAY NOT be possible (the `operationId` is an optional +value), references MAY also be made through a relative `operationRef`: + +```yaml +links: + UserRepositories: + # returns array of '#/components/schemas/repository' + operationRef: '#/paths/~12.0~1repositories~1{username}/get' + parameters: + username: $response.body#/username +``` + +or an absolute `operationRef`: + +```yaml +links: + UserRepositories: + # returns array of '#/components/schemas/repository' + operationRef: 'https://na2.gigantic-server.com/#/paths/~12.0~1repositories~1{username}/get' + parameters: + username: $response.body#/username +``` + +Note that in the use of `operationRef`, the _escaped forward-slash_ is necessary when +using JSON references. + + +##### Runtime Expressions + +Runtime expressions allow defining values based on information that will only be available within the HTTP message in an actual API call. +This mechanism is used by [Link Objects](#linkObject) and [Callback Objects](#callbackObject). + +The runtime expression is defined by the following [ABNF](https://tools.ietf.org/html/rfc5234) syntax + +``` + expression = ( "$url" | "$method" | "$statusCode" | "$request." source | "$response." source ) + source = ( header-reference | query-reference | path-reference | body-reference ) + header-reference = "header." token + query-reference = "query." name + path-reference = "path." name + body-reference = "body" ["#" fragment] + fragment = a JSON Pointer [RFC 6901](https://tools.ietf.org/html/rfc6901) + name = *( char ) + char = as per RFC [7159](https://tools.ietf.org/html/rfc7159#section-7) + token = as per RFC [7230](https://tools.ietf.org/html/rfc7230#section-3.2.6) +``` + +The `name` identifier is case-sensitive, whereas `token` is not. + +The table below provides examples of runtime expressions and examples of their use in a value: + +##### Examples + +Source Location | example expression | notes +---|:---|:---| +HTTP Method | `$method` | The allowable values for the `$method` will be those for the HTTP operation. +Requested media type | `$request.header.accept` | +Request parameter | `$request.path.id` | Request parameters MUST be declared in the `parameters` section of the parent operation or they cannot be evaluated. This includes request headers. +Request body property | `$request.body#/user/uuid` | In operations which accept payloads, references may be made to portions of the `requestBody` or the entire body. +Request URL | `$url` | +Response value | `$response.body#/status` | In operations which return payloads, references may be made to portions of the response body or the entire body. +Response header | `$response.header.Server` | Single header values only are available + +Runtime expressions preserve the type of the referenced value. +Expressions can be embedded into string values by surrounding the expression with `{}` curly braces. + +#### Header Object + +The Header Object follows the structure of the [Parameter Object](#parameterObject) with the following changes: + +1. `name` MUST NOT be specified, it is given in the corresponding `headers` map. +1. `in` MUST NOT be specified, it is implicitly in `header`. +1. All traits that are affected by the location MUST be applicable to a location of `header` (for example, [`style`](#parameterStyle)). + +##### Header Object Example + +A simple header of type `integer`: + +```json +{ + "description": "The number of allowed requests in the current period", + "schema": { + "type": "integer" + } +} +``` + +```yaml +description: The number of allowed requests in the current period +schema: + type: integer +``` + +#### Tag Object + +Adds metadata to a single tag that is used by the [Operation Object](#operationObject). +It is not mandatory to have a Tag Object per tag defined in the Operation Object instances. + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +name | `string` | **REQUIRED**. The name of the tag. +description | `string` | A short description for the tag. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +externalDocs | [External Documentation Object](#externalDocumentationObject) | Additional external documentation for this tag. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Tag Object Example + +```json +{ + "name": "pet", + "description": "Pets operations" +} +``` + +```yaml +name: pet +description: Pets operations +``` + + +#### Reference Object + +A simple object to allow referencing other components in the specification, internally and externally. + +The Reference Object is defined by [JSON Reference](https://tools.ietf.org/html/draft-pbryan-zyp-json-ref-03) and follows the same structure, behavior and rules. + +For this specification, reference resolution is accomplished as defined by the JSON Reference specification and not by the JSON Schema specification. + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +$ref | `string` | **REQUIRED**. The reference string. + +This object cannot be extended with additional properties and any properties added SHALL be ignored. + +##### Reference Object Example + +```json +{ + "$ref": "#/components/schemas/Pet" +} +``` + +```yaml +$ref: '#/components/schemas/Pet' +``` + +##### Relative Schema Document Example +```json +{ + "$ref": "Pet.json" +} +``` + +```yaml +$ref: Pet.yaml +``` + +##### Relative Documents With Embedded Schema Example +```json +{ + "$ref": "definitions.json#/Pet" +} +``` + +```yaml +$ref: definitions.yaml#/Pet +``` + +#### Schema Object + +The Schema Object allows the definition of input and output data types. +These types can be objects, but also primitives and arrays. +This object is an extended subset of the [JSON Schema Specification Wright Draft 00](http://json-schema.org/). + +For more information about the properties, see [JSON Schema Core](https://tools.ietf.org/html/draft-wright-json-schema-00) and [JSON Schema Validation](https://tools.ietf.org/html/draft-wright-json-schema-validation-00). +Unless stated otherwise, the property definitions follow the JSON Schema. + +##### Properties + +The following properties are taken directly from the JSON Schema definition and follow the same specifications: + +- title +- multipleOf +- maximum +- exclusiveMaximum +- minimum +- exclusiveMinimum +- maxLength +- minLength +- pattern (This string SHOULD be a valid regular expression, according to the [ECMA 262 regular expression](https://www.ecma-international.org/ecma-262/5.1/#sec-7.8.5) dialect) +- maxItems +- minItems +- uniqueItems +- maxProperties +- minProperties +- required +- enum + +The following properties are taken from the JSON Schema definition but their definitions were adjusted to the OpenAPI Specification. +- type - Value MUST be a string. Multiple types via an array are not supported. +- allOf - Inline or referenced schema MUST be of a [Schema Object](#schemaObject) and not a standard JSON Schema. +- oneOf - Inline or referenced schema MUST be of a [Schema Object](#schemaObject) and not a standard JSON Schema. +- anyOf - Inline or referenced schema MUST be of a [Schema Object](#schemaObject) and not a standard JSON Schema. +- not - Inline or referenced schema MUST be of a [Schema Object](#schemaObject) and not a standard JSON Schema. +- items - Value MUST be an object and not an array. Inline or referenced schema MUST be of a [Schema Object](#schemaObject) and not a standard JSON Schema. `items` MUST be present if the `type` is `array`. +- properties - Property definitions MUST be a [Schema Object](#schemaObject) and not a standard JSON Schema (inline or referenced). +- additionalProperties - Value can be boolean or object. Inline or referenced schema MUST be of a [Schema Object](#schemaObject) and not a standard JSON Schema. +- description - [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +- format - See [Data Type Formats](#dataTypeFormat) for further details. While relying on JSON Schema's defined formats, the OAS offers a few additional predefined formats. +- default - The default value represents what would be assumed by the consumer of the input as the value of the schema if one is not provided. Unlike JSON Schema, the value MUST conform to the defined type for the Schema Object defined at the same level. For example, if `type` is `string`, then `default` can be `"foo"` but cannot be `1`. + +Alternatively, any time a Schema Object can be used, a [Reference Object](#referenceObject) can be used in its place. This allows referencing definitions instead of defining them inline. + +Additional properties defined by the JSON Schema specification that are not mentioned here are strictly unsupported. + +Other than the JSON Schema subset fields, the following fields MAY be used for further schema documentation: + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +nullable | `boolean` | Allows sending a `null` value for the defined schema. Default value is `false`. +discriminator | [Discriminator Object](#discriminatorObject) | Adds support for polymorphism. The discriminator is an object name that is used to differentiate between other schemas which may satisfy the payload description. See [Composition and Inheritance](#schemaComposition) for more details. +readOnly | `boolean` | Relevant only for Schema `"properties"` definitions. Declares the property as "read only". This means that it MAY be sent as part of a response but SHOULD NOT be sent as part of the request. If the property is marked as `readOnly` being `true` and is in the `required` list, the `required` will take effect on the response only. A property MUST NOT be marked as both `readOnly` and `writeOnly` being `true`. Default value is `false`. +writeOnly | `boolean` | Relevant only for Schema `"properties"` definitions. Declares the property as "write only". Therefore, it MAY be sent as part of a request but SHOULD NOT be sent as part of the response. If the property is marked as `writeOnly` being `true` and is in the `required` list, the `required` will take effect on the request only. A property MUST NOT be marked as both `readOnly` and `writeOnly` being `true`. Default value is `false`. +xml | [XML Object](#xmlObject) | This MAY be used only on properties schemas. It has no effect on root schemas. Adds additional metadata to describe the XML representation of this property. +externalDocs | [External Documentation Object](#externalDocumentationObject) | Additional external documentation for this schema. +example | Any | A free-form property to include an example of an instance for this schema. To represent examples that cannot be naturally represented in JSON or YAML, a string value can be used to contain the example with escaping where necessary. + deprecated | `boolean` | Specifies that a schema is deprecated and SHOULD be transitioned out of usage. Default value is `false`. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +###### Composition and Inheritance (Polymorphism) + +The OpenAPI Specification allows combining and extending model definitions using the `allOf` property of JSON Schema, in effect offering model composition. +`allOf` takes an array of object definitions that are validated *independently* but together compose a single object. + +While composition offers model extensibility, it does not imply a hierarchy between the models. +To support polymorphism, the OpenAPI Specification adds the `discriminator` field. +When used, the `discriminator` will be the name of the property that decides which schema definition validates the structure of the model. +As such, the `discriminator` field MUST be a required field. +There are two ways to define the value of a discriminator for an inheriting instance. +- Use the schema name. +- Override the schema name by overriding the property with a new value. If a new value exists, this takes precedence over the schema name. +As such, inline schema definitions, which do not have a given id, *cannot* be used in polymorphism. + +###### XML Modeling + +The [xml](#schemaXml) property allows extra definitions when translating the JSON definition to XML. +The [XML Object](#xmlObject) contains additional information about the available options. + +##### Schema Object Examples + +###### Primitive Sample + +```json +{ + "type": "string", + "format": "email" +} +``` + +```yaml +type: string +format: email +``` + +###### Simple Model + +```json +{ + "type": "object", + "required": [ + "name" + ], + "properties": { + "name": { + "type": "string" + }, + "address": { + "$ref": "#/components/schemas/Address" + }, + "age": { + "type": "integer", + "format": "int32", + "minimum": 0 + } + } +} +``` + +```yaml +type: object +required: +- name +properties: + name: + type: string + address: + $ref: '#/components/schemas/Address' + age: + type: integer + format: int32 + minimum: 0 +``` + +###### Model with Map/Dictionary Properties + +For a simple string to string mapping: + +```json +{ + "type": "object", + "additionalProperties": { + "type": "string" + } +} +``` + +```yaml +type: object +additionalProperties: + type: string +``` + +For a string to model mapping: + +```json +{ + "type": "object", + "additionalProperties": { + "$ref": "#/components/schemas/ComplexModel" + } +} +``` + +```yaml +type: object +additionalProperties: + $ref: '#/components/schemas/ComplexModel' +``` + +###### Model with Example + +```json +{ + "type": "object", + "properties": { + "id": { + "type": "integer", + "format": "int64" + }, + "name": { + "type": "string" + } + }, + "required": [ + "name" + ], + "example": { + "name": "Puma", + "id": 1 + } +} +``` + +```yaml +type: object +properties: + id: + type: integer + format: int64 + name: + type: string +required: +- name +example: + name: Puma + id: 1 +``` + +###### Models with Composition + +```json +{ + "components": { + "schemas": { + "ErrorModel": { + "type": "object", + "required": [ + "message", + "code" + ], + "properties": { + "message": { + "type": "string" + }, + "code": { + "type": "integer", + "minimum": 100, + "maximum": 600 + } + } + }, + "ExtendedErrorModel": { + "allOf": [ + { + "$ref": "#/components/schemas/ErrorModel" + }, + { + "type": "object", + "required": [ + "rootCause" + ], + "properties": { + "rootCause": { + "type": "string" + } + } + } + ] + } + } + } +} +``` + +```yaml +components: + schemas: + ErrorModel: + type: object + required: + - message + - code + properties: + message: + type: string + code: + type: integer + minimum: 100 + maximum: 600 + ExtendedErrorModel: + allOf: + - $ref: '#/components/schemas/ErrorModel' + - type: object + required: + - rootCause + properties: + rootCause: + type: string +``` + +###### Models with Polymorphism Support + +```json +{ + "components": { + "schemas": { + "Pet": { + "type": "object", + "discriminator": { + "propertyName": "petType" + }, + "properties": { + "name": { + "type": "string" + }, + "petType": { + "type": "string" + } + }, + "required": [ + "name", + "petType" + ] + }, + "Cat": { + "description": "A representation of a cat. Note that `Cat` will be used as the discriminator value.", + "allOf": [ + { + "$ref": "#/components/schemas/Pet" + }, + { + "type": "object", + "properties": { + "huntingSkill": { + "type": "string", + "description": "The measured skill for hunting", + "default": "lazy", + "enum": [ + "clueless", + "lazy", + "adventurous", + "aggressive" + ] + } + }, + "required": [ + "huntingSkill" + ] + } + ] + }, + "Dog": { + "description": "A representation of a dog. Note that `Dog` will be used as the discriminator value.", + "allOf": [ + { + "$ref": "#/components/schemas/Pet" + }, + { + "type": "object", + "properties": { + "packSize": { + "type": "integer", + "format": "int32", + "description": "the size of the pack the dog is from", + "default": 0, + "minimum": 0 + } + }, + "required": [ + "packSize" + ] + } + ] + } + } + } +} +``` + +```yaml +components: + schemas: + Pet: + type: object + discriminator: + propertyName: petType + properties: + name: + type: string + petType: + type: string + required: + - name + - petType + Cat: ## "Cat" will be used as the discriminator value + description: A representation of a cat + allOf: + - $ref: '#/components/schemas/Pet' + - type: object + properties: + huntingSkill: + type: string + description: The measured skill for hunting + enum: + - clueless + - lazy + - adventurous + - aggressive + required: + - huntingSkill + Dog: ## "Dog" will be used as the discriminator value + description: A representation of a dog + allOf: + - $ref: '#/components/schemas/Pet' + - type: object + properties: + packSize: + type: integer + format: int32 + description: the size of the pack the dog is from + default: 0 + minimum: 0 + required: + - packSize +``` + +#### Discriminator Object + +When request bodies or response payloads may be one of a number of different schemas, a `discriminator` object can be used to aid in serialization, deserialization, and validation. The discriminator is a specific object in a schema which is used to inform the consumer of the specification of an alternative schema based on the value associated with it. + +When using the discriminator, _inline_ schemas will not be considered. + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +propertyName | `string` | **REQUIRED**. The name of the property in the payload that will hold the discriminator value. + mapping | Map[`string`, `string`] | An object to hold mappings between payload values and schema names or references. + +The discriminator attribute is legal only when using one of the composite keywords `oneOf`, `anyOf`, `allOf`. + +In OAS 3.0, a response payload MAY be described to be exactly one of any number of types: + +``` +MyResponseType: + oneOf: + - $ref: '#/components/schemas/Cat' + - $ref: '#/components/schemas/Dog' + - $ref: '#/components/schemas/Lizard' +``` + +which means the payload _MUST_, by validation, match exactly one of the schemas described by `Cat`, `Dog`, or `Lizard`. In this case, a discriminator MAY act as a "hint" to shortcut validation and selection of the matching schema which may be a costly operation, depending on the complexity of the schema. We can then describe exactly which field tells us which schema to use: + + +``` +MyResponseType: + oneOf: + - $ref: '#/components/schemas/Cat' + - $ref: '#/components/schemas/Dog' + - $ref: '#/components/schemas/Lizard' + discriminator: + propertyName: pet_type +``` + +The expectation now is that a property with name `pet_type` _MUST_ be present in the response payload, and the value will correspond to the name of a schema defined in the OAS document. Thus the response payload: + +``` +{ + "id": 12345, + "pet_type": "Cat" +} +``` + +Will indicate that the `Cat` schema be used in conjunction with this payload. + +In scenarios where the value of the discriminator field does not match the schema name or implicit mapping is not possible, an optional `mapping` definition MAY be used: + +``` +MyResponseType: + oneOf: + - $ref: '#/components/schemas/Cat' + - $ref: '#/components/schemas/Dog' + - $ref: '#/components/schemas/Lizard' + - $ref: 'https://gigantic-server.com/schemas/Monster/schema.json' + discriminator: + propertyName: pet_type + mapping: + dog: '#/components/schemas/Dog' + monster: 'https://gigantic-server.com/schemas/Monster/schema.json' +``` + +Here the discriminator _value_ of `dog` will map to the schema `#/components/schemas/Dog`, rather than the default (implicit) value of `Dog`. If the discriminator _value_ does not match an implicit or explicit mapping, no schema can be determined and validation SHOULD fail. Mapping keys MUST be string values, but tooling MAY convert response values to strings for comparison. + +When used in conjunction with the `anyOf` construct, the use of the discriminator can avoid ambiguity where multiple schemas may satisfy a single payload. + +In both the `oneOf` and `anyOf` use cases, all possible schemas MUST be listed explicitly. To avoid redundancy, the discriminator MAY be added to a parent schema definition, and all schemas comprising the parent schema in an `allOf` construct may be used as an alternate schema. + +For example: + +``` +components: + schemas: + Pet: + type: object + required: + - pet_type + properties: + pet_type: + type: string + discriminator: + propertyName: pet_type + mapping: + cachorro: Dog + Cat: + allOf: + - $ref: '#/components/schemas/Pet' + - type: object + # all other properties specific to a `Cat` + properties: + name: + type: string + Dog: + allOf: + - $ref: '#/components/schemas/Pet' + - type: object + # all other properties specific to a `Dog` + properties: + bark: + type: string + Lizard: + allOf: + - $ref: '#/components/schemas/Pet' + - type: object + # all other properties specific to a `Lizard` + properties: + lovesRocks: + type: boolean +``` + +a payload like this: + +``` +{ + "pet_type": "Cat", + "name": "misty" +} +``` + +will indicate that the `Cat` schema be used. Likewise this schema: + +``` +{ + "pet_type": "cachorro", + "bark": "soft" +} +``` + +will map to `Dog` because of the definition in the `mappings` element. + + +#### XML Object + +A metadata object that allows for more fine-tuned XML model definitions. + +When using arrays, XML element names are *not* inferred (for singular/plural forms) and the `name` property SHOULD be used to add that information. +See examples for expected behavior. + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +name | `string` | Replaces the name of the element/attribute used for the described schema property. When defined within `items`, it will affect the name of the individual XML elements within the list. When defined alongside `type` being `array` (outside the `items`), it will affect the wrapping element and only if `wrapped` is `true`. If `wrapped` is `false`, it will be ignored. +namespace | `string` | The URI of the namespace definition. Value MUST be in the form of an absolute URI. +prefix | `string` | The prefix to be used for the [name](#xmlName). +attribute | `boolean` | Declares whether the property definition translates to an attribute instead of an element. Default value is `false`. +wrapped | `boolean` | MAY be used only for an array definition. Signifies whether the array is wrapped (for example, ``) or unwrapped (``). Default value is `false`. The definition takes effect only when defined alongside `type` being `array` (outside the `items`). + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### XML Object Examples + +The examples of the XML object definitions are included inside a property definition of a [Schema Object](#schemaObject) with a sample of the XML representation of it. + +###### No XML Element + +Basic string property: + +```json +{ + "animals": { + "type": "string" + } +} +``` + +```yaml +animals: + type: string +``` + +```xml +... +``` + +Basic string array property ([`wrapped`](#xmlWrapped) is `false` by default): + +```json +{ + "animals": { + "type": "array", + "items": { + "type": "string" + } + } +} +``` + +```yaml +animals: + type: array + items: + type: string +``` + +```xml +... +... +... +``` + +###### XML Name Replacement + +```json +{ + "animals": { + "type": "string", + "xml": { + "name": "animal" + } + } +} +``` + +```yaml +animals: + type: string + xml: + name: animal +``` + +```xml +... +``` + + +###### XML Attribute, Prefix and Namespace + +In this example, a full model definition is shown. + +```json +{ + "Person": { + "type": "object", + "properties": { + "id": { + "type": "integer", + "format": "int32", + "xml": { + "attribute": true + } + }, + "name": { + "type": "string", + "xml": { + "namespace": "http://example.com/schema/sample", + "prefix": "sample" + } + } + } + } +} +``` + +```yaml +Person: + type: object + properties: + id: + type: integer + format: int32 + xml: + attribute: true + name: + type: string + xml: + namespace: http://example.com/schema/sample + prefix: sample +``` + +```xml + + example + +``` + +###### XML Arrays + +Changing the element names: + +```json +{ + "animals": { + "type": "array", + "items": { + "type": "string", + "xml": { + "name": "animal" + } + } + } +} +``` + +```yaml +animals: + type: array + items: + type: string + xml: + name: animal +``` + +```xml +value +value +``` + +The external `name` property has no effect on the XML: + +```json +{ + "animals": { + "type": "array", + "items": { + "type": "string", + "xml": { + "name": "animal" + } + }, + "xml": { + "name": "aliens" + } + } +} +``` + +```yaml +animals: + type: array + items: + type: string + xml: + name: animal + xml: + name: aliens +``` + +```xml +value +value +``` + +Even when the array is wrapped, if a name is not explicitly defined, the same name will be used both internally and externally: + +```json +{ + "animals": { + "type": "array", + "items": { + "type": "string" + }, + "xml": { + "wrapped": true + } + } +} +``` + +```yaml +animals: + type: array + items: + type: string + xml: + wrapped: true +``` + +```xml + + value + value + +``` + +To overcome the naming problem in the example above, the following definition can be used: + +```json +{ + "animals": { + "type": "array", + "items": { + "type": "string", + "xml": { + "name": "animal" + } + }, + "xml": { + "wrapped": true + } + } +} +``` + +```yaml +animals: + type: array + items: + type: string + xml: + name: animal + xml: + wrapped: true +``` + +```xml + + value + value + +``` + +Affecting both internal and external names: + +```json +{ + "animals": { + "type": "array", + "items": { + "type": "string", + "xml": { + "name": "animal" + } + }, + "xml": { + "name": "aliens", + "wrapped": true + } + } +} +``` + +```yaml +animals: + type: array + items: + type: string + xml: + name: animal + xml: + name: aliens + wrapped: true +``` + +```xml + + value + value + +``` + +If we change the external element but not the internal ones: + +```json +{ + "animals": { + "type": "array", + "items": { + "type": "string" + }, + "xml": { + "name": "aliens", + "wrapped": true + } + } +} +``` + +```yaml +animals: + type: array + items: + type: string + xml: + name: aliens + wrapped: true +``` + +```xml + + value + value + +``` + +#### Security Scheme Object + +Defines a security scheme that can be used by the operations. +Supported schemes are HTTP authentication, an API key (either as a header or as a query parameter), OAuth2's common flows (implicit, password, application and access code) as defined in [RFC6749](https://tools.ietf.org/html/rfc6749), and [OpenID Connect Discovery](https://tools.ietf.org/html/draft-ietf-oauth-discovery-06). + +##### Fixed Fields +Field Name | Type | Applies To | Description +---|:---:|---|--- +type | `string` | Any | **REQUIRED**. The type of the security scheme. Valid values are `"apiKey"`, `"http"`, `"oauth2"`, `"openIdConnect"`. +description | `string` | Any | A short description for security scheme. [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation. +name | `string` | `apiKey` | **REQUIRED**. The name of the header, query or cookie parameter to be used. +in | `string` | `apiKey` | **REQUIRED**. The location of the API key. Valid values are `"query"`, `"header"` or `"cookie"`. +scheme | `string` | `http` | **REQUIRED**. The name of the HTTP Authorization scheme to be used in the [Authorization header as defined in RFC7235](https://tools.ietf.org/html/rfc7235#section-5.1). +bearerFormat | `string` | `http` (`"bearer"`) | A hint to the client to identify how the bearer token is formatted. Bearer tokens are usually generated by an authorization server, so this information is primarily for documentation purposes. +flows | [OAuth Flows Object](#oauthFlowsObject) | `oauth2` | **REQUIRED**. An object containing configuration information for the flow types supported. +openIdConnectUrl | `string` | `openIdConnect` | **REQUIRED**. OpenId Connect URL to discover OAuth2 configuration values. This MUST be in the form of a URL. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### Security Scheme Object Example + +###### Basic Authentication Sample + +```json +{ + "type": "http", + "scheme": "basic" +} +``` + +```yaml +type: http +scheme: basic +``` + +###### API Key Sample + +```json +{ + "type": "apiKey", + "name": "api_key", + "in": "header" +} +``` + +```yaml +type: apiKey +name: api_key +in: header +``` + +###### JWT Bearer Sample + +```json +{ + "type": "http", + "scheme": "bearer", + "bearerFormat": "JWT", +} +``` + +```yaml +type: http +scheme: bearer +bearerFormat: JWT +``` + +###### Implicit OAuth2 Sample + +```json +{ + "type": "oauth2", + "flows": { + "implicit": { + "authorizationUrl": "https://example.com/api/oauth/dialog", + "scopes": { + "write:pets": "modify pets in your account", + "read:pets": "read your pets" + } + } + } +} +``` + +```yaml +type: oauth2 +flows: + implicit: + authorizationUrl: https://example.com/api/oauth/dialog + scopes: + write:pets: modify pets in your account + read:pets: read your pets +``` + +#### OAuth Flows Object + +Allows configuration of the supported OAuth Flows. + +##### Fixed Fields +Field Name | Type | Description +---|:---:|--- +implicit| [OAuth Flow Object](#oauthFlowObject) | Configuration for the OAuth Implicit flow +password| [OAuth Flow Object](#oauthFlowObject) | Configuration for the OAuth Resource Owner Password flow +clientCredentials| [OAuth Flow Object](#oauthFlowObject) | Configuration for the OAuth Client Credentials flow. Previously called `application` in OpenAPI 2.0. +authorizationCode| [OAuth Flow Object](#oauthFlowObject) | Configuration for the OAuth Authorization Code flow. Previously called `accessCode` in OpenAPI 2.0. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +#### OAuth Flow Object + +Configuration details for a supported OAuth Flow + +##### Fixed Fields +Field Name | Type | Applies To | Description +---|:---:|---|--- +authorizationUrl | `string` | `oauth2` (`"implicit"`, `"authorizationCode"`) | **REQUIRED**. The authorization URL to be used for this flow. This MUST be in the form of a URL. +tokenUrl | `string` | `oauth2` (`"password"`, `"clientCredentials"`, `"authorizationCode"`) | **REQUIRED**. The token URL to be used for this flow. This MUST be in the form of a URL. +refreshUrl | `string` | `oauth2` | The URL to be used for obtaining refresh tokens. This MUST be in the form of a URL. +scopes | Map[`string`, `string`] | `oauth2` | **REQUIRED**. The available scopes for the OAuth2 security scheme. A map between the scope name and a short description for it. + +This object MAY be extended with [Specification Extensions](#specificationExtensions). + +##### OAuth Flow Object Examples + +```JSON +{ + "type": "oauth2", + "flows": { + "implicit": { + "authorizationUrl": "https://example.com/api/oauth/dialog", + "scopes": { + "write:pets": "modify pets in your account", + "read:pets": "read your pets" + } + }, + "authorizationCode": { + "authorizationUrl": "https://example.com/api/oauth/dialog", + "tokenUrl": "https://example.com/api/oauth/token", + "scopes": { + "write:pets": "modify pets in your account", + "read:pets": "read your pets" + } + } + } +} +``` + +```YAML +type: oauth2 +flows: + implicit: + authorizationUrl: https://example.com/api/oauth/dialog + scopes: + write:pets: modify pets in your account + read:pets: read your pets + authorizationCode: + authorizationUrl: https://example.com/api/oauth/dialog + tokenUrl: https://example.com/api/oauth/token + scopes: + write:pets: modify pets in your account + read:pets: read your pets +``` + + +#### Security Requirement Object + +Lists the required security schemes to execute this operation. +The name used for each property MUST correspond to a security scheme declared in the [Security Schemes](#componentsSecuritySchemes) under the [Components Object](#componentsObject). + +Security Requirement Objects that contain multiple schemes require that all schemes MUST be satisfied for a request to be authorized. +This enables support for scenarios where multiple query parameters or HTTP headers are required to convey security information. + +When a list of Security Requirement Objects is defined on the [Open API object](#oasObject) or [Operation Object](#operationObject), only one of Security Requirement Objects in the list needs to be satisfied to authorize the request. + +##### Patterned Fields + +Field Pattern | Type | Description +---|:---:|--- +{name} | [`string`] | Each name MUST correspond to a security scheme which is declared in the [Security Schemes](#componentsSecuritySchemes) under the [Components Object](#componentsObject). If the security scheme is of type `"oauth2"` or `"openIdConnect"`, then the value is a list of scope names required for the execution. For other security scheme types, the array MUST be empty. + +##### Security Requirement Object Examples + +###### Non-OAuth2 Security Requirement + +```json +{ + "api_key": [] +} +``` + +```yaml +api_key: [] +``` + +###### OAuth2 Security Requirement + +```json +{ + "petstore_auth": [ + "write:pets", + "read:pets" + ] +} +``` + +```yaml +petstore_auth: +- write:pets +- read:pets +``` + +### Specification Extensions + +While the OpenAPI Specification tries to accommodate most use cases, additional data can be added to extend the specification at certain points. + +The extensions properties are implemented as patterned fields that are always prefixed by `"x-"`. + +Field Pattern | Type | Description +---|:---:|--- +^x- | Any | Allows extensions to the OpenAPI Schema. The field name MUST begin with `x-`, for example, `x-internal-id`. The value can be `null`, a primitive, an array or an object. Can have any valid JSON format value. + +The extensions may or may not be supported by the available tooling, but those may be extended as well to add requested support (if tools are internal or open-sourced). + +### Security Filtering + +Some objects in the OpenAPI Specification MAY be declared and remain empty, or be completely removed, even though they are inherently the core of the API documentation. + +The reasoning is to allow an additional layer of access control over the documentation. +While not part of the specification itself, certain libraries MAY choose to allow access to parts of the documentation based on some form of authentication/authorization. + +Two examples of this: + +1. The [Paths Object](#pathsObject) MAY be empty. It may be counterintuitive, but this may tell the viewer that they got to the right place, but can't access any documentation. They'd still have access to the [Info Object](#infoObject) which may contain additional information regarding authentication. +2. The [Path Item Object](#pathItemObject) MAY be empty. In this case, the viewer will be aware that the path exists, but will not be able to see any of its operations or parameters. This is different than hiding the path itself from the [Paths Object](#pathsObject), so the user will not be aware of its existence. This allows the documentation provider to finely control what the viewer can see. + +## Appendix A: Revision History + +Version | Date | Notes +--- | --- | --- +3.0.1 | 2017-12-06 | Patch release of the OpenAPI Specification 3.0.1 +3.0.0 | 2017-07-26 | Release of the OpenAPI Specification 3.0.0 +3.0.0-rc2 | 2017-06-16 | rc2 of the 3.0 specification +3.0.0-rc1 | 2017-04-27 | rc1 of the 3.0 specification +3.0.0-rc0 | 2017-02-28 | Implementer's Draft of the 3.0 specification +2.0 | 2015-12-31 | Donation of Swagger 2.0 to the Open API Initiative +2.0 | 2014-09-08 | Release of Swagger 2.0 +1.2 | 2014-03-14 | Initial release of the formal document. +1.1 | 2012-08-22 | Release of Swagger 1.1 +1.0 | 2011-08-10 | First release of the Swagger Specification