JSON errors get escaped

[Kukunin]

I have a simple API

  class Root < Grape::API
    content_type :json, 'application/json; charset=UTF-8'
    default_format :json

    rescue_from ActiveRecord::RecordNotFound do
      error!({ error: :not_found }, 404)
    end
  end

When an ActiveRecord::RecordNotFound is raised, I expect my API returns "{"error":"not_found"} as JSON, but it retures {"error":"not_found"}

It worked well in 1.0.3 version but broken in 1.1.0

Is there any workaround for it?

It's related to #1763

[dblock]

What is the content-type returned in the error response @Kukunin? I am going to guess it's text/plain.

Your default format for when the content type is not specified is json, but your default format otherwise is not. Without testing, I would try either adding format :json or default_error_formatter :json. Does that make a difference?

[Kukunin]

You were right. The content-type was 'text/html'. Replacing default_format :json to format :json helped, and not everything is fine

[dblock]

Happy to help. Let's close this.