diff --git a/core-api/src/main/java/com/optimizely/ab/config/DatafileProjectConfig.java b/core-api/src/main/java/com/optimizely/ab/config/DatafileProjectConfig.java
index 050f57add..0b188f064 100644
--- a/core-api/src/main/java/com/optimizely/ab/config/DatafileProjectConfig.java
+++ b/core-api/src/main/java/com/optimizely/ab/config/DatafileProjectConfig.java
@@ -1,6 +1,6 @@
 /**
  *
- *    Copyright 2016-2019, Optimizely and contributors
+ *    Copyright 2016-2020, Optimizely and contributors
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -43,7 +43,6 @@
  * Optimizely provides custom JSON parsers to extract objects from the JSON payload
  * to populate the members of this class. {@link DefaultConfigParser} for details.
  */
-@Immutable
 @JsonIgnoreProperties(ignoreUnknown = true)
 public class DatafileProjectConfig implements ProjectConfig {
 
@@ -88,6 +87,8 @@ public class DatafileProjectConfig implements ProjectConfig {
     // other mappings
     private final Map<String, Experiment> variationIdToExperimentMapping;
 
+    private String datafile;
+
     // v2 constructor
     public DatafileProjectConfig(String accountId, String projectId, String version, String revision, List<Group> groups,
                                  List<Experiment> experiments, List<Attribute> attributes, List<EventType> eventType,
@@ -301,6 +302,11 @@ public String getAccountId() {
         return accountId;
     }
 
+    @Override
+    public String toDatafile() {
+        return datafile;
+    }
+
     @Override
     public String getProjectId() {
         return projectId;
@@ -481,6 +487,9 @@ public ProjectConfig build() throws ConfigParseException {
             }
 
             ProjectConfig projectConfig = DefaultConfigParser.getInstance().parseProjectConfig(datafile);
+            if (projectConfig instanceof DatafileProjectConfig) {
+                ((DatafileProjectConfig) projectConfig).datafile = datafile;
+            }
 
             if (!supportedVersions.contains(projectConfig.getVersion())) {
                 throw new ConfigParseException("This version of the Java SDK does not support the given datafile version: " + projectConfig.getVersion());
diff --git a/core-api/src/main/java/com/optimizely/ab/config/ProjectConfig.java b/core-api/src/main/java/com/optimizely/ab/config/ProjectConfig.java
index 6f7f3f066..7f83e30b8 100644
--- a/core-api/src/main/java/com/optimizely/ab/config/ProjectConfig.java
+++ b/core-api/src/main/java/com/optimizely/ab/config/ProjectConfig.java
@@ -1,6 +1,6 @@
 /**
  *
- *    Copyright 2016-2019, Optimizely and contributors
+ *    Copyright 2016-2020, Optimizely and contributors
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -47,6 +47,8 @@ Experiment getExperimentForKey(@Nonnull String experimentKey,
 
     String getAccountId();
 
+    String toDatafile();
+
     String getProjectId();
 
     String getVersion();
diff --git a/core-api/src/main/java/com/optimizely/ab/optimizelyconfig/OptimizelyConfig.java b/core-api/src/main/java/com/optimizely/ab/optimizelyconfig/OptimizelyConfig.java
index 2696a4b1c..3e1ab5d5b 100644
--- a/core-api/src/main/java/com/optimizely/ab/optimizelyconfig/OptimizelyConfig.java
+++ b/core-api/src/main/java/com/optimizely/ab/optimizelyconfig/OptimizelyConfig.java
@@ -15,6 +15,7 @@
  ***************************************************************************/
 package com.optimizely.ab.optimizelyconfig;
 
+
 import java.util.*;
 
 /**
@@ -25,13 +26,22 @@ public class OptimizelyConfig {
     private Map<String, OptimizelyExperiment> experimentsMap;
     private Map<String, OptimizelyFeature> featuresMap;
     private String revision;
+    private String datafile;
 
     public OptimizelyConfig(Map<String, OptimizelyExperiment> experimentsMap, 
                             Map<String, OptimizelyFeature> featuresMap,
                             String revision) {
+        this(experimentsMap, featuresMap, revision, null);
+    }
+
+    public OptimizelyConfig(Map<String, OptimizelyExperiment> experimentsMap,
+                            Map<String, OptimizelyFeature> featuresMap,
+                            String revision,
+                            String datafile) {
         this.experimentsMap = experimentsMap;
         this.featuresMap = featuresMap;
-        this.revision = revision;                          
+        this.revision = revision;
+        this.datafile = datafile;
     }
 
     public Map<String, OptimizelyExperiment> getExperimentsMap() {
@@ -46,6 +56,10 @@ public String getRevision() {
         return revision;
     }
 
+    public String getDatafile() {
+        return datafile;
+    }
+
     @Override
     public boolean equals(Object obj) {
         if (obj == null || getClass() != obj.getClass()) return false;
diff --git a/core-api/src/main/java/com/optimizely/ab/optimizelyconfig/OptimizelyConfigService.java b/core-api/src/main/java/com/optimizely/ab/optimizelyconfig/OptimizelyConfigService.java
index 4ec447ead..f739ae549 100644
--- a/core-api/src/main/java/com/optimizely/ab/optimizelyconfig/OptimizelyConfigService.java
+++ b/core-api/src/main/java/com/optimizely/ab/optimizelyconfig/OptimizelyConfigService.java
@@ -31,7 +31,8 @@ public OptimizelyConfigService(ProjectConfig projectConfig) {
         optimizelyConfig = new OptimizelyConfig(
             experimentsMap,
             getFeaturesMap(experimentsMap),
-            projectConfig.getRevision()
+            projectConfig.getRevision(),
+            projectConfig.toDatafile()
         );
     }
 
diff --git a/core-api/src/test/java/com/optimizely/ab/OptimizelyTest.java b/core-api/src/test/java/com/optimizely/ab/OptimizelyTest.java
index 6c32975a8..21dcd017e 100644
--- a/core-api/src/test/java/com/optimizely/ab/OptimizelyTest.java
+++ b/core-api/src/test/java/com/optimizely/ab/OptimizelyTest.java
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright 2016-2019, Optimizely, Inc. and contributors                   *
+ * Copyright 2016-2020, Optimizely, Inc. and contributors                   *
  *                                                                          *
  * Licensed under the Apache License, Version 2.0 (the "License");          *
  * you may not use this file except in compliance with the License.         *
@@ -4572,4 +4572,11 @@ public void getForcedVariationEmptyExperimentKey() {
         Optimizely optimizely = optimizelyBuilder.build();
         assertNull(optimizely.getForcedVariation("", "testUser1"));
     }
+
+    @Test
+    public void getOptimizelyConfigValidDatafile() {
+        Optimizely optimizely = optimizelyBuilder.build();
+        assertEquals(optimizely.getOptimizelyConfig().getDatafile(), validDatafile);
+    }
+
 }
diff --git a/core-api/src/test/java/com/optimizely/ab/config/DatafileProjectConfigBuilderTest.java b/core-api/src/test/java/com/optimizely/ab/config/DatafileProjectConfigBuilderTest.java
index 7b4f78bf9..533be8be2 100644
--- a/core-api/src/test/java/com/optimizely/ab/config/DatafileProjectConfigBuilderTest.java
+++ b/core-api/src/test/java/com/optimizely/ab/config/DatafileProjectConfigBuilderTest.java
@@ -55,6 +55,8 @@ public void withValidDatafile() throws Exception {
         ProjectConfig projectConfig = new DatafileProjectConfig.Builder()
             .withDatafile(validConfigJsonV4())
             .build();
+
+        assertEquals(projectConfig.toDatafile(), validConfigJsonV4());
         assertNotNull(projectConfig);
         assertEquals("4", projectConfig.getVersion());
     }