diff --git a/src/Optimizely/Config/DatafileProjectConfig.php b/src/Optimizely/Config/DatafileProjectConfig.php
index efceebe6..f7dd3251 100644
--- a/src/Optimizely/Config/DatafileProjectConfig.php
+++ b/src/Optimizely/Config/DatafileProjectConfig.php
@@ -88,6 +88,11 @@ class DatafileProjectConfig implements ProjectConfigInterface
      */
     private $_botFiltering;
 
+    /**
+     * @var string datafile.
+     */
+    private $datafile;
+
     /**
      * @var string Revision of the datafile.
      */
@@ -196,6 +201,7 @@ public function __construct($datafile, $logger, $errorHandler)
     {
         $supportedVersions = array(self::V2, self::V3, self::V4);
         $config = json_decode($datafile, true);
+        $this->datafile = $datafile;
         $this->_logger = $logger;
         $this->_errorHandler = $errorHandler;
         $this->_version = $config['version'];
@@ -355,6 +361,14 @@ public static function createProjectConfigFromDatafile($datafile, $skipJsonValid
         return $config;
     }
 
+    /**
+     * @return string String representing contents of datafile.
+     */
+    public function toDatafile()
+    {
+        return $this->datafile;
+    }
+
     /**
      * @return string String representing account ID from the datafile.
      */
diff --git a/src/Optimizely/Config/ProjectConfigInterface.php b/src/Optimizely/Config/ProjectConfigInterface.php
index 4507c0a9..55bc2ba4 100644
--- a/src/Optimizely/Config/ProjectConfigInterface.php
+++ b/src/Optimizely/Config/ProjectConfigInterface.php
@@ -159,4 +159,11 @@ public function getFeatureVariableFromKey($featureFlagKey, $variableKey);
      * @return boolean A boolean value that indicates if the experiment is a feature test.
      */
     public function isFeatureExperiment($experimentId);
+
+    /**
+     * Returns string representation of datafile.
+     *
+     * @return string A string value that contains datafile contents.
+     */
+    public function toDatafile();
 }
diff --git a/src/Optimizely/OptimizelyConfig/OptimizelyConfig.php b/src/Optimizely/OptimizelyConfig/OptimizelyConfig.php
index 133f071b..fdd5736c 100644
--- a/src/Optimizely/OptimizelyConfig/OptimizelyConfig.php
+++ b/src/Optimizely/OptimizelyConfig/OptimizelyConfig.php
@@ -37,11 +37,18 @@ class OptimizelyConfig implements \JsonSerializable
      */
     private $featuresMap;
 
-    public function __construct($revision, array $experimentsMap, array $featuresMap)
+    /**
+     * @var string Contents of datafile.
+     */
+    private $datafile;
+    
+
+    public function __construct($revision, array $experimentsMap, array $featuresMap, $datafile = null)
     {
         $this->revision = $revision;
         $this->experimentsMap = $experimentsMap;
         $this->featuresMap = $featuresMap;
+        $this->datafile = $datafile;
     }
 
     /**
@@ -52,6 +59,14 @@ public function getRevision()
         return $this->revision;
     }
 
+    /**
+     * @return string Datafile contents.
+     */
+    public function getDatafile()
+    {
+        return $this->datafile;
+    }
+
     /**
      * @return array Map of Experiment Keys to OptimizelyExperiments.
      */
diff --git a/src/Optimizely/OptimizelyConfig/OptimizelyConfigService.php b/src/Optimizely/OptimizelyConfig/OptimizelyConfigService.php
index 6032548d..eef1829a 100644
--- a/src/Optimizely/OptimizelyConfig/OptimizelyConfigService.php
+++ b/src/Optimizely/OptimizelyConfig/OptimizelyConfigService.php
@@ -37,6 +37,11 @@ class OptimizelyConfigService
      */
     private $revision;
 
+    /**
+     * @var string String denoting datafile.
+     */
+    private $datafile;
+
     /**
      * Map of experiment IDs to FeatureFlags.
      *
@@ -63,6 +68,7 @@ public function __construct(ProjectConfigInterface $projectConfig)
         $this->experiments = $projectConfig->getAllExperiments();
         $this->featureFlags = $projectConfig->getFeatureFlags();
         $this->revision = $projectConfig->getRevision();
+        $this->datafile = $projectConfig->toDatafile();
         
         $this->createLookupMaps();
     }
@@ -78,7 +84,8 @@ public function getConfig()
         return new OptimizelyConfig(
             $this->revision,
             $experimentsMaps[0],
-            $featuresMap
+            $featuresMap,
+            $this->datafile
         );
     }
     
diff --git a/tests/ConfigTests/DatafileProjectConfigTest.php b/tests/ConfigTests/DatafileProjectConfigTest.php
index 360055dc..d7e72e6b 100644
--- a/tests/ConfigTests/DatafileProjectConfigTest.php
+++ b/tests/ConfigTests/DatafileProjectConfigTest.php
@@ -719,4 +719,13 @@ public function testIsFeatureExperiment()
         $this->assertTrue($this->config->isFeatureExperiment($featureExperiment->getId()));
         $this->assertFalse($this->config->isFeatureExperiment($experiment->getId()));
     }
+
+    public function testToDatafile()
+    {
+        $expectedDatafile = DATAFILE_FOR_OPTIMIZELY_CONFIG;
+        $this->config = new DatafileProjectConfig($expectedDatafile, $this->loggerMock, $this->errorHandlerMock);
+        $actualDatafile = $this->config->toDatafile();
+
+        $this->assertEquals($expectedDatafile, $actualDatafile);
+    }
 }
diff --git a/tests/OptimizelyConfigTests/OptimizelyConfigServiceTest.php b/tests/OptimizelyConfigTests/OptimizelyConfigServiceTest.php
index a64e5032..0a1d5ad8 100644
--- a/tests/OptimizelyConfigTests/OptimizelyConfigServiceTest.php
+++ b/tests/OptimizelyConfigTests/OptimizelyConfigServiceTest.php
@@ -465,6 +465,16 @@ public function testJsonEncodeofOptimizelyConfig()
           }
         }';
 
-        $this->assertEquals(json_encode(json_decode($expectedJSON)), json_encode($response));
+        $optimizelyConfig = json_decode($expectedJSON, true);
+        $optimizelyConfig['datafile'] = DATAFILE_FOR_OPTIMIZELY_CONFIG;
+
+        $this->assertEquals(json_encode($optimizelyConfig), json_encode($response));
+    }
+
+    public function testGetDatafile()
+    {
+        $expectedDatafile = DATAFILE_FOR_OPTIMIZELY_CONFIG;
+        $actualDatafile = $this->optConfigService->getConfig()->getDatafile();
+        $this->assertEquals($expectedDatafile, $actualDatafile);
     }
 }
diff --git a/tests/OptimizelyConfigTests/OptimizelyEntitiesTest.php b/tests/OptimizelyConfigTests/OptimizelyEntitiesTest.php
index 40b3e3a2..3551af3f 100644
--- a/tests/OptimizelyConfigTests/OptimizelyEntitiesTest.php
+++ b/tests/OptimizelyConfigTests/OptimizelyEntitiesTest.php
@@ -41,7 +41,8 @@ public function testOptimizelyConfigEntity()
         $expectedJson = '{
             "revision": "20",
             "experimentsMap" : {"a": "apple"},
-            "featuresMap": {"o": "orange"}
+            "featuresMap": {"o": "orange"},
+            "datafile": null
         }';
 
         $expectedJson = json_encode(json_decode($expectedJson));