diff --git a/src/Symfony/Component/Serializer/CHANGELOG.md b/src/Symfony/Component/Serializer/CHANGELOG.md
index 5b859623fef09..66081baa05854 100644
--- a/src/Symfony/Component/Serializer/CHANGELOG.md
+++ b/src/Symfony/Component/Serializer/CHANGELOG.md
@@ -5,6 +5,8 @@ CHANGELOG
 -----
 
  * added `$context` support for XMLEncoder.
+ * [DEPRECATION] JsonEncode and JsonDecode where modified to throw
+   an exception if error found. No need for get*Error() functions
 
 2.3.0
 -----
diff --git a/src/Symfony/Component/Serializer/Encoder/DecoderInterface.php b/src/Symfony/Component/Serializer/Encoder/DecoderInterface.php
index 9dd336d5f7857..9bd5fcbe1692e 100644
--- a/src/Symfony/Component/Serializer/Encoder/DecoderInterface.php
+++ b/src/Symfony/Component/Serializer/Encoder/DecoderInterface.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Serializer\Encoder;
 
+use Symfony\Component\Serializer\Exception\UnexpectedValueException;
+
 /**
  * Defines the interface of decoders
  *
@@ -31,6 +33,8 @@ interface DecoderInterface
      * phpdoc comment.
      *
      * @return mixed
+     *
+     * @throws UnexpectedValueException
      */
     public function decode($data, $format, array $context = array());
 
diff --git a/src/Symfony/Component/Serializer/Encoder/EncoderInterface.php b/src/Symfony/Component/Serializer/Encoder/EncoderInterface.php
index 2290db7f50d85..b928b165294bb 100644
--- a/src/Symfony/Component/Serializer/Encoder/EncoderInterface.php
+++ b/src/Symfony/Component/Serializer/Encoder/EncoderInterface.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Serializer\Encoder;
 
+use Symfony\Component\Serializer\Exception\UnexpectedValueException;
+
 /**
  * Defines the interface of encoders
  *
@@ -26,6 +28,8 @@ interface EncoderInterface
      * @param array  $context options that normalizers/encoders have access to.
      *
      * @return scalar
+     *
+     * @throws UnexpectedValueException
      */
     public function encode($data, $format, array $context = array());
 
diff --git a/src/Symfony/Component/Serializer/Encoder/JsonDecode.php b/src/Symfony/Component/Serializer/Encoder/JsonDecode.php
index f8dfab35a8894..e649bffff9e3a 100644
--- a/src/Symfony/Component/Serializer/Encoder/JsonDecode.php
+++ b/src/Symfony/Component/Serializer/Encoder/JsonDecode.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Serializer\Encoder;
 
+use Symfony\Component\Serializer\Exception\UnexpectedValueException;
+
 /**
  * Decodes JSON data
  *
@@ -33,6 +35,7 @@ class JsonDecode implements DecoderInterface
     private $recursionDepth;
 
     private $lastError = JSON_ERROR_NONE;
+
     protected $serializer;
 
     /**
@@ -52,6 +55,8 @@ public function __construct($associative = false, $depth = 512)
      *
      * @return integer
      *
+     * @deprecated since 2.5, decode() throws an exception if error found, will be removed in 3.0
+     *
      * @see http://php.net/manual/en/function.json-last-error.php json_last_error
      */
     public function getLastError()
@@ -82,6 +87,8 @@ public function getLastError()
      *
      * @return mixed
      *
+     * @throws UnexpectedValueException
+     *
      * @see http://php.net/json_decode json_decode
      */
     public function decode($data, $format, array $context = array())
@@ -98,7 +105,9 @@ public function decode($data, $format, array $context = array())
             $decodedData = json_decode($data, $associative, $recursionDepth);
         }
 
-        $this->lastError = json_last_error();
+        if (JSON_ERROR_NONE !== $this->lastError = json_last_error()) {
+            throw new UnexpectedValueException(JsonEncoder::getLastErrorMessage());
+        }
 
         return $decodedData;
     }
diff --git a/src/Symfony/Component/Serializer/Encoder/JsonEncode.php b/src/Symfony/Component/Serializer/Encoder/JsonEncode.php
index 4e0de3ed75890..5869f969c09f9 100644
--- a/src/Symfony/Component/Serializer/Encoder/JsonEncode.php
+++ b/src/Symfony/Component/Serializer/Encoder/JsonEncode.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Serializer\Encoder;
 
+use Symfony\Component\Serializer\Exception\UnexpectedValueException;
+
 /**
  * Encodes JSON data
  *
@@ -27,10 +29,12 @@ public function __construct($bitmask = 0)
     }
 
     /**
-     * Returns the last encoding error (if any)
+     * Returns the last encoding error (if any).
      *
      * @return integer
      *
+     * @deprecated since 2.5, encode() throws an exception if error found, will be removed in 3.0
+     *
      * @see http://php.net/manual/en/function.json-last-error.php json_last_error
      */
     public function getLastError()
@@ -48,7 +52,10 @@ public function encode($data, $format, array $context = array())
         $context = $this->resolveContext($context);
 
         $encodedJson = json_encode($data, $context['json_encode_options']);
-        $this->lastError = json_last_error();
+
+        if (JSON_ERROR_NONE !== $this->lastError = json_last_error()) {
+            throw new UnexpectedValueException(JsonEncoder::getLastErrorMessage());
+        }
 
         return $encodedJson;
     }
diff --git a/src/Symfony/Component/Serializer/Encoder/JsonEncoder.php b/src/Symfony/Component/Serializer/Encoder/JsonEncoder.php
index 95dae7c8c6674..78f2e945e9bcc 100644
--- a/src/Symfony/Component/Serializer/Encoder/JsonEncoder.php
+++ b/src/Symfony/Component/Serializer/Encoder/JsonEncoder.php
@@ -40,6 +40,8 @@ public function __construct(JsonEncode $encodingImpl = null, JsonDecode $decodin
      * Returns the last encoding error (if any)
      *
      * @return integer
+     *
+     * @deprecated since 2.5, JsonEncode throws exception if an error is found, will be removed in 3.0
      */
     public function getLastEncodingError()
     {
@@ -50,6 +52,8 @@ public function getLastEncodingError()
      * Returns the last decoding error (if any)
      *
      * @return integer
+     *
+     * @deprecated since 2.5, JsonDecode throws exception if an error is found, will be removed in 3.0
      */
     public function getLastDecodingError()
     {
@@ -87,4 +91,31 @@ public function supportsDecoding($format)
     {
         return self::FORMAT === $format;
     }
+
+    /**
+     * Resolves json_last_error message.
+     *
+     * @return string
+     */
+    public static function getLastErrorMessage()
+    {
+        if (function_exists('json_last_error_msg')) {
+            return json_last_error_msg();
+        }
+
+        switch (json_last_error()) {
+            case JSON_ERROR_DEPTH:
+                return 'Maximum stack depth exceeded';
+            case JSON_ERROR_STATE_MISMATCH:
+                return 'Underflow or the modes mismatch';
+            case JSON_ERROR_CTRL_CHAR:
+                return 'Unexpected control character found';
+            case JSON_ERROR_SYNTAX:
+                return 'Syntax error, malformed JSON';
+            case JSON_ERROR_UTF8:
+                return 'Malformed UTF-8 characters, possibly incorrectly encoded';
+            default:
+                return 'Unknown error';
+        }
+    }
 }