diff --git a/README.md b/README.md
index ef2b56a..443561f 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ A PHP library with a variety of string manipulation functions with multibyte sup
     * [isAlphanumeric](#isalphanumeric)
     * [isBlank](#isblank)
     * [isHexadecimal](#ishexadecimal)
+    * [isJson](#isjson)
     * [isLowerCase](#islowercase)
     * [isSerialized](#isserialized)
     * [isUpperCase](#isuppercase)
@@ -352,6 +353,19 @@ S::create('A102F')->isHexadecimal();
 S::isHexadecimal('A102F');  // true
 ```
 
+#### isJson
+
+$stringy->isJson()
+
+S::isJson(string $str [, string $encoding ])
+
+Returns true if the string is JSON, false otherwise.
+
+```php
+S::create('{"foo":"bar"}')->isJson();
+S::isJson('{"foo":"bar"}');  // true
+```
+
 #### isLowerCase
 
 $stringy->isLowerCase()
diff --git a/src/Stringy/StaticStringy.php b/src/Stringy/StaticStringy.php
index fd3a49f..013aafd 100644
--- a/src/Stringy/StaticStringy.php
+++ b/src/Stringy/StaticStringy.php
@@ -624,6 +624,18 @@ class StaticStringy
         return Stringy::create($str, $encoding)->isBlank();
     }
 
+    /**
+     * Returns true if the string is JSON, false otherwise.
+     *
+     * @param   string   $str       String to check
+     * @param   string   $encoding  The character encoding
+     * @return  bool     Whether or not $str is JSON
+     */
+    public static function isJson($str, $encoding = null)
+    {
+        return Stringy::create($str, $encoding)->isJson();
+    }
+
     /**
      * Returns true if the string contains only lower case chars, false otherwise.
      *
diff --git a/src/Stringy/Stringy.php b/src/Stringy/Stringy.php
index 9c0b52b..cf5f03d 100644
--- a/src/Stringy/Stringy.php
+++ b/src/Stringy/Stringy.php
@@ -1002,6 +1002,21 @@ class Stringy
         return $this->matchesPattern('^([[:space:]])*$');
     }
 
+    /**
+     * Returns true if the string is JSON, false otherwise.
+     *
+     * @return  bool  Whether or not $str is JSON
+     */
+    public function isJson()
+    {
+        if (!$this->endsWith('}') && !$this->endsWith(']')) {
+            return false;
+        }
+
+        return !is_null(json_decode($this->str));
+    }
+
+
     /**
      * Returns true if the string contains only lower case chars, false otherwise.
      *
diff --git a/tests/Stringy/CommonTest.php b/tests/Stringy/CommonTest.php
index ccd43f1..9778c70 100644
--- a/tests/Stringy/CommonTest.php
+++ b/tests/Stringy/CommonTest.php
@@ -766,6 +766,28 @@ abstract class CommonTest extends PHPUnit_Framework_TestCase
         return $testData;
     }
 
+    public function stringsForIsJson()
+    {
+        $testData = array(
+            array(false, ''),
+            array(false, '123'),
+            array(true, '{"foo": "bar"}'),
+            array(false, '{"foo":"bar",}'),
+            array(false, '{"foo"}'),
+            array(true, '["foo"]'),
+            array(false, '{"foo": "bar"]'),
+            array(false, '123', 'UTF-8'),
+            array(true, '{"fòô": "bàř"}', 'UTF-8'),
+            array(false, '{"fòô":"bàř",}', 'UTF-8'),
+            array(false, '{"fòô"}', 'UTF-8'),
+            array(false, '["fòô": "bàř"]', 'UTF-8'),
+            array(true, '["fòô"]', 'UTF-8'),
+            array(false, '{"fòô": "bàř"]', 'UTF-8'),
+        );
+
+        return $testData;
+    }
+
     public function stringsForIsLowerCase()
     {
         $testData = array(
diff --git a/tests/Stringy/StaticStringyTest.php b/tests/Stringy/StaticStringyTest.php
index 1287102..ca17595 100644
--- a/tests/Stringy/StaticStringyTest.php
+++ b/tests/Stringy/StaticStringyTest.php
@@ -471,6 +471,16 @@ class StaticStringyTestCase extends CommonTest
         $this->assertInternalType('boolean', $result);
         $this->assertEquals($expected, $result);
     }
+    
+    /**
+     * @dataProvider stringsForIsJson
+     */
+    public function testIsJson($expected, $str, $encoding = null)
+    {
+        $result = S::isJson($str, $encoding);
+        $this->assertInternalType('boolean', $result);
+        $this->assertEquals($expected, $result);
+    }
 
     /**
      * @dataProvider stringsForIsLowerCase
diff --git a/tests/Stringy/StringyTest.php b/tests/Stringy/StringyTest.php
index a4353a6..0397dfc 100644
--- a/tests/Stringy/StringyTest.php
+++ b/tests/Stringy/StringyTest.php
@@ -556,6 +556,18 @@ class StringyTestCase extends CommonTest
         $this->assertEquals($str, $stringy);
     }
 
+    /**
+     * @dataProvider stringsForIsJson
+     */
+    public function testIsJson($expected, $str, $encoding = null)
+    {
+        $stringy = S::create($str, $encoding);
+        $result = $stringy->isJson();
+        $this->assertInternalType('boolean', $result);
+        $this->assertEquals($expected, $result);
+        $this->assertEquals($str, $stringy);
+    }
+
     /**
      * @dataProvider stringsForIsLowerCase
      */