JavaScript JSON parse() Method

Last Updated : 07 Jul, 2020

Below is the example of the JSON parse() Method.

Example:

<script>
        var obj = JSON.parse('{"var1":"Geeks", 
                               "var2":"forGeeks!"}');
          
        document.write(obj.var1 + "" + obj.var2);
</script>                    

Output:
```
GeeksforGeeks!
```

The JSON.parse() method in JavaScript is used to parse a JSON string which is written in a JSON format and return a JavaScript object.

Syntax:

JSON.parse( string, function )

Parameters: This method accepts two parameter as mentioned above and described below:

string: It is required parameter and it contains string which is written in JSON format.
function: It is optional parameter and used to transform result. The function called for each item.

More example codes for the above method are as follows:

Example 1: This example parse a string and return the JavaScript object.

<!DOCTYPE html>
<html>
  
<head>
    <title>
        JavaScript JSON parse() Method
    </title>
</head>
  
<body>
      
    <h1>GeeksforGeeks</h1>
      
    <h2>
        JavaScript JSON parse() Method
    </h2>
      
    <p id="GFG"></p>
      
    <!-- Script to parse a string and return
        JavaScript object -->
    <script>
        var obj = JSON.parse('{"var1":"Hello", 
                               "var2":"Geeks!"}');
          
        document.getElementById("GFG").innerHTML
                = obj.var1 + " " + obj.var2;
    </script>
</body>
  
</html>                    

Output:

Example 2: This example use reviver function to parse a string and return the JavaScript object.

<!DOCTYPE html>
<html>
  
<head>
    <title>
        JavaScript JSON parse() Method
    </title>
</head>
  
<body>
      
    <h1>GeeksforGeeks</h1>
      
    <h2>
        JavaScript JSON parse() Method
    </h2>
      
    <p id="GFG"></p>
      
    <!-- Script to parse a string and return
        JavaScript object -->
    <script>
        var text = '{ "var1":"Amanda", "gender":"male"}';
          
        var obj = JSON.parse(text, function (key, value) {
            if (value == "male") {
                return ("female");
            } else {
                return value;
            }
        });
        document.getElementById("GFG").innerHTML
                = obj.var1 + ", " + obj.gender; 
    </script>
</body>
  
</html>                    

Output:

Supported browsers:

Chrome 4.0
Firefox 3.5
Opera 11.0
Internet Explorer 8.0
Safari 4.0

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