JavaScript JSON parse() Method

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

Syntax:

JSON.parse( string, function )

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

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

Return Value: This method returns an object corresponding to the given JSON text.

Example 1: Below is an example of the JSON parse() Method.

JavaScript

let obj = JSON.parse('{"var1":"Geeks","var2":"forGeeks!"}');
 
console.log(obj.var1 + " " + obj.var2);

Output:

zambiatek!

Example 2: This example parses a string and returns the JavaScript object.

Javascript

let obj = JSON.parse('{"var1":"Hello","var2":"Geeks!"}');
 
console.log(obj.var1 + " " + obj.var2);

Output

Hello Geeks!

Example 3: This example uses the reviver function to parse a string and return the JavaScript object.

Javascript

let text = '{ "var1":"Amanda", "gender":"male"}';
 
let obj = JSON.parse(text, function (key, value) {
    if (value == "male") {
        return ("female");
    } else {
        return value;
    }
});
console.log(obj.var1 + ", " + obj.gender);