JavaScript JSON stringify() Method

Last Updated : 14 Mar, 2024

The JSON.stringify() method in JavaScript is used to convert JavaScript objects into a JSON string. This method takes a JavaScript object as input and returns a JSON-formatted string representing that object.

Syntax:

JSON.stringify(value, replacer, space);

Parameters:

value: It is the value that is to be converted into a JSON string.
replacer: It is an optional parameter. This parameter value can be an altering function or an array used as a selected filter for the stringify. If the value is empty or null then all properties of an object are included in a string.
space: It is also an optional parameter. This argument is used to control spacing in the final string generated using the JSON.stringify() function. It can be a number or a string if it is a number then the specified number of spaces are indented to the final string and if it is a string then that string is (up to 10 characters) used for indentation.

Return Value: Returns a string for a given value.

JavaScript JSON stringify() Method Examples

Example 1: Converting JavaScript Object to JSON String

The code demonstrates how to convert a JavaScript object obj into a JSON string using JSON.stringify(). The resulting JSON string represents the properties of the object in a serialized format.

JavaScript

const value = {     Company: "GeeksforGeeks",     Estd: 2009,     location: "Noida" }; const result = JSON.stringify(value); console.log("value of result = " + result);

Output

value of result = {"Company":"GeeksforGeeks","Estd":2009,"location":"Noida"}

Example 2: Deep Copying JavaScript Object with JSON.stringify() and JSON.parse()

The code creates an object obj with nested properties. JSON.stringify() converts obj to a JSON string, then JSON.parse() parses it back to an object obj2. Modifying obj2 doesn’t affect obj, illustrating deep copying.

JavaScript

let obj = {     name: "GFG",     add: {         country: "India",         state: {             code: "JS",             topic: "stringify"         }     } }  let obj2 = JSON.parse(JSON.stringify(obj)); obj2.add.state.topic = "stringify json object"; console.log(obj); console.log(obj2);

Output

{   name: 'GFG',   add: { country: 'India', state: { code: 'JS', topic: 'stringify' } } } {   name: 'GFG',   add: {     country: 'India',     state: { code: 'JS', topic: 'stringify json object' }   } ...

Example 3: Converting Array to JSON String

The code converts the array value into a JSON string using JSON.stringify(). The resulting string result is logged along with its type. This demonstrates how JSON.stringify() converts JavaScript data types into JSON strings.

JavaScript

let value = ["Logan", 21, "Peter", 24]; let result = JSON.stringify(value); console.log("value of result = " + result); console.log("type of result = " + typeof result);

Output

value of result = ["Logan",21,"Peter",24] type of result = string

We have a complete list of Javascript JSON methods, to check those please go through Javascript JSON Complete Reference article.

Supported browsers:

Chrome 4.0
Firefox 3.5
Microsoft Edge 12.0
Opera 11.0
Internet Explorer 8.0
Safari 4.0

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