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JavaScript JSON stringify() Method

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The JSON.stringify() method in JavaScript is used to create a JSON string out of it. While developing an application using JavaScript, many times it is needed to serialize the data to strings for storing the data in a database or for sending the data to an API or web server. The data has to be in the form of strings. This conversion of an object to a string can be easily done with the help of the JSON.stringify() method.

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:

It returns a string for a given value.

Example: 

letvalue = { name: "Logan", age: 21, location: "London" };
letresult = JSON.stringify(value);
Output:
{"name":"Logan", "age":21, "location":"London"}

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

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: In the below code, the JavaScript object is being passed as a value in the function to convert it into a string.

Javascript

let value = {
    name: "Logan",
    age: 21,
    location: "London"
};
let result = JSON.stringify(value);
console.log("value of result = " + result);
console.log("type of result = " + typeof result);

                    

Output
value of result = {"name":"Logan","age":21,"location":"London"}
type of result = string

Example 3: In the below code will look over as it is helpful to convert it into a string without doing changes in the original object so helpful for the nested objects to changes without reflecting in the original object.

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 4: In the below code, the JavaScript array can be passed as a value in the function to convert it into a string.

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


Last Updated : 20 Dec, 2023
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