JavaScript JSON stringify() Method
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); |
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); |
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); |
{
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); |
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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