JavaScript | Convert an array to JSON

Namachila October 30, 2025

0 0 1 minute read

Here is a need to convert an array into a JSON_Object. To do so we are going to use a few of the most preferred techniques. First, we need to know a few methods.

1) Object.assign() method
This method copies the values of all properties owned by enumerables from source objects(one or more) to a target object.
Syntax:

Object.assign(target, ...sources)

Parameters:

target: It specifies the target object.
sources: It specifies the source object(s).

2)-JSON.stringify() method
Use of JSON is to exchange data to/from a web server. While sending data to web server, the data need to be string.
This method converts the javascript Object(array in this case) into JSON_string.
Syntax:

JSON.stringify(Javascript Object)

Parameters:

Javascript Object: It specifies the JavaScript object.

Example 1:This example converts the JS array to JSON String using JSON.stringify() method.

<!DOCTYPE html>   
<html>   
    <head>  
        <title>  
            JavaScript | Convert array to JSON. 
        </title> 
    </head>  
    <body style = "text-align:center;" id = "body">   
        <h1 style = "color:green;" >   
            GeeksForGeeks   
        </h1>  
        <p id = "GFG_UP" style = "font-size: 16px;"> 
          
        </p> 
        <button onclick = "gfg_Run()">  
            Convert 
        </button> 
        <p id = "GFG_DOWN" style = "color:green;  
            font-size: 20px; font-weight: bold;"> 
        </p> 
        <script> 
            var el_up = document.getElementById("GFG_UP"); 
            var el_down = document.getElementById("GFG_DOWN"); 
            var array = [34, 24, 31, 48]; 
            el_up.innerHTML = "Array = [" +array+"]";; 
            function gfg_Run(){ 
            el_down.innerHTML = "JSON_String = '"+JSON.stringify(array)+"'";   
            }            
        </script>  
    </body>   
</html> 

Output:

Before clicking on the button:
After clicking on the button:

Example 2:This example converts the JS array to JSON Object using Object.assign() method.

<!DOCTYPE html>   
<html>   
    <head>  
        <title>  
            JavaScript | Convert array to JSON. 
        </title> 
    </head>  
    <body style = "text-align:center;" id = "body">   
        <h1 style = "color:green;" >   
            GeeksForGeeks   
        </h1>  
        <p id = "GFG_UP" style = "font-size: 16px;"> 
          
        </p> 
        <button onclick = "gfg_Run()">  
            Convert 
        </button> 
        <p id = "GFG_DOWN" style = "color:green;  
           font-size: 20px; font-weight: bold;"> 
        </p> 
        <script> 
            var el_up = document.getElementById("GFG_UP"); 
            var el_down = document.getElementById("GFG_DOWN"); 
            var array = [34, 24, 31, 48]; 
            el_up.innerHTML = "Array = [" +array+"]";; 
            function gfg_Run(){ 
            el_down.innerHTML =  
            "JSON Object = "+JSON.stringify(Object.assign({}, array));   
            }            
        </script>  
    </body>   
</html> 