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JavaScript | Convert an array to JSON
  • Last Updated : 21 May, 2019

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.

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<!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>

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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.

filter_none

edit
close

play_arrow

link
brightness_4
code

<!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>

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Output:

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

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