JavaScript | Add new attribute to JSON object

The task is to add a JSON attribute to the JSON object. To do so, Here are a few of the most used techniques discussed.

Example 1: This example adds a prop_11 attibute to the myObj object via var key.

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <title> 
        JavaScript  
      | Add new attribute to JSON object. 
    </title> 
</head> 
  
<body style="text-align:center;"
      id="body"> 
    <h1 style="color:green;">   
            GeeksForGeeks   
        </h1> 
    <p id="GFG_UP"
       style="font-size: 16px; 
              font-weight: bold;"> 
  
    </p> 
    <button onclick="gfg_Run()"> 
        Click here 
    </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 myObj = { 
            'prop_1': { 
                'prop_12': 'value_12' 
            } 
        }; 
        el_up.innerHTML = JSON.stringify(myObj); 
  
        function gfg_Run() { 
            var key = "prop_11"; 
            myObj.prop_1[key] = "value_11"; 
            el_down.innerHTML = JSON.stringify(myObj); 
        } 
    </script> 
</body> 
  
</html> 

Output:

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

Example 2: This example adds a prop_11 attibute to the myObj with value value_11.

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <title> 
        JavaScript 
      | Add new attribute to JSON object. 
    </title> 
</head> 
  
<body style="text-align:center;"
      id="body"> 
    <h1 style="color:green;">   
            GeeksForGeeks   
        </h1> 
    <p id="GFG_UP"
       style="font-size: 16px; 
              font-weight: bold;"> 
  
    </p> 
    <button onclick="gfg_Run()"> 
        Click here 
    </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 myObj = { 
            'prop_1': { 
                'prop_12': 'value_12' 
            } 
        }; 
        el_up.innerHTML = JSON.stringify(myObj); 
  
        function gfg_Run() { 
            myObj.prop_1["prop_11"] = "value_11"; 
            el_down.innerHTML = JSON.stringify(myObj); 
        } 
    </script> 
</body> 
  
</html> 

Output:

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

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