JavaScript | Add new attribute to JSON object
Last Updated :
25 Jun, 2021
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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 attribute 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 attribute 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:
