JavaScript object notation is like
var car = {name:"Benz", "Brand": "Mercedes", model:"open roof"};
if we need to add the price of the Benz car then the code is as follows.
Example
<html>
<body>
<p id="demo"></p>
<script>
var car = {name:"Benz", "Brand": "Mercedes", model:"open roof"};
car.price = "50,000$",
car.color = "Black"
document.write(JSON.stringify(car));
</script>
</body>
</html>Output
{"name":"Benz","Brand":"Mercedes","model":"open roof","price":"50,000$","color":"Black"}