In this article, We’ll see how to check a key exist or not in json?

before see the example, we’ll read about hasOwnProperty method and why we use hasOwnProperty method.

hasOwnProperty() method returns a boolean indicating whether the object has the specified property as its own property (as opposed to inheriting it).

To check the key exist or not in json, we’ll use hasOwnProperty() method.

	var json =  {"tutorial": "nexladder web tutorials"};
	if (json.hasOwnProperty('tutorial'))
	console.log("Key exist");
	 else
	console.log("Key not exist");
	//Output Key exist

	var json =  {"tutorial": "nexladder web tutorials"};
	if (json.hasOwnProperty('webtutorial'))
	console.log("Key exist");
	 else
	console.log("Key not exist");
	//Output Key not exist

That’s it!. Please share your thoughts or suggestions in the comments below.