Way To Check If An Object Has Property In Javascript

In this quick tutorial i am going to explain check if an object has a property in javascript. Sometimes in our javascript code we need to check that an object has a property in javascript or not. In this example i will share three ways to check javascript object property. From this lesson you will also learn how to check if an object has a specific property in javascript.

In the first example i will show you hasownproperty with source code:

const language = {
  name: 'react'
};

language.hasOwnProperty('name');     // => true
language.hasOwnProperty('framework'); // => false

language.hasOwnProperty('name') returns true because the property name exists in the object language. Let’s use in operator to detect the existence of name and framework in language object in my second example:

const language = {
  name: 'react'
};

'name' in language;     // => true
'framework' in language; // => false

Read also: How to Do Object Destructuring in JavaScript

Hope it can help you.