JavaScript - add method to existing object

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In this article, we would like to show you how to add method to the existing object in JavaScript.

Quick solution:

// ONLINE-RUNNER:browser;

const object = {}

// add method to object
object.methodName = function () {
    console.log('Some action...');

object.methodName(); // Some action...


Practical example

In this example, we add a method that displays our user object full name.

// ONLINE-RUNNER:browser;

const user = {
    id: 1,
    name: 'Tom',
    surname: 'Smith',

// add method to user object
user.getFullName = function () {
    console.log( + ' ' + this.surname)

user.getFullName(); // Tom Smith


Tom Smith
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