Loop or Iterate over an Object in JavaScript

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In this post, I show you three different ways to loop or iterate over an Object in JavaScript.

3 Ways to Loop an Object in JavaScript

1. Using Object.keys() Method

var user = { firstName: 'Ramesh', lastName: 'Fadatare', emailId: 'ramesh@gmail.com', age: 29 } const keys = Object.keys(user) console.log(keys) // [apple, orange, pear] for (const key of keys) { console.log(" key :: " + key); console.log(" value :: " + user[key]); }

Output:

key :: firstName value :: Ramesh key :: lastName value :: Fadatare key :: emailId value :: ramesh@gmail.com key :: age value :: 29

2. Using Object.entries() Method

var user = { firstName: 'Ramesh', lastName: 'Fadatare', emailId: 'ramesh@gmail.com', age: 29 } const entries = Object.entries(user) for (const [key, value] of entries) { console.log(`Key Value Pair -> ${key} ${value}`) }

Output:

Key Value Pair -> firstName Ramesh Key Value Pair -> lastName Fadatare Key Value Pair -> emailId ramesh@gmail.com Key Value Pair -> age 29

3. Using Object.hasOwnProperty() Method

var user = { firstName: 'Ramesh', lastName: 'Fadatare', emailId: 'ramesh@gmail.com', age: 29 } for (var key in user) { if (user.hasOwnProperty(key)) { console.log(key + " -> " + user[key]); } }

Output:

firstName -> Ramesh lastName -> Fadatare emailId -> ramesh@gmail.com age -> 29

Reference

https://www.javaguides.net/2019/06/javascript-objectkeys-method-example.html

https://www.javaguides.net/2019/05/javascript-utility-methods.html

https://www.javaguides.net/2019/06/javascript-objectentries-method-example.html