JavaScript Object.keys()

Use Object.keys() on an array:

const fruits = ["Banana", "Orange", "Apple", "Mango"];
const keys = Object.keys(fruits);

Use Object.keys() on a string:

const fruits = "Banana";
const keys = Object.keys(fruits);

Use Object.keys() on an object:

const person = {
  firstName: "John",
  lastName: "Doe",
  age: 50,
  eyeColor: "blue"
};
const keys = Object.keys(person);

Description

The Object.keys() method returns an Array Iterator object with the keys of an object.

The Object.keys() method does not change the original object.

Object.keys( object)

Parameter	Description
object	Required. An iterable object.

Type	Description
An array	An Array Iterator object containing the keys of an object.

Object.keys() is an ECMAScript6 (ES6) feature.

ES6 (JavaScript 2015) is supported in all modern browsers:


Chrome	Edge	Firefox	Safari	Opera
Yes	Yes	Yes	Yes	Yes

Object.keys() is not supported in Internet Explorer 11 (or earlier).