JavaScript (ES2026) reference · Object Methods

JavaScript Object.keys() Method

Return an array of an object's own enumerable property names, in insertion order (integer keys first).

JavaScript (ES2026) Since ES5

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Syntax

Object.keys(obj)

Parameter	Description
`obj`	The object to inspect or change.

An array of strings.

List the keysTry it yourself

const user = { name: "Ada", role: "admin" };
console.log(Object.keys(user), Object.keys(user).length);

Output

[ 'name', 'role' ] 2

Integer-like keys come firstTry it yourself

console.log(Object.keys({ b: 1, 2: "x", a: 2, 1: "y" }));

Output

[ '1', '2', 'b', 'a' ]

Version	Change
JavaScript ES5	Added

Object.values() · Return an array of an object's own enumerable property values, in the same order as Object.keys().
Object.entries() · Return an array of an object's own enumerable [key, value] pairs, ready for for…of loops or array methods.
Object.getOwnPropertyNames() · Return all own string property names, including non-enumerable ones that Object.keys() skips.
JavaScript Objects · tutorial