JavaScript (ES2026) reference · Object Methods

JavaScript Object.hasOwn() Method

Return true if an object has a property of its own (not inherited). The safer replacement for hasOwnProperty().

JavaScript (ES2026) Since ES2022

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Syntax

Object.hasOwn(obj, prop)

Parameters

Parameter	Description
`obj`	The object to inspect or change.
`prop`	The property name.

Return value

true or false.

Examples

Own vs inheritedTry it yourself

const user = { name: "Ada" };
console.log(Object.hasOwn(user, "name"), Object.hasOwn(user, "toString"), "toString" in user);

Output

true false true

Works on null-prototype objectsTry it yourself

const dict = Object.create(null);
dict.key = 1;
console.log(Object.hasOwn(dict, "key"));
// dict.hasOwnProperty("key") would throw: there is no prototype