JavaScript (ES2026) reference · Object Methods

JavaScript Object.getOwnPropertyNames() Method

Return all own string property names, including non-enumerable ones that Object.keys() skips.

JavaScript (ES2026) Since ES5

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Syntax

Object.getOwnPropertyNames(obj)

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

An array of strings.

Includes non-enumerable lengthTry it yourself

const arr = ["a", "b"];
console.log(Object.keys(arr), Object.getOwnPropertyNames(arr));

Output

[ '0', '1' ] [ '0', '1', 'length' ]

Inspect a built-inTry it yourself

console.log(Object.getOwnPropertyNames(Math).slice(0, 5));

Output

[ 'abs', 'acos', 'acosh', 'asin', 'asinh' ]

Version	Change
JavaScript ES5	Added

Object.keys() · Return an array of an object's own enumerable property names, in insertion order (integer keys first).
Object.getOwnPropertyDescriptor() · Return the descriptor (value, writable, enumerable, configurable or get/set) of one own property.
JavaScript Objects · tutorial