JavaScript (ES2026) reference · Object Methods

JavaScript Object.getOwnPropertyDescriptor() Method

Return the descriptor (value, writable, enumerable, configurable or get/set) of one own property.

JavaScript (ES2026) Since ES5

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Syntax

Object.getOwnPropertyDescriptor(obj, prop)

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

A descriptor object, or undefined.

A normal propertyTry it yourself

console.log(Object.getOwnPropertyDescriptor({ a: 1 }, "a"));

Output

{ value: 1, writable: true, enumerable: true, configurable: true }

A frozen propertyTry it yourself

const o = Object.freeze({ a: 1 });
console.log(Object.getOwnPropertyDescriptor(o, "a"));

Output

{ value: 1, writable: false, enumerable: true, configurable: false }

Version	Change
JavaScript ES5	Added

Object.defineProperty() · Add or change one property with full control over whether it is writable, enumerable and configurable, or define a getter.
Object.getOwnPropertyNames() · Return all own string property names, including non-enumerable ones that Object.keys() skips.
JavaScript Objects · tutorial