Reflect

`Reflect.ownKeys`

Returns an array of the target object's own property keys including non-enumerable and symbol properties

Syntax

JavaScript

Reflect.ownKeys(target)

Parameters

Parameter	Type	Description
target	object	The target object to get the keys from

Return Value

An Array of the target's own property keys (strings and symbols)

Examples

Basic Usage

const obj = { a: 1, b: 2 }
const sym = Symbol('c')
;(obj as any)[sym] = 3
console.log(Reflect.ownKeys(obj)) // ['a', 'b', Symbol(c)]

Practical Example

const obj = Object.create(null, {
  visible: { value: 1, enumerable: true },
  hidden: { value: 2, enumerable: false }
})
console.log(Reflect.ownKeys(obj)) // ['visible', 'hidden']

Advanced Usage

function getAllKeys(obj: object): (string | symbol)[] {
  return Reflect.ownKeys(obj)
}

Understanding Reflect.ownKeys

The Reflect.ownKeys method in JavaScript returns an array of the target object's own property keys including non-enumerable and symbol properties. It belongs to the Reflect object and is one of the most widely used methods for working with reflect values in modern JavaScript and TypeScript applications.

The method signature is Reflect.ownKeys(target). It accepts 1 parameter: target. When called, it returns an array of the target's own property keys (strings and symbols). Understanding when and how to use ownKeys() helps you write more expressive, readable code.

Common use cases for Reflect.ownKeys include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like reflect-has, reflect-get, object-keys, enabling you to chain operations together for complex data manipulation pipelines.

Browser support for Reflect.ownKeys is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.