Object.keys
Returns an array of a given object's own enumerable string-keyed property names
Syntax
Object.keys(obj)Parameters
| Parameter | Type | Description |
|---|---|---|
| obj | object | The object whose enumerable own properties are to be returned |
Return Value
An array of strings representing the object's own enumerable properties
Examples
const obj = { a: 1, b: 2, c: 3 };
console.log(Object.keys(obj)); // ['a', 'b', 'c']const user = { name: 'Alice', age: 30, email: '[email protected]' };
Object.keys(user).forEach(key => {
console.log(key);
});
// name, age, emailconst arr = ['x', 'y', 'z'];
console.log(Object.keys(arr)); // ['0', '1', '2']Understanding Object.keys
The Object.keys method in JavaScript returns an array of a given object's own enumerable string-keyed property names. It belongs to the Object object and is one of the most widely used methods for working with object values in modern JavaScript and TypeScript applications.
The method signature is Object.keys(obj). It accepts 1 parameter: obj. When called, it returns an array of strings representing the object's own enumerable properties. Understanding when and how to use keys() helps you write more expressive, readable code.
Common use cases for Object.keys include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like object-values, object-entries, object-getownpropertynames, enabling you to chain operations together for complex data manipulation pipelines.
Browser support for Object.keys 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.
Browser Compatibility
Supported in all modern browsers (Chrome, Firefox, Safari, Edge) and Node.js. Part of the ECMAScript standard.
Related Methods
Object.valuesReturns an array of a given object's own enumerable string-keyed property values
Object.entriesReturns an array of a given object's own enumerable string-keyed property key-value pairs
Object.getOwnPropertyNamesReturns an array of all properties (including non-enumerable) found directly in a given object
More Object Methods
Other methods in the Object object
Related Tools
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