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Updated 37 min ago
Mock Service Worker

Organization

Public GitHub footprint of Mock Service Worker

@mswjs
View profile on GitHub

Industry standard API mocking for JavaScript.

25

Public repositories

21,935

Total stars

471

Followers

The GitHub presence of mswjs, the organization behind Mock Service Worker, showcases a wide range of repositories primarily focused on API mocking for JavaScript. Utilizing TypeScript and JavaScript, their notable projects include msw, a standard for API mocking, and data, a library for querying data in testing environments.

Top languages

TypeScript 20JavaScript 1Shell 1

Public repositories

msw

17,972

Industry standard API mocking for JavaScript.

TypeScript
Updated Jun 13, 2026

data

1,025

Data querying library for testing JavaScript applications.

TypeScript
Updated Jun 11, 2026

examples

727

Examples of Mock Service Worker usage with various frameworks and libraries.

Unknown Language
Updated May 26, 2026

interceptors

656

Low-level network interception library.

TypeScript
Updated Jun 8, 2026

msw-storybook-addon

484

Mock API requests in Storybook with Mock Service Worker.

TypeScript
Updated Jun 12, 2026

playwright

262

Mock APIs in Playwright using Mock Service Worker.

TypeScript
Updated Jun 11, 2026

source

215

Generate MSW request handlers from various sources (HAR files, OpenAPI documents, etc).

TypeScript
Updated Jun 9, 2026

mswjs.io

175

Official website and documentation for the Mock Service Worker library.

TypeScript
Updated May 7, 2026

http-middleware

124

Spawn an HTTP server from your request handlers or apply them to an existing server using a middleware.

TypeScript
Updated Apr 28, 2026

jest-fixed-jsdom

95

A superset of the JSDOM environment for Jest that respects Node.js globals.

JavaScript
Updated May 26, 2026

cloudflare

55

Develop and test Cloudflare applications with Mock Service Worker.

TypeScript
Updated Jun 12, 2026

headers-polyfill

33

A Fetch API "Headers" polyfill and transformation library.

TypeScript
Updated Mar 5, 2026

node-match-path

29

Matches a URL against a path. Parameters, wildcards, RegExp.

TypeScript
Updated Mar 5, 2026

storage

19

Persistence and live synchronization layer for testing JavaScript applications.

TypeScript
Updated Aug 29, 2025

cookies

19

Manage request/response cookies in the environments where those are not supported.

TypeScript
Updated Jul 10, 2024

socket.io-binding

16

Binding to mock Socket.IO connections with Mock Service Worker.

TypeScript
Updated Mar 20, 2026

is-node-process

12

Reliably determines if the code is running in Node.js. Treats Jest, React Native, Electron, and others like Node.js.

TypeScript
Updated Jul 12, 2024

codemods

5

Automate repetitive and painful MSW migrations & breaking changes.

TypeScript
Updated Sep 23, 2025

gh-issue-forms

4

A test repository that is going to disappear.

Shell
Updated Dec 23, 2022

msw-github-bot

3

Mock Service Worker community bot. Beep. Bop.

TypeScript
Updated May 19, 2022

url

2

Utilities for working with URLs.

TypeScript
Updated Apr 10, 2026

local-storage-polyfill

2

The "localStorage" polyfill for Node.js.

TypeScript
Updated Feb 20, 2025

github-webhooks

1

No description provided for this repository.

TypeScript
Updated Mar 16, 2022

sveltekit

0

No description provided for this repository.

Unknown Language
Updated Jun 4, 2026

.github

0

Mock Service Worker organization GitHub files.

Unknown Language
Updated Sep 29, 2025

Frequently asked questions

What does mswjs build on GitHub?

mswjs builds various projects related to API mocking and testing for JavaScript applications. Their key repositories include msw, which is widely recognized for its API mocking capabilities, and data, a library for data querying in testing.

Which programming languages does mswjs use?

mswjs primarily uses TypeScript and JavaScript for its repositories. This choice of languages aligns with their focus on developing tools and libraries for JavaScript developers, particularly in the realm of API mocking.

Are mswjs's repositories public?

Yes, all of mswjs's repositories on GitHub are public. This transparency allows developers to access, contribute to, and utilize their tools for mocking APIs in various JavaScript frameworks and libraries.

Is this exposure intended?

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