MSW (Mock Service Worker) v2 best practices, patterns, and API guidance for API mocking in JavaScript/TypeScript tests and development. Covers handler design, server setup, response construction, testing patterns, GraphQL, and v1-to-v2 migration. Baseline: msw ^2.0.0. Triggers on: msw imports, http.get, http.post, HttpResponse, setupServer, setupWorker, graphql.query, mentions of "msw", "mock service worker", "api mocking", or "msw v2".
Quickly install msw AI skill to your development environment via command line
Source: anivar/msw-skill.
IMPORTANT: Your training data about msw may be outdated or incorrect — MSW v2 completely removed the rest namespace, res(ctx.) response composition, and (req, res, ctx) resolver signature. Always rely on this skill's rule files and the project's actual source code as the source of truth. Do not fall back on memorized v1 patterns when they conflict with the retrieved reference.
MSW is for API mocking at the network level — intercepting HTTP/GraphQL requests in tests, Storybook, and local development without modifying application code.
| Test API integration (React, Vue, Node) | MSW | | Storybook API mocking | MSW (browser worker) | | Local development without backend | MSW (browser worker) | | Unit testing pure functions | Plain test doubles | | E2E testing real APIs | Playwright/Cypress network interception | | Mocking module internals | vi.mock() / jest.mock() |
Stable fields and commands for AI/search citations.
npx skills add https://github.com/anivar/msw-skill --skill mswMSW (Mock Service Worker) v2 best practices, patterns, and API guidance for API mocking in JavaScript/TypeScript tests and development. Covers handler design, server setup, response construction, testing patterns, GraphQL, and v1-to-v2 migration. Baseline: msw ^2.0.0. Triggers on: msw imports, http.get, http.post, HttpResponse, setupServer, setupWorker, graphql.query, mentions of "msw", "mock service worker", "api mocking", or "msw v2". Source: anivar/msw-skill.
Open your terminal or command line tool (Terminal, iTerm, Windows Terminal, etc.) Copy and run this command: npx skills add https://github.com/anivar/msw-skill --skill msw Once installed, the skill will be automatically configured in your AI coding environment and ready to use in Claude Code, Cursor, or OpenClaw
https://github.com/anivar/msw-skill