MSW Has a Free API You're Not Using

Mock Service Worker (MSW) intercepts HTTP requests at the network level, giving you a complete API mocking solution that works in both browser and Node.js. Most developers only use it for basic request mocking. What is MSW? MSW intercepts requests using a Service Worker in the browser and custom interceptors in Node.js. Your application code makes real HTTP requests — MSW handles them before they leave your machine. The Free APIs You're Missing 1. http.all() — Catch-All Request Handler import { http , HttpResponse } from " msw " ; export const handlers = [ http . all ( " */api/* " , ({ request }) => { console . log ( ` ${ request . method } ${ request . url } ` ); return HttpResponse . json ( { error : " Not mocked yet " }, { status : 501 } ); }), ]; Catch unmocked API calls during development. No more silent failures. 2. Network Behavior — Simulate Real Network Conditions import { http , HttpResponse , delay } from " msw " ; export const handlers = [ http . get ( " /api/data " , async