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I am thrilled to announce that Workleap has become a new MSW partner 🥳 Thank you for your support! You are making it possible for me to keep working on MSW, improving API mocking for everyone. ❤️

Oy! The devtools.fm episode just dropped! 😍 Come listen to me mumbling about APIs, request interception, and what it looks like being an EpicWeb instructor. This one was so much fun!

Yes, yes there is a way. Talking about it in this video.

If you want to help, I'd be grateful for someone to investigate this memory leak: github.com/mswjs/msw/issu… Guarantees to be a challenge for your debugging skills. Thank you!

Neat, there's an effort to create MSW DevTools as a Chrome extension. Give this a try 👇 chromewebstore.google.com/detail/msw-dev…

Watching Mandalorian for the first time right now, and let me tell you these folks aren't wrong. This is the way.

Now that we have Standard Schema, I'm experimenting with an idea to support an in-memory data storage in MSW. Here's a gist.

Tomorrow! Join Artem Zakharchenko (creator of Mock Service Worker 🇺🇦) and Kyle Gach (DX eng at Storybook) for a live discussion around mocking and UI testing. We'll walk through techniques and leave lots of time to answer your questions. Register here: us02web.zoom.us/webinar/regist…

Today, I invite you to learn the Browser Mode in vitest. Unlock the true value out of your React component tests in the real browser! 📢 A new workshop is OUT at Epic Web. The link below.

Huge thank you to StackBlitz for becoming MSW's golden sponsor ❤️ Your support will help us ship new features and fix bugs. Thank you!

The Testing Bundle by Artem Zakharchenko on Epic Web is on a 25% discount for only a few more days. Don't miss it! epicweb.dev/testing 👈

Good news for Playwright users!

📰 Today, I'm sharing one of my favorite APIs to help you design great test utilities. And to help you understand it, let's talk about flat tests and one glaring issue that they have... epicweb.dev/better-test-se…

More people should check out this repo and this workshop: github.com/epicweb-dev/re… Test your React components in the actual browser with Vitest Browser Mode. This is the way.

I think authentication in E2E tests can be better. That's why I'm building a library called Playwright Persona. Learn what it is, why it exists, and how to use it: github.com/kettanaito/pla… And, please, share your thoughts! 🙏 Thank you.

My preferred React stack for 2025 Package manager: Bun Starter: Vite Language: TypeScript Router: Tanstack Router Remote state: Sync engine like Convex or Zero if possible, Tanstack Query otherwise. Form state: Tanstack Form Global/subtree state: Zustand Unit tests:

. Google is using MSW (Mock Service Worker 🇺🇦) for testing the Gemini CLI! Retweet if you think they'd be a great GitHub Sponsor 👀

📣 Announcing "Advanced Vitest Patterns"! In this workshop, you'll become a vitest superuser by: - Crafting better testing experiences with custom, type-safe fixtures and assertions; - Making your tests more expressive and easier to debug with retryable and soft assertions;

MSW now supports custom predicate functions for your handlers. Express more nuanced matching logic without exhausting your handler. Need to match against a query param? A header? A body chunk? Now you can! (including GraphQL)