Mock Service Worker 🇺🇦

Industry standard API mocking for JavaScript.

[Mock Service Worker 🇺🇦 @ApiMocking]

The next chapter of MSW is here!

[Artem Zakharchenko @kettanaito]

I'm excited to announce MSW v3.0! 🥳

- Leaner dependency graph and smaller size;
- ESM-only;
- Granular entrypoints;
- GraphQL subscriptions;
- Socket-based network interception in Node.js;
- And much more!

https://t.co/EhypS9cuT2

[Artem Zakharchenko @kettanaito]

It surprises me how many developers miss the point that you can (and should) generate your handlers in MSW from actual API contracts, like OpenAPI! That *is* the way to drift-free mocking.

Please spread the word: https://t.co/Sj0ArA6pOa

Thank you.

[Artem Zakharchenko @kettanaito]

I am beyond thrilled to welcome @beehiiv as MSW partner! Their support makes sure I can keep working on better API mocking for everyone. Thank you ❤️

[Artem Zakharchenko @kettanaito]

Integrating MSW into Vite-based projects has become silly simple with the new "msw/vite" plugin! And yes, this works with Vitest, too.

The plugin integrates MSW client and server-side and keeps the worker script up-to-date for you, automatically.

[Artem Zakharchenko @kettanaito]

Realized I forgot to add the GraphQL subscriptions docs 🤦‍♂️ Injustice fixed. I present to you the beauty which is mocking GraphQL subscriptions: https://t.co/9JDnUlS67c

[Mock Service Worker 🇺🇦 @ApiMocking]

Help shape the future of API mocking on the web.

[Artem Zakharchenko @kettanaito]

With MSW 3.0 released this week, I want to try something new to make the project financially sustainable. I wrote an open letter about the project, its history, and impact on the ecosystem.

I ask for five minutes of your time to read it. Thank you.
https://t.co/CN1ZzLp9Ey

[Mock Service Worker 🇺🇦 @ApiMocking]

@SantoshYadavDev @leodev ❤️

[Artem Zakharchenko @kettanaito]

Come learn tips and tricks of efficient component testing in Vitest from me next week!

- Learn how JSDOM works under the hood.
- Migrate your tests from JSDOM to Vitest.
- Discover how Vitest replaces RTL.

Get your tickets 👇

https://t.co/LnjzrMi11t

[Artem Zakharchenko @kettanaito]

You don't have to sponsor to help.

Consider nominating MSW for the Open Source Endowement fund: https://t.co/kQzN6rTD9n

Thank you!

[Mock Service Worker 🇺🇦 @ApiMocking]

MSW has changed the way everybody mocks their APIs. Please help us make the project sustainable.

[Artem Zakharchenko @kettanaito]

I am losing roughly $800 a month by working on MSW full-time while it's one of the most used projects in the ecosystem. Please, if MSW provides you any value, consider becoming a sponsor. I mean it when I say every contribution counts.

Thank you ❤️

https://t.co/nCoZwQaOHD

[Artem Zakharchenko @kettanaito]

Come learn component testing from me in person! Accessibility-first, beautifully set up, and running in a real browser with Vitest. One of my best selling workshops on Epic Web now live.

📆 October 5th, 9:00
🇨🇿 Prague

More info: https://t.co/LnjzrMi11t

[Artem Zakharchenko @kettanaito]

MSW add-on for Storybook is downloaded 1,539,807 times per week! That makes it one of the most used add-ons in the entire Storybook ecosystem. Pretty wild.

And with the latest release, it's the best way to mock the network in your stories, too.

https://t.co/HRBtOpUhsi

[Artem Zakharchenko @kettanaito]

If you let your agent write component tests for you, you're in BIG trouble. Why? Because agents were trained on prehistoric tests still using JSDOM.

Yikes 🤢

Join me on 📆 October 5th in 🇨🇿 Prague for a live workshop to learn component testing in the real browser with Vitest.

[Mock Service Worker 🇺🇦 @ApiMocking]

Thank you, Forbes.

[Artem Zakharchenko @kettanaito]

I never got to properly thank Forbes for compiling an annual list of companies using MSW. I'm not sure why they stopped at 500, but I'm still grateful!

[Artem Zakharchenko @kettanaito]

No way.

[Artem Zakharchenko @kettanaito]

Just got MSW CI builds from 10m to 1m thanks to @useblacksmith. Absolutely insane, look at this.

Also a significant boost after migrating most tests from Playwright to Vitest Browser Mode. It proves times faster for me in every project.

[Artem Zakharchenko @kettanaito]

Hold on, what if...?

[Artem Zakharchenko @kettanaito]

MSW hits another big milestone: 200,000 repositories on GitHub depend on it for their tests and development. Thank you for choosing tools made with care ❤️

[Artem Zakharchenko @kettanaito]

May I have 1 minute of your time?

You will not regret it. This is THE testing video I want you all to see. Might be hands-down the best video I've ever recorded.

[Artem Zakharchenko @kettanaito]

Huge news to Storybook developers using MSW: version 3.0 of our add-on has just been released! 🎉

https://t.co/HRBtOpUhsi

This brings a new architecture to support both CSF3 and CSF4, fix some long-standing issues, become dependency-free, and a ton more.