Hi Product Hunt! 👋 I'm Yessin, the maker of Mock2Block. As a frontend developer, I was spending way too much time wiring up fake Express backends just to test my UI states, pagination, and error boundaries. Existing tools were either too expensive or too simple (just static JSON). I built Mock2Block to fix that. It’s an open-source, serverless API simulator that lets you design endpoints visually or generate them instantly by uploading your API docs (PDF/Markdown) to our AI. My favorite feature is Chaos Mode, you can set a failure rate percentage, and the API will randomly throw 500s or 403s so you can actually test if your frontend toast notifications and retry logic work. It's completely free and open-source. I’d love to hear your feedback, and I'll be hanging around all day to answer questions!

Mock2Block

Instant AI Mock API Generator for Frontend Devs.

Instant AI Mock API Generator for Frontend Devs.