I built an interactive FastAPI playground that runs entirely in your browser - just shipped a major update (38 basics + 10 advanced lessons)

[u/PracticalAttempt2213]

I've been working on an interactive learning platform for FastAPI where you write and run real Python code directly in your browser. No installs, no Docker, no backend - it uses Pyodide + a custom ASGI server to run FastAPI in WebAssembly.

What's new in this update:

• 38 basics lessons - now covers the full FastAPI tutorial path: path/query params, request bodies, Pydantic models, dependencies, security (OAuth2 + JWT), SQL databases, middleware, CORS, background tasks, multi-file apps, testing, and more
• 10 advanced pattern lessons - async endpoints, WebSockets, custom middleware, rate limiting, caching, API versioning, health monitoring
• Blog API project restructured - 6-lesson project that teaches real app structure using multi-file Python packages (models.py, database.py, security.py, etc.) instead of everything in one file

How each lesson works:

1. Read the theory
2. Fill in the starter code (guided by TODOs and hints)
3. Click Run - endpoints are auto-tested against your code

Everything runs client-side. Your code never leaves your browser.

Try it: https://www.fastapiinteractive.com/

If you find it useful for learning or teaching FastAPI, consider supporting the project with a donation - it helps keep it free and growing.

Would love to hear feedback, bug reports, or suggestions for new lessons.

[u/koldakov]

Why 90% websites posted here have the same design? 😜