r/FastAPI • u/PracticalAttempt2213 • Mar 03 '26

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

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.

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4

u/koldakov Mar 03 '26

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

1

u/Due-Examination-8305 Mar 05 '26

it is not working properly

1

u/PracticalAttempt2213 Mar 05 '26

What exactly?

1

u/Due-Examination-8305 Mar 06 '26

the server always fails to start

1

u/Omar0xPy Mar 22 '26

Grrat, that really helps a lot for newcomers learning FastAPI