FastAPIInteractiveOpen the editor →

61 interactive lessons · free

Learn FastAPI by writing FastAPI.

Not videos. Not snippets to copy. Every lesson is an exercise you complete in a real editor, checked by a real test suite, running a real FastAPI server — inside your browser tab.

Start learning

Don't believe it? Hit Run for real in the editor — it boots an actual Python 3.12 server in this tab and sends the request.

1from fastapi import FastAPI
2 
3app = FastAPI()
4 
5@app.get("/users/{user_id}")
6async def get_user(user_id: int, q: str | None = None):
7    return {"user_id": user_id, "q": q}
Outputexample response
GET/users/42?q=hi200 OK
{"user_id": 42, "q": "hi"}
lessons
61
tracks
3
install steps
0
python
3.12
runs in
your browser

Curriculum

61 lessons across 3 tracks — first route to auth, databases, WebSockets and testing. Start anywhere.

FastAPI Basics

beginner45 lessons · 42 hours
  1. 01First Steps
  2. 02Path Parameters
  3. 03Query Parameters
  4. 04Request Body
  5. 05Query Parameters and String Validations
  6. 06Path Parameters and Numeric Validations
  7. 07Body - Multiple Parameters
  8. 08Body - Fields
  9. 09Body - Nested Models
  10. 10Extra Data Types
  11. 11Cookie Parameters
  12. 12Header Parameters
  13. 13Query Parameter Models
  14. 14Cookie Parameter Models
  15. 15Header Parameter Models
  16. 16Response Model - Return Type
  17. 17Extra Models
  18. 18Response Status Code
  19. 19Request Forms
  20. 20Request Files
  21. 21Request Forms and Files
  22. 22Request Form Models
  23. 23Handling Errors
  24. 24Path Operation Configuration
  25. 25Schema Extra - Examples
  26. 26JSON Compatible Encoder
  27. 27Body - Updates
  28. 28Dependencies - First Steps
  29. 29Classes as Dependencies
  30. 30Dependencies - Sub-dependencies
  31. 31Dependencies - Path Operation Decorators
  32. 32Dependencies - Global Dependencies
  33. 33Dependencies with Yield
  34. 34Security - First Steps
  35. 35Security - Get Current User
  36. 36Security - Simple OAuth2
  37. 37Security - OAuth2 with JWT Tokens
  38. 38Middleware Basics
  39. 39CORS Middleware
  40. 40SQL Databases with SQLModel
  41. 41Bigger Applications - Multiple Files
  42. 42Background Tasks
  43. 43Metadata and Docs URLs
  44. 44Static Files
  45. 45Testing

Build a Blog API with Authentication

intermediate6 lessons · 5 hours
  1. 01Data Models Deep Dive
  2. 02Database Connection
  3. 03User Authentication
  4. 04Authorization Levels
  5. 05File Upload Magic
  6. 06Error Handling Pro

Advanced FastAPI Patterns

advanced10 lessons · 8 hours
  1. 01Async Endpoints & Concurrency
  2. 02Async Dependencies & Lifespan
  3. 03WebSocket Basics
  4. 04WebSocket Rooms & Broadcasting
  5. 05Custom Middleware & Request Processing
  6. 06Rate Limiting with Dependencies
  7. 07Response Caching Patterns
  8. 08Custom Response Types
  9. 09Application Events & Startup Logic
  10. 10API Versioning & Router Composition

Why this beats reading the docs

runtime
A real FastAPI server, not a simulation. Routes, validation errors and status codes behave exactly as they do in production.
grading
Every exercise ships a test suite. Write the code, run it, and get told precisely what is missing.
setup
None. No virtualenv, no Docker, no dependency conflicts — the runtime boots in the tab.
projects
Later tracks use real layouts with routers, models and dependencies across modules.
client
A built-in request client and live Swagger UI exercise the endpoints you just wrote.
solutions
A worked solution and a hint on every exercise, so a hard lesson costs minutes, not the session.

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