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Learn to build web APIs with FastAPI, the modern Python framework. Define endpoints with path and query parameters, validate data with Pydantic, design clean responses and errors, store data with SQLModel, organise bigger apps, add logins with tokens, and write tests. Every example is real FastAPI code that runs in your browser, with requests you can send and change. Diagrams, a quick knowledge check every day, and a complete API to finish. Some Python is assumed (our Python course covers it).

  • 12 days
  • ~30 min / day
  • Intermediate
  • Day 1 free, then a free account
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Start Day 1

The big picture

Everything you'll cover, and how it fits together.

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Day by day

Go at your own pace. Your progress is remembered on this device.

  1. 1
    Day 1Up nextFree, no sign-up 30 min

    APIs & Your First Endpoint

    What an API is, HTTP in a nutshell, and a FastAPI app you can call.

    HTTPJSONTestClient
  2. 2
    Day 2 30 min

    Path & Query Parameters

    Read values from the URL, with types and validation for free.

    PathQueryValidation
  3. 3
    Day 3 30 min

    Request Bodies with Pydantic

    Accept JSON data, validate it with models, and read 422 errors.

    BaseModelField422
  4. 4
    Day 4 30 min

    Responses & Errors

    Response models, status codes, hiding fields and raising errors.

    response_modelStatus codesHTTPException
  5. 5
    Day 5 30 min

    A CRUD API

    Create, read, update and delete: a complete REST resource.

    RESTPUT & PATCHDELETE
  6. 6
    Day 6 30 min

    Dependencies

    Share logic between endpoints with Depends.

    DependsAnnotatedyield
  7. 7
    Day 7 30 min

    Databases with SQLModel

    Store data in SQL with models that are also tables.

    SQLModelSessionsQueries
  8. 8
    Day 8 30 min

    Structuring a Bigger App

    Routers, settings, lifespan events and a project layout that scales.

    APIRouterSettingsLifespan
  9. 9
    Day 9 30 min

    Authentication

    API keys, password hashing, logins and JWT access tokens.

    HashingOAuth2JWT
  10. 10
    Day 10 30 min

    Testing Your API

    Automated tests with TestClient, a test database and overrides.

    pytestTestClientOverrides
  11. 11
    Day 11 30 min

    Middleware, CORS & Async

    Middleware, CORS, background tasks, and when to use async def.

    MiddlewareCORSasync
  12. 12
    Day 12 30 min

    Project: A Bookshop API

    Build a complete, tested API, then run and deploy it for real.

    DesignBuildingDeploying