https://datatweets.com/courses/fastapi/dependencies-and-structure/Recent content in Structure, Dependencies, and Middleware on DATATWEETSHugoenCopyright (c) 2025 DatatweetsSun, 28 Jun 2026 09:00:00 +0200https://datatweets.com/courses/fastapi/dependencies-and-structure/lesson-1-dependency-injection/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/fastapi/dependencies-and-structure/lesson-1-dependency-injection/Dependency injection is FastAPI’s way to reuse logic — pagination, auth, a database session — across endpoints. Write a dependency function, declare it with Depends, and let FastAPI run it and pass the result into your endpoint.https://datatweets.com/courses/fastapi/dependencies-and-structure/lesson-2-reusable-and-sub-dependencies/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/fastapi/dependencies-and-structure/lesson-2-reusable-and-sub-dependencies/Three powerful dependency patterns: class dependencies that give you a typed object, sub-dependencies that chain together (like current-user on top of an api-key check), and yield dependencies that set up and tear down resources such as a database session.https://datatweets.com/courses/fastapi/dependencies-and-structure/lesson-3-bigger-applications-with-routers/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/fastapi/dependencies-and-structure/lesson-3-bigger-applications-with-routers/One giant main.py doesn’t scale. Use APIRouter to move related routes into their own modules, give each a prefix and tags, and assemble them with include_router — the standard way to structure a real FastAPI project.https://datatweets.com/courses/fastapi/dependencies-and-structure/lesson-4-middleware-and-cors/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/fastapi/dependencies-and-structure/lesson-4-middleware-and-cors/Middleware wraps every request and response, perfect for cross-cutting concerns like timing, logging, and custom headers. Learn to write your own, then enable CORS so browser frontends on other origins can call your API safely.https://datatweets.com/courses/fastapi/dependencies-and-structure/lesson-5-guided-project-modular-app/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/fastapi/dependencies-and-structure/lesson-5-guided-project-modular-app/The fourth version of the course project: restructure the Tasks API the professional way. Split routes into an APIRouter, share logic with a dependency, add middleware and CORS, and assemble it all in a tidy project layout.