FastAPI

How FastAPI's ASGI foundation, Depends dependency graph, and Pydantic validation compose into a single request lifecycle, and why that composition - not any one feature alone - is the framework's real design.

Learn FastAPI basics with 10 examples, covering app setup, path and query parameters, and automatic OpenAPI documentation.

Learn how FastAPI uses Pydantic 2 models to validate incoming request data and shape outgoing responses, ensuring data integrity and consistency.

Learn how FastAPI's Dependency Injection composes per-request providers for settings, databases, and authentication, including sub-dependencies and overrides.

Combine FastAPI async def routes with SQLAlchemy 2.0 async sessions and asyncpg for high-concurrency I/O APIs and PostgreSQL.

Implement CORS, add request IDs, and manage exceptions uniformly in FastAPI. Learn to use middleware and exception handlers for robust API error handling.

Test FastAPI routes with TestClient, dependency overrides, and async clients. Learn to test authentication, databases, and OpenAPI contracts.

Learn FastAPI best practices for building maintainable, secure, and fast services. Structure routers, validate data, optimize performance, and secure your API.

A single-page roundup of every highlight bullet from the 12 pages in the FastAPI section, grouped by source page so you can scan all 69 takeaways without opening each article individually.