FastAPI Fundamentals
FastAPI is a Python framework for building HTTP APIs. You describe routes and data with Python type hints, and FastAPI validates requests and produces an OpenAPI description for the API.
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Intro
FastAPI Fundamentals
FastAPI is a Python framework for building HTTP APIs. You declare the paths your application serves and write a Python function for each operation. Type annotations describe input and output data. FastAPI uses those declarations to parse requests, validate data, and generate an OpenAPI description.
The useful mental model is a contract at the HTTP boundary. A client sends a method, path, headers, query values, and sometimes a body. A path operation selects a function. FastAPI obtains declared inputs, runs dependencies, validates data, and serializes the response. Your function still owns the application decision.
What FastAPI gives you
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Sources
- https://fastapi.tiangolo.com/
Supports
- FastAPI as a Python web framework for APIs based on standard Python type hints
- Starlette for web components, Pydantic for data components, and OpenAPI and JSON Schema compatibility
- https://fastapi.tiangolo.com/tutorial/first-steps/
Supports
- FastAPI application creation, path operation decorators, development process, automatic documentation, and generated OpenAPI schema
- Paths, operations, and handler functions
- https://fastapi.tiangolo.com/tutorial/path-params/
Supports
- Named path parameters and typed parsing and validation
- https://fastapi.tiangolo.com/tutorial/body/
Supports
- Pydantic models as typed request bodies and input validation
- https://fastapi.tiangolo.com/tutorial/response-model/
Supports
- Response model validation, filtering, and OpenAPI documentation
- https://fastapi.tiangolo.com/tutorial/dependencies/
Supports
- Dependency declaration, resolution, reuse, and nested dependencies
- https://fastapi.tiangolo.com/tutorial/security/
Supports
- FastAPI security utilities and OAuth2 security patterns
- https://fastapi.tiangolo.com/async/
Supports
- Choosing async and normal path operation functions from the behavior of called libraries
- Blocking behavior and thread pool handling for normal functions
- https://fastapi.tiangolo.com/deployment/concepts/
Supports
- Deployment concepts including processes, startup, restarts, replication, memory, HTTPS, and tooling
- https://github.com/mjhea0/awesome-fastapi
Supports
- Curated FastAPI ecosystem entries including SQLModel, FastAPI Users, the full-stack template, FastAPI CLI, and OpenTelemetry instrumentation