Tutorial — User Guide¶
This tutorial walks you through FasterAPI step by step. Each section builds on the previous one, so follow them in order if you are new to the framework.
By the end you will know how to:
- declare path, query, header, cookie, and body parameters
- validate and serialize data with msgspec
- compose dependencies with
Depends() - run background tasks
- handle errors gracefully
- document your API automatically via OpenAPI / Swagger UI
Prerequisites¶
- Python 3.10 or later (3.13 recommended)
- Basic familiarity with
async/await - FasterAPI installed (
pip install faster-api-web)
Pages¶
| Topic | What you learn |
|---|---|
| Path Parameters | Dynamic path segments, type coercion |
| Query Parameters | Optional/required query strings, aliases |
| Request Body | Typed JSON bodies with msgspec.Struct |
| Response Model | Return types, status codes, response filtering |
| Form Data & File Uploads | Form(), File(), UploadFile |
| Error Handling | HTTPException, custom exception handlers |
| Dependencies | Depends(), scoped DI, chained deps |
| Background Tasks | Fire-and-forget after the response |
| Middleware | CORS, GZip, custom middleware |
| WebSockets | Real-time bidirectional connections |
| Metadata & Docs | Tags, summaries, OpenAPI customisation |
Already a FastAPI user? See Migrating from FastAPI for a focused diff rather than a full walkthrough.