Can I use multiple FastAPI instances?

Usually, you only create one main `FastAPI()` instance. If your app gets very large, you don't create multiple apps; instead, you use `APIRouter` to split your routes across multiple files and include them in the main app.

Why do we use `--reload` with Uvicorn?

The `--reload` flag tells Uvicorn to watch your Python files for changes and automatically restart the server when you save. It is essential for a fast development loop, but you MUST remove it in production to maximize performance.

Is Swagger UI only for reading?

No! The Swagger UI at `/docs` is fully interactive. You can click the 'Try it out' button on any endpoint, enter data into the auto-generated forms, and fire real HTTP requests to your server directly from the browser.

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Tutorials

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FastAPI Core

Master the fundamental architecture of a FastAPI application. Learn how to initialize the core instance, map HTTP methods via decorators, utilize Uvicorn as an ASGI server, and explore the auto-generated documentation.

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