FastAPI: Splitting Your App with `include_router`
`app.include_router` is like plugging a pre-wired power strip of API endpoints into your main FastAPI app. It lets you organize a large app into smaller files by feature, then combine them. The footgun is forgetting to add a URL `prefix` for each router.
`app.include_router` is FastAPI's tool for managing large applications. Think of it like a power strip (`APIRouter`) for your API endpoints. You group related routes in separate files, then plug that whole strip into your main app. This keeps your project organized by feature (e.g., users, products). The common mistake is forgetting to set a `prefix` like `/users`, causing path collisions at the root level.
Read the original → fastapi.tiangolo.com
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