How do you apply a common path prefix across FastAPI routers?
Tests whether you know APIRouter decouples routes from path prefixes. Use relative paths in APIRouter, then mount with app.include_router(router, prefix="/api/v1"). This keeps modules reusable. Red flag: hardcoding the full absolute path in every decorator.
Tests whether you understand APIRouter's role in separating route logic from URL structure. A strong answer explains that each router should define relative paths like /users and /items, while the main FastAPI application mounts them with app.include_router(router, prefix="/api/v1"). This approach keeps router modules independent, reusable, and free of hardcoded global prefixes. Mentioning that the same router can be mounted multiple times with different prefixes shows deeper familiarity.
Read the original → fastapi.tiangolo.com
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