Lesson 02 · 10 min
Path and query parameters
Types in arguments are both validation and conversion.
10 minLesson 2 of 9Practice includedAsk AI on any point
A function argument named like {item_id} in the path is a path parameter. Other simple arguments are query parameters. An int annotation makes FastAPI convert the string to a number, or return 422 with an explanation if it can't.
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