FastAPI@FastAPI
Oct 21
Optional parameter models in FastAPI 0.159.0 ✨

No dates? No filter.

Send either date? Both are required.

Make the whole Pydantic model optional while keeping its fields required.

Works with query parameters, headers, and cookies. 🚀

fastapi.tiangolo.com/tutorial/query…

Oct 21, 2026 · 8:04 PM UTC

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RepliesRelevant
Husniddin@uzbboy
Oct 22
Replying to @FastAPI
@FastAPI @tiangolo Interesting!
No more boilerplate code to validate inputs manually
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niels .1
@TSC
Oct 21
Replying to @FastAPI
@FastAPI finally my hand-rolled date range check retires. eleven versions in one day tho, my lockfile 💀
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Sujal
@hecodesforme
Oct 22
Replying to @FastAPI
@FastAPI I'd use that for every date range filter, both dates or none
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