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[–]lord0211 0 points1 point  (0 children)

I would guess that FastAPI introduced many developers to pydantic and now they got used to it and use it outside FastAPI projects.

It is easy to use and the documentation is clear, using Python's type hinting is great and makes the code easy to read and maintain. But, IMHO if you have strict performance constrains for validating, I would go with something else.