What is pydantic?
Who uses pydantic?
Here are some stack decisions, common use cases and reviews by companies and developers who chose pydantic in their tech stack.
If you are building an API with Python there are lots of good reasons to pick FastAPI. It is a modern framework with very good documentation and a great community built around it. It supports async Python and it builds on Starlette and pydantic to provide ergonomics and speed. One of the bigger wins is the integrated documentation browser alongside the great testing support.
One part that was not as easy to get into was the proper use of the dependency mechanism, but once that was solved FastAPI remains a great choice.