Web Reference: Dive deep into data validation in FastAPI using Pydantic! In this video, we'll explore how to enforce data integrity by validating user inputs with Pydantic's powerful features. Mar 31, 2026 · FastAPI is a modern, high performance Python web framework for building APIs quickly and efficiently. It offers automatic data validation, type checking, async support and built-in interactive API docs using Swagger UI and ReDoc. FastAPI allows you to declare additional information and validation for your parameters. Let's take this application as example: The query parameter q is of type str | None, that means that it's of type str but could also be None, and indeed, the default value is None, so FastAPI will know it's not required.
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Last Updated: April 7, 2026
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