If you are still using Flask or Django REST Framework to develop REST APIs but have yet to discover FastAPI, you are missing out on some real performance and developer experience. For all the right reasons, FastAPI is one of the most starred Python projects on GitHub—and for a reason, it's more than just that. Let's get very deep into how it works and let's make something real on the way. ** What Is FastAPI?** FastAPI is a new, high-performance Python-based web framework designed to create APIs. It is built on top of Starlette (for web parts) and Pydantic (for data validation) and natively supports Python's async/await syntax. Key selling points: Benchmarks: On par with NodeJS and Go Swagger UI and ReDoc: Automatic docs out of the box. Type safety: Type annotations for validation and editor assistance in Python: Async-first: First-class support for async request handlers.…