FastAPI

What is FastAPI?

A modern, fast (high-performance) web framework for building APIs with Python, based on standard Python type hints. Built on Starlette and Pydantic, offering performance comparable to Node.js and Go. Features automatic interactive API documentation (Swagger UI and ReDoc), automatic data validation, serialization, and dependency injection. One of the fastest Python frameworks available. Used by companies like Microsoft, Uber, and Netflix. Known for its developer experience and automatic OpenAPI schema generation.

When to use it

• Perfect for building high-performance REST APIs, microservices, and web applications with Python.
• Ideal when you need automatic API documentation, data validation, and type safety.
• Excellent for modern Python applications that require fast response times and async support.
• Commonly used for building backend APIs, data science APIs, and when you want the performance of async Python.

When NOT to use it

• When you need a full-stack framework - Django provides more built-in features
• Simple APIs with minimal requirements - Flask might be lighter
• When team prefers synchronous Python - async/await adds complexity
• Applications requiring extensive admin interfaces - Django has better admin support

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