What Is FastAPI?

How FastAPI Works

FastAPI uses Python type hints to automatically validate requests, serialize responses, and generate interactive API docs (Swagger UI). A typed endpoint like def get_user(user_id: int) -> User automatically validates the input and documents the output.

Key Concepts

• Pydantic Models — Define data schemas with Python type hints — automatic validation, serialization, and documentation
• Async Support — Native async/await for high-performance I/O — handles thousands of concurrent connections
• Auto-Generated Docs — Swagger UI and ReDoc documentation generated automatically from your type annotations

Learn FastAPI — Top Videos

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I built the same app 3 times | Which Python Framework is best? Django vs Flask vs FastAPI Patrick Loeber

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Python FastAPI Tutorial: Build a REST API in 15 Minutes pixegami

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Python FastAPI Tutorial (Part 1): Getting Started - Web App + REST API Corey Schafer

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Frequently Asked Questions