FastAPI Has a Free API — The Fastest Python Web Framework

FastAPI is the fastest-growing Python web framework — 78K+ GitHub stars, async by default, automatic OpenAPI docs, and type-safe validation. All free and open source. Why FastAPI? Fastest Python framework — on par with Node.js and Go Automatic API docs — Swagger UI and ReDoc generated from code Type validation — Pydantic v2 validates all inputs automatically Async native — built on ASGI, supports async/await Dependency injection �� clean, testable code Production-ready — used by Microsoft, Netflix, Uber Quick Start pip install fastapi uvicorn from fastapi import FastAPI app = FastAPI () @app.get ( " / " ) async def root (): return { " message " : " Hello, FastAPI! " } @app.get ( " /users/{user_id} " ) async def get_user ( user_id : int ): return { " user_id " : user_id , " name " : " Alice " } # Run with: uvicorn main:app --reload # Docs at: http://localhost:8000/docs Pydantic Models (Auto-Validation) from pydantic import BaseModel , EmailStr , Field from datetime import datetime class