FastAPI Has a Free Python Web Framework — Build APIs with Automatic Docs and Validation

A Python developer built a REST API with Flask. Manual request validation. Manual OpenAPI docs. Manual type conversion. Every endpoint was 30% boilerplate. FastAPI auto-generates OpenAPI docs, validates requests, and converts types - all from Python type hints you already write. What FastAPI Offers for Free Automatic OpenAPI - Interactive Swagger docs at /docs Type Validation - Pydantic models validate requests automatically Async - Native async/await support Fast - On par with Node.js and Go performance Dependency Injection - Clean DI system WebSocket - Built-in WebSocket support OAuth2 - Security utilities included Testing - TestClient for unit tests Quick Start from fastapi import FastAPI from pydantic import BaseModel app = FastAPI () class Item ( BaseModel ): name : str price : float @app.post ( " /items/ " ) async def create_item ( item : Item ): return { " name " : item . name , " price_with_tax " : item . price * 1.1 } # Run: uvicorn main:app --reload # Docs: http://localhost:8