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:8000/docs (auto-generated!)

GitHub: fastapi/fastapi - 79K+ stars

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