Quick Start in Python
From the FastAPI cheat sheet · Installation & Setup · verified Jul 2026
Quick Start
Install FastAPI with uvicorn and create a basic application.
python
# Install
pip install "fastapi[standard]"
# main.py
from fastapi import FastAPI
app = FastAPI()
@app.get("/")
async def root():
return {"message": "Hello World"}
# Run
fastapi dev main.py💡 "fastapi[standard]" includes uvicorn, email-validator, and other essentials
⚡ Auto-generated docs at /docs (Swagger) and /redoc — no setup needed
📌 Use "fastapi dev" for development (auto-reload) and "fastapi run" for production
🟢 Both sync (def) and async (async def) route handlers are supported
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