FastAPI

A modern Python framework built on Starlette and Pydantic, combining high performance with excellent developer experience.

Minimal Example

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()

class Item(BaseModel):
    name: str
    price: float

@app.post("/items")
def create_item(item: Item):
    return {"ok": True, "item": item}

Highlights

• Automatic docs via Swagger and ReDoc.
• Strict data validation with Pydantic.
• First-class async/await support.
• Performance close to Node.js and Go.

Running in Production

Use Uvicorn behind Gunicorn or Granian, all packed in Docker.

uvicorn app.main:app --host 0.0.0.0 --port 8000 --workers 4

Tips

• Keep business logic in services.
• Use the built-in dependency injection.
• Add rate limiting and CORS carefully.

FastAPI reduces development time without sacrificing performance.