FastAPI

ELI5 — The Vibe Check

FastAPI is a Python framework that's both blazing fast and auto-generates documentation for your API. You define types with Python type hints, and FastAPI validates requests, builds your docs, and handles serialization automatically. It's what AI engineers reach for when they need a Python API.

Real Talk

FastAPI is a modern, high-performance Python web framework for building APIs, based on standard Python type hints. It uses Starlette for HTTP and Pydantic for data validation, auto-generates OpenAPI (Swagger) docs, and supports async/await natively. Among the fastest Python frameworks.

Show Me The Code

from fastapi import FastAPI
app = FastAPI()

@app.get('/users/{user_id}')
async def get_user(user_id: int):
    return {'id': user_id, 'name': 'Alice'}

When You'll Hear This

"FastAPI is the go-to for Python AI backends." / "FastAPI auto-generates Swagger docs from your type hints."