FastAPI Development Guide

Build REST APIs with FastAPI - from Hello World to production.

Quick Start

Minimal App

from fastapi import FastAPI
app = FastAPI()

@app.get("/")
def root():
    return {"message": "Hello World"}

Run: fastapi dev main.py → Visit http://127.0.0.1:8000/docs

New Project Setup

Copy starter template from assets/starter-project/ or: