FastAPI is one of the best Python web frameworks available today — fast, async-native, and backed by excellent tooling. But when you move beyond a single main.py file, you quickly realize that FastAPI gives you the engine, not the car. Structuring a production-ready application is entirely up to you.

Let's walk through what that looks like in practice.

Starting from Scratch

1. Project Layout

A typical "real" FastAPI project ends up looking something like this: