A Practical Project Structure for FastAPI Applications

A short guide to organizing FastAPI apps beyond a single main.py file. FastAPI makes it easy to start with a single main.py file. That is great for demos, prototypes, and small APIs. But once your application grows, one file can quickly turn into a mix of routes, database logic, security helpers, settings, and business rules. A clear project structure helps keep the app easier to understand, test, and extend. Here is a practical FastAPI structure for growing backend applications: . ├── app/ │ ├─