FastAPI Component for Diploi

Operation

Getting started

1. In the Dashboard, click Create Project +
2. Under Pick Components, choose FastAPI. Here you can also add a frontend framework to create a monorepo app, eg, FastAPI for backend and React+Vite for frontend
3. In Pick Add-ons, you can add one or multiple databases to your app
4. Choose Create Repository to generate a new GitHub repo
5. Finally, click Launch Stack

Link to the full guide https://diploi.com/blog/hosting_fastapi_apps

Development

During development, the container installs Node.js and nodemon to enable automatic reloads when files change. The development server is started with:

nodemon --delay 1 --watch pyproject.toml --watch ".venv/lib/*" --watch ".venv/lib64/*" --exec "uv run --isolated uvicorn src.main:app --host 0.0.0.0 --port 8000 --reload --reload-dir src --reload-exclude \".venv/**\""

This will:

• Use nodemon to watch for changes to pyproject.toml and restart the server when changes are detected.
• Run the command uv run —isolated uvicorn src.main:app —host 0.0.0.0 —port 8000 —reload in an isolated Python environment.
• Start the FastAPI app using uvicorn on all network interfaces at port 8000.
• Enable hot-reload via uvicorn —reload, so the server automatically restarts when Python source files change.

Production

Builds a production-ready image. During the build, dependencies are installed with uv sync. When the container starts, it runs:

fastapi run src/main.py --proxy-headers --port 8000

This uses the FastAPI CLI to serve your application on port 8000.

Links

• FastAPI documentation
• Python documentation
• uv documentation