Question

I’m getting the error 'invalid command name 'main:app'' when running uvicorn main:app --reload. What could be causing this issue, and how can I resolve it?

Answer 1

The error happens because of incorrect module and app name syntax — it should be uvicorn main:app --reload.

Here is the code snippet you can refer to:

In the above code we are using the following key points:

• FastAPI() initializes the web application.
• @app.get("/") sets up a route for the root endpoint.
• read_root() returns a JSON response.
• uvicorn main:app --reload properly references the module (main) and FastAPI instance (app).

Hence, using the correct syntax main:app resolves the "invalid command name" error.