Uvicorn/FastAPI Duplicate Logging

Question

My FastAPI app seems to log many things twice.

INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [21360] using statreload
INFO:     Started server process [21362]
INFO:uvicorn.error:Started server process [21362]
INFO:     Waiting for application startup.
INFO:uvicorn.error:Waiting for application startup.
INFO:     Application startup complete.
INFO:uvicorn.error:Application startup complete.
^CINFO:     Shutting down
INFO:uvicorn.error:Shutting down
INFO:     Waiting for application shutdown.
INFO:uvicorn.error:Waiting for application shutdown.
INFO:     Application shutdown complete.
INFO:uvicorn.error:Application shutdown complete.
INFO:     Finished server process [21362]
INFO:uvicorn.error:Finished server process [21362]
INFO:     Stopping reloader process [21360]

This includes any exceptions that are raised, you get the entire stack trace twice. I've seen some answers suggest just removing the log handlers for Uvicorn, but this feels wrong. What if there is a logging event that happens at the Uvicorn layer of the stack but not in FastAPI?

Is there a way to get only log output once without just overwriting uvicorn's log handlers?

Answer 1

Just remove the uvicorn handlers:

logging.getLogger("uvicorn").handlers.clear()