Hi @Barabba11
if you have followed the Raspberry Pi install docs here: https://nodered.org/docs/hardware/raspberrypi then, as described on that page, then you should also have the node-red-log
command.
But if you haven't used our install script, you won't have that command. In which case, you should be able to use
sudo journalctl -f -u nodered -o cat
to get the logs from the service.