I receive this error when running my application again after it previously crashed or errors. Since I am not opening a new instance of terminal I close out the process with ctr + z
First, you would want to know which process is using port 3000
sudo lsof -i :3000
this will list all PID listening on this port, once you have the PID you can terminate it with the following:
kill -9 <PID>
where you replace <PID> by the process ID, or the list of process IDs, the previous command output.
2. method 2
You can also go the command line route:
ps aux | grep node
to get the process ids.
Then:
kill -9 PID
Doing the -9 on kill sends a SIGKILL (instead of a SIGTERM). SIGTERM has been ignored by node for me sometimes.