Find And Kill Process Running On Specific Port On macOS

March 6, 2024 by Andreas Wik

Port Error

Every now and then when I’m about to start something up, maybe a local dev server, I get this annoying error telling me that the port is already being used by another process.


Error: listen EADDRINUSE: address already in use :::3001


So let’s see how you can find and kill the process occupying a specific port.


Find the process

Find the process by running the following command in the terminal:

lsof -i :<PORT_NUMBER>

You may or may not need to run it with sudo. In that case:

sudo lsof -i :<PORT_NUMBER>

If I run this command on my system right now to see what’s running on port 3001 I’ll go:

lsof -i :3001

This is the output:

node    64575 andreas   26u  IPv6 0xdae1ec221413b353      0t0  TCP *:redwood-broker (LISTEN)


Kill the process

You need the PID in the output above in order to kill it. In this case it’s 64575, so I will run:

kill -9 20384


That should be it. If you now run lsof -i :<PORT_NUMBER> again you should get no output and the port should be free to use.

bada bing bada boom

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