How to find a port in use by a process with lsof

lsof -i tcp:3000

An alternative option is to use netstat

netstat -vanp tcp | grep 3000

Quickly kill the port with

kill -i $(lsof -ti:3000)

For multiple ports you can use

kill -9 $(lsof -ti:3000,3001)

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References:

• https://stackoverflow.com/questions/3855127/find-and-kill-process-locking-port-3000-on-mac