How to terminate previously occupied port in macOs terminal-CodePudding

I am learning node js in macOs but I am constantly getting error like

listen EADDRINUSE: address already in use 127.0.0.1:2300<

CodePudding user response：

You need to find the process that's using the port then kill it. To find the process use the following command:

lsof -i -P

The -i flag displays only IP connections and the -P flag prints the port as numbers (instead of name, eg 443 instead of https).

You can filter the result using grep:

lsof -i -P | grep 2300

The first column is the program/command name and the second column is the process id. For example, if you get the following result:

myProgram   12345  ajit  5u IPv4 0xbb6307766636b4b9 0t0 TCP *:2300 (LISTEN)

You can kill the process:

kill 12345

CodePudding user response：

First you must to know the PID of what you're looking to kill:

sudo lsof -i :2300

And then kill it with this command:

kill -9 <PID>

PLEASE NOTE: -9 kills the process immediately, and gives it no chance of cleaning up after itself.