Error: listen EADDRINUSE: address already in use :::9100 at Server.setupListenHandle [as _listen2] code example

Example 1: Error: listen EADDRINUSE: address already in use :::9000

step-1 Enter commond to see running ports & processes
ps -ef
step-2 To stop port and processes
sudo kill {PID}

Example 2: Error: listen EADDRINUSE: address already in use :::3000

ps aux | grep node
kill -9 PID