error [ Error: listen EADDRINUSE: address already in use 127.0.0.1:4000 ] code example

Example 1: EADDRINUSE: address already in use

sudo lsof -i :<PORT>
kill -9 <PID>

Example 2: Error: listen EADDRINUSE: address already in use :::8080

ps aux | grep node //gets all the nodes and list of PID
kill -9 {PID}