Some error occurred Error: listen EADDRINUSE: address already in use 127.0.0.1:3000 code example

Example 1: Address already in use - bind(2) for "127.0.0.1" port 3000 (Errno::EADDRINUSE)

lsof -wni tcp:3000 
kill -9 PID_number

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

sudo lsof -i :3000

Example 3: 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 4: Error: listen EADDRINUSE: address already in use :::3000

kill -9 {PID}