port 3000 is already in use node code example

Example 1: port already in use node js

sudo kill -9 $(sudo lsof -t -i:3000)

Example 2: Port 3000 is already in use, but when I try to kill nothing is found

netstat -ano | findstr :3000
taskkill /PID "123" /F

Example 3: stop npm running on port 3000

netstat -ano | findstr :3000
taskkill /F /PID PID_of_port