port 3000 is already in use code example

Example 1: address already in use :::3000

lsof -i:3000 
kill -9 [PID]

Example 2: port 8080 already in use

netstat -ano | findstr 8080

Example 3: npm port already in use

$ lsof -i tcp:3000
$ kill -9 PID

Example 4: Port 3000 is already in use, but when I try to kill nothing is found

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

Example 5: stop npm running on port 3000

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

Example 6: port 4200 is already in use.

taskkill -f /pid 18932