occurred: Port 4200 is already in use. with port to use code example

Example 1: cancel ng server port

Using your terminal, find the PID of port 4200
netstat -ano | findstr :4200

Kill task by the PID Number (Replace 15940)
taskkill /PID 15940 /F

Example 2: port 4200 is already in use.

netstat -a -n -o