Kill Port Process
Often when running a process on a port, we get the message that the port is already in use by some other process. To kill the process, we can use the following commands:
Linux and Mac:
sudo kill $(sudo lsof -t -i:4200)
sudo kill `sudo lsof -t -i:4200`
sudo lsof -t -i tcp:4200 | xargs kill -9
Windows:
netstat -a -n -o | findStr "4200"
taskkill -f /pid 11128
Source: "Port 4200 is already in use" when running the ng serve command