How to start Angular 2 Application on a Custom port other than 4200 You can start the angular project using the angular cli using command ng serve The above command will start the project on port 4200 . If you want to start the application on a prot different that 4200 then you can start the project using the following command. ng serve --port <port-number> where <port-number> can be any valid port that is not in use.