localhost:4200 Angular Development Server Port
🅰️ Open localhost:4200 Access your Angular development server with live reload Localhost:4200 is the default port for Angular development server, exclusively used by Angular CLI for serving Angular applications during development. “Localhost” refers to your own computer (typically mapped to IP address 127.0.0.1), and “4200” is Angular’s unique port number. When you see localhost:4200, you’re looking at an Angular application running in development mode.