: A "localhost" link only works if a specific program is actively "listening" on that port on your machine. If the software is not running, your browser will show a "Refused to Connect" error. Format the URL : The link should typically be entered in your browser as
Clicking that link opens the local web application. localhost11501 link
$env:PORT=4000 # Windows PowerShell export PORT=4000 # Mac/Linux npm start : A "localhost" link only works if a
: It may serve as an endpoint for a backend API that a frontend application (running on a different port like 3000) needs to access. Common Error: "Localhost Refused to Connect" localhost11501 link