title: localhost:3000 is not working in the browser
body: <p>Backend: Express server, with npx create-express-api backend</p>
  <p>Frontend: Next.js, with npx create-react-app frontend</p>
  <p>I have implemented these command in my root folder and trying to run npm start xxx to check if they are still working or not. But they are not working in my http://localhost:3000
  Though they are working in this link <a href="http://172.27.178.192:3000" rel="nofollow noreferrer">http://172.27.178.192:3000</a> (on my network)
  <a href="https://i.stack.imgur.com/axdOo.png" rel="nofollow noreferrer">This is the image showing the problem</a></p>
  <p>I have changed browsers and still the same problem is appearing. On the browser it says
  Unable to connect
  Firefox can’t establish a connection to the server at localhost:3000.</p>