What should I do if my application framework is set to run on a port other than 3000 by default? How can I configure it to run on port 3000?

For Next.js, Nuxt.js, and React.js, applications run on Port 3000.
For Angular applications, the start command must be modified in package.json to use Port 3000.

"scripts": {
   "start": "ng serve --port $PORT --host 0.0.0.0 --disable-host-check --open",
 }