Deploying github repo to railway. app resulting - Application Error Is your app correctly listening on PORT?

Question

There was a solution available on github of adding the variable i did that, what ever i put port number it says already in use, follow is the error on deploy log..

   listening on port 9586
   Port 9586 is already in use
  [nodemon] app crashed - waiting for file changes before starting...

Following is the error when i open the deployed link Application Error

 Is your app correctly listening on $PORT?

View the deployment below to check for errors

this is the link of deployed repo https://rehub-backend.up.railway.app/ , Please do assist if u have any idea

Answer 1

In place of app.listen(PORT); use app.listen(process.env.PORT);