Error : uncaughtException: listen EADDRINUSE in nodejs

This type of error arises when the port number which listen() tries to bind the server to is already in use.

So before start nodejs app again, you must have to stop previous running nodejs app  or kill running nodejs process.

You can check current running all nodejs process by the following command

ps aux| grep node

Out put
root     14584  0.0  0.6   938816  22580 ?        Ssl  01:23   0:02  node      app.js(your app path and runnig file)

Stop current running app by the following command

kill <processId>

EX :
kill 14584

Now start nodejs app again and your app will run successfully.