express-device | Device detection library for node.js | Runtime Evironment library

I'm deploying my nodejs project on a website and the problem is that when we set it up on cpanel a run it shows 404 error when trying to access index route all other routes are ok and without any problem. I'm running it using "npm start" and port is 3005 and when I access it through the website ip and port it seems to be no problem at all but when I access it with website domain it shows 404 error on index route also on localhost everything is working fine

app.js

I have created my startup's website! It took me 5 months. This is my fist Node.js web application. I finished 2 days ago and uploaded my project on Heroku. Happy beginning! But I have a big issue with the error that comes back every 3 or 4 page refreshes, the consol gives me status 503 "name.css or name.js" service unavailable and in my Heroku logs I see H10 error the same "Service unavailable". This happens with different files js, css, sometime images can't load, never the same files. I'am on MacBook pro and uses atom. Can anybody tell me what's going on?

Here is my app.js