I've finished the URL Shorter challenge and I will like to get some feedback

Hi, after completing the front end projects and a couple of time without login to freecodecamp site I decided that I will get into the backend challenges so here I am I’ve completed three challenges in four days not bad for me, but I think this is the most beautiful project that I’ve done so I decided to share with the community of freecodecamp.

This is app url: https://intense-beyond-33447.herokuapp.com/
This is the source code: https://github.com/0c0de/heroku-url-shorter/

Thanks for all :wink: