JS is one of the core technologies of web development and can be used on both the front-end and the back-end. JS is among the most powerful and flexible programming languages of the web.
Of course, you can go directly to Upfile website through this link http://pazguille.github.io/upfile.
This is the description from the web "Makes file inputs a pleasure to use with progressive enhancement.".
It belongs to pazguille https://github.com/pazguille.
You can also go to his page on GitHub through the following link https://github.com/pazguille/upfile.