Based on your Java code I created the javascript implementation. It is located in JS folder and consists of three files:
proquint.js - the implementation itself
proquint.html - demo page using the JS code to convert hex <-> quints
script.js - auxiliary script driving the html gui
The demo page is available online as a github page in my forked repo.
The JS implementation/demo can be used to quickly demonstrate how your algorithm works from a web browser without need to compile code.
Based on your Java code I created the javascript implementation. It is located in JS folder and consists of three files: