Please note that GroupDocs.Editor for Java is a back-end, UI-agnostic API that could be integrated in any Java application without any third party tool or software dependency.
We’d recommend you to explore this open-source Spring application. Have a look at this video demo as well.
How API works?
It converts the source file (DOCX in your case) to HTML and then pass the output to a WYSIWYG-editor (e.g. CKEditor or TinyMCE). You have to develop the front end as per your business need. However, we already shared a sample UI application with you above.
Basically, license works with the back-end API. It doesn’t have to do anything with the UI. You can use an JS framework at front end.
As per free support policy, all free support queries are assisted here on this forum. However, please feel free to raise your concerns.