You can use Ajax to request their user page, and in the json it should specify all of the groups they're in.
ah sorry forgot to reply here,
meantime I found out, that its not a problem in custom JS to use app.user.groupTitle 🙂
it works fine so good
The above post references groups settings when creating a new category but I'm not seeing any group type settings in the category create menu.
Can someone help me with this. I'd like to create categories for specific groups.
I believe this was moved to the centralized permissions page. Select your category from the drop-down and configure which groups can access it.