You should read the user documentation first, make sure you understand the difference between a group and a tag. UserTags modules are straightforward to create, modules are objects that implement the following interface: UserTagsJS.extensions.MyModule = { start: function(config, username, logger, lang) { // Start up code // Return Values: // [Array of group strings] // A jQuery promise // An object literal: { tags: {}, groups: [], promise: $.Deferred().promise(), ajax: [{}] } // undefined/null/false/0/ }, generate: function(json1, json2, json3, ...) { // AJAX completion callback // Return Values: // [Groups Array] // Object literal: { tags: {}, groups: [] } // undefined/null/false/0/ },f generateFailed: function() { // AJAX failure callback // Return values are the same as generate() }, d