structured-filter (currently v1.0.8) is a Web UI for building structured search queries. It is a full jQuery UI widget, supporting various configurations and themes.
API Tests: Add Condition - Remove First Condition - Number of Conditions - Clear
Themes: ui-lightness - ui-darkness - redmond - start - le-frog
Value Formats: JSON - Text - URL
The documentation and source code are available at GitHub
under MIT license.
There is a fork of the code using Bootstrap and Backbone.js as part of Evolutility.