Manual writing and editing form-based UIs is time consuming and error prone effort. JSON Forms allows you to describe the layout and controls of your forms with ui schema. On the other hand, specifying these user interface descriptions natively as JSON is not optimal. In order to reduce effort and avoid possible errors, my aim is to implement a web-based tool for creating ui schema. This tool can be deployed stand-alone and shall be integrated into Theia as a web-based IDE platform.