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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
If you're not getting an OSD your FC could be shot. If you're getting an OSD but there is no indication any of the control packets from the radio are making it through the issue is likely with either your transmitter or the receiver on the TH2 (having another remote/drone using the FrSky D8 protocol would be helpful to troubleshoot). If everything seems to be working but you just can't get the quad to arm, then there should be a message in the OSD to explain why, but if not see if you can connect the flight controller to the betaflight configurator to assist in troubleshooting.