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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 something it's not working on localhost and you can't figure out why, try to use the ngrok tool. It will create a tunnel to your localhost and you can use it to test your plugin. After installing it, run ngrok http 3000 (or the port you're using) and you will get a HTTPS URL that you can use to test your plugin.
A couple of weeks ago, I discovered Autocode, a suite of tools that allows you to develop and launch many software projects with one of the best Developer Experience (DX) I've ever seen. I was so impressed by the DX that I decided to create a plugin for ChatGPT using Autocode.