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.
surveyjs.io
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create-guten-block
Discontinued 📦 A zero-configuration #0CJS developer toolkit for building WordPress Gutenberg block plugins.
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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.
Sounds like you're on the right track. You can go with a template, but I'd only recommend that if you're trying to stick to PHP. Instead, checkout create-guten-block as a starting framework for your custom block.
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