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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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.
I've only had a brief look through Siderbery's code before https://github.com/mbnuqw/sidebery. I'm not really sure where to start with Vivaldi extensions but I have been tempted to look into it. It's chromium, so chrome extensions will work, although Sidebery is sort of a kitchen sink conversion for Firefox and I'm not sure if something similar exists on Chrome.
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