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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.
The script creates a web component named in the dom. The project uses Svelte + Rollup but I missed routing from SvelteKit. Therefore, I build my own tiny router in the form of a svelte store https://github.com/samuelstroschein/bromb/blob/main/packages/web/src/router.ts . The latter was required because web components encapsulate styles, but apparently not javascript. Using other routing libraries led to bugs caused by mingling around with the hosts routing.