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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.
This is really similar to Quokka, which is a fantastic tool and worth every penny.
If you can build something portable, charge money for it IMO. I currently pay $50/year for this:
https://quokkajs.com/
Haha, both of those cases are killing both the iframe and the UI. I have to get around to using totally different domain on the iframe to really take advantage of the Chrome process isolation. Previously I was using a really nice JS interpreter written in JS[0] before to solve that problem, but it ran 200 times slower than the browser interpreter(!)
[0] https://github.com/NeilFraser/JS-Interpreter