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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 don't care what current level he is he could Learn and use a "proper" already sanetized interpreter like https://github.com/NeilFraser/JS-Interpreter and implement it by a command sending the result back it demends a real level in Javascript but if he really wants to do it he could. But if you rly wanna drag down someone on his level for no reason go on I am not judge on here and btw I don't advertise I just provide info and links to people / servers whitch did it or here a way to do it. If you are rly that dumb or think you are the only one able to think properly here I invite you to get outta here ;) and as always have a great rest of your day :) I don't consider the invite as advertising taking that taking as point that it is a community server on the subject of this subreadit.