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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.
Hmm... I'm not sure why you get a "Loading..." I don't even remember adding a "Loading..." so I'm not sure what that's from. Yes, I do have a account system in place using a database. I am using Node.js and have a mysql backed account system. It requires a bit of setup to get MySQL running on your machine (depending on your operating system), but it's super easy to use on your local system if you have the environment setup. It's a bit more challenging once you take it online; I have a digital ocean droplet that's running this service and a couple more personal projects as well, which does come with a cost to have online. But at least using locally you can build something for free and then when you want you can take it online.