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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 full code for this part is in branch part-3, found here
I did want something performant so that I would (hopefully) not run into issues when there are around 100-ish clients connected at the same time. I looked at low-db for a while but did not like that it would JSON.stringify my whole database on every change, which could become a problem when it becomes to big.
So instead I went with lokijs even though I find the documentation of it quite horrible, I have used it before and it works without issues and has lots of features. And I thought it would also be good to show how I use it so others don't have to figure that our on their own 😇