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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.
lowdb MIGHT be a good choice. It stores everything in a JSON file and uses Lodash for querying. I have used on a couple of personal projects but it isn't very well maintained (over 100 issues). Personally I really like it! I would never use it in anything serious though lol
nedb is the package you are searching for. Just JS, same syntax as MongoDB, runs in RAM and can persist data on disk
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Hence, a higher number means a more popular project.