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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.
It is fair to say that I have a sketch of a plan to start from - my play lists are sorted by date. In rekordbox I sort each playlist via the camelot wheel, in counter-clockwise. So F#m / A around to Dbm / E . I also made a camelot wheel page, so that you could click on a key and see what may work - I have to get that back up and running. Anyway, that sorting does not always mean that the tracks will flow. There's BPM to consider as well as genre.