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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.
You can use a lib named JSZip : https://stuk.github.io/jszip/ You can add binary data (your audio slice) inside a zip like that
You likely want something like https://github.com/Kagami/ffmpeg.js/ for extracting slices
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