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. Source: 12 months ago

The ZIP file functionality was implemented using jszip - I'd originally wanted to download the files directly to a folder on the user's filesystem (coming from a scripting background) but turns out unrestricted filesystem access like that isn't something that browsers can do (at least from my limited research). Source: over 1 year ago

Your site went down for maintenance in the middle of my exploring, but here's some feedback so far. 1) The exports (CSV, PDF, etc) should probably include my username and Banano address. Right now there doesn't appear to be any indication of who a downloaded report is tied to. 2) Why do you let me download the database, including column names? If I was an attacker, I could use this to understand your DB layout... Source: over 1 year ago

It uses other utility libraries like Lodash, JSZip and SortableJS. JSZip is used to package the user interface markup into HTML files and other required JavaScript files for a Marketplace App boilerplate in a compressed format and download them from the browser. - Source: dev.to / about 2 years ago

JSZip - JSZip is a javascript library for creating, reading and editing .zip files, with a lovely and simple API. - Source: dev.to / over 2 years ago

I'm really impressed with https://playgroundsessions.com personally. Source: over 3 years ago