Don't waste your time

[csvan]

This does not actually generate XLSX files. Move on.

[codebeautify]

I agree.

[albertvazquezm]

Does anybody have a good alternative that properly supports xlsx generation?

[BorisTB]

This looks good https://medium.com/@Nopziiemoo/create-excel-files-using-javascript-without-all-the-fuss-2c4aa5377813

https://github.com/egeriis/zipcelx