Client-side CSV Download

download_csv.js

const exportRows = [
  ["Name", "Email"],
  ["Foo Bar", "foo@bar.com"]
];

const csvContent = "data:text/csv;charset=utf-8," + exportRows.map((e) => e.join(",")).join("\n");
const encodedUri = encodeURI(csvContent);
const link = document.createElement("a");
link.setAttribute("href", encodedUri);
link.setAttribute("download", "export.csv"); // https://caniuse.com/#feat=download
document.body.appendChild(link); // FF aparently needs this.
link.click();
document.body.removeChild(link);