Working with ZIP Files Entirely in the Browser Using JSZip

ZIP compression in the browser used to require a server round-trip. JSZip changed that. Here's a practical guide to creating and extracting ZIPs client-side. import JSZip from 'jszip'; async function createZip(files) { const zip = new JSZip(); for (const file of files) { const buffer = await file.arrayBuffer(); zip.file(file.name, buffer, { compression: 'DEFLATE', compressionOptions: { level: 6 } }); } const blob = await zip.generateAsync({ type: 'blob', compression: 'DEFLATE', compressionOptions: { level: 6 } }); return blob; } Compression level 6 is the DEFLATE default — a good balance betwe