Write archives
Create browser-downloadable ZIP files with ZipWriter, choose compression level, preserve timestamps and comments, and return Blob, Response, ReadableStream, Uint8Array, or ArrayBuffer.
JSZipp - ZIPs in the modern browser
JSZipp gives web apps fast ZIP creation and inspection without pulling in a heavyweight bundle. Work with large, modern ZIP64-scale archives and catch dangerous paths, zip bombs, and malformed layouts before they reach your app.
safe reader defaults
Blob / Response / Stream output
ZIP64
no dependencies
Read uploads
Open user-selected files with openZip(), reject unsafe paths by default, cap archive and entry sizes, and read entries with text(), bytes(), arrayBuffer(), or stream().
Use browser primitives
JSZipp targets modern browser APIs: Web Streams, Blob, TextEncoder, TextDecoder, AbortSignal, and DecompressionStream (platform decompression for deflated reads).
Example
import { ZipWriter } from "web-jszipp";
const writer = new ZipWriter({ outputAs: "blob" });
await writer.add({ path: "Hello.txt", data: "Hello World\n" });
const smileBytes = Uint8Array.from(atob(imgData), (char) => char.charCodeAt(0));
await writer.add({ path: "images/smile.gif", data: smileBytes });
const content = await writer.close();
saveAs(content, "example.zip");Getting help
- Start with the FAQ for common usage and compatibility questions.
- Use the API page when you need method and option names.
- Check examples for common browser workflows.
- Report reproducible problems through the bug tracker.