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How JSZip represents an archive
The JSZip project describes its library as “a javascript library for creating, reading and editing .zip files, with a lovely and simple API.” The project page lists version 3.10.2: JSZip project.
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A JSZip instance holds archive entries in memory. Create one with new JSZip(); use file(name, data) to add a file. Add a directory with folder(name), or use slash-separated paths such as images/note.txt. The file data documentation also covers supported inputs, including browser Blob and File objects.
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Install JSZip and FileSaver.js in your project, then generate a Blob and hand it to FileSaver.js. FileSaver is a separate helper; it is not part of JSZip.
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import JSZip from "jszip";
import { saveAs } from "file-saver";
const zip = new JSZip();
zip.file("hello.txt", "Hello worldn");
zip.folder("images").file("note.txt", "Files can be grouped in folders.");
const blob = await zip.generateAsync({ type: "blob" });
saveAs(blob, "example.zip");The await is important: generateAsync() returns a Promise that resolves to the requested archive representation. The documented browser flow is Blob generation followed by saveAs(blob, "filename.zip"). See the JSZip write guide and generation options.
Choose a suitable output type
- For a browser download, use
type: "blob". - In Node.js, use
type: "nodebuffer"and write the Buffer with Node’s filesystem API. - For another API, choose a supported byte-array representation that matches what it expects. Browser support for output types can vary; check
JSZip.support.
The JSZip guide also documents a data-URL download approach, but notes its length and filename limitations. For a modern browser download, the Blob-and-FileSaver route is the documented choice.
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How to read a ZIP and extract a file
Pass the archive data to loadAsync(), then call async(outputType) on the entry you want. Both steps are asynchronous, so await their Promises or chain them.
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const zip = await JSZip.loadAsync(fileOrArrayBuffer);
const entry = zip.file("hello.txt");
if (!entry) {
throw new Error("hello.txt is not in the archive");
}
const text = await entry.async("string");loadAsync() resolves to the loaded archive. Looking up a missing path with zip.file(name) returns no file object, so check for the entry before calling async(). Choose the output type for the extracted data according to how the application will use it. See the archive loading documentation and JSZip FAQ and examples.
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Load files selected in a browser
JSZip accepts browser File inputs. A file input’s selected files can be passed to loadAsync() to open an archive, or added directly as entries when creating a new archive. The read guide shows the archive-loading workflow; the file data documentation covers adding file inputs.
How to generate a ZIP in Node.js
For a Buffer suitable for Node.js APIs, request nodebuffer, then write it using the filesystem module.
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import JSZip from "jszip";
import { writeFile } from "node:fs/promises";
const zip = new JSZip();
zip.file("hello.txt", "Hello worldn");
const buffer = await zip.generateAsync({ type: "nodebuffer" });
await writeFile("example.zip", buffer);For streamed output to a file, JSZip’s Node.js guide demonstrates generateNodeStream() piped into a writable file stream. See the write guide.
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Generation supports STORE (no compression) and DEFLATE. Set compressionOptions: { level: 1..9 } to choose a DEFLATE level. Changing the generation level does not recompress entries that are already compressed to a different level. Consult the generation options for the option details.
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By default, streamFiles is false: JSZip holds processed file data in memory during generation. Setting streamFiles: true can reduce memory use by using ZIP data descriptors, but some ZIP readers may not support those descriptors. This is a compatibility trade-off, not a guarantee that JSZip can handle arbitrarily large archives efficiently. Test the intended archive sizes and target readers before relying on streamed generation. The advanced usage guide describes the streaming behavior.
Handle imported ZIP paths safely
Starting with JSZip 3.8.0, imported filenames containing .. path components are sanitized to mitigate ZIP Slip. The original path remains available as unsafeOriginalName; use the sanitized entry name for subsequent processing and do not assume an archive’s supplied paths are safe. This library behavior is a protective measure, not a general security guarantee for every operation your application performs. See the loadAsync documentation.
Use the Promise-based API in current JSZip
JSZip 3 moved generation, archive loading, and entry reads to Promise-based methods: generateAsync(), loadAsync(), and async(). Examples using older synchronous APIs need updating to await or chain these methods. Consult the upgrade guide when adapting legacy code.
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