7z-wasm

7-Zip WASM

7-Zip compiled to WASM with emscripten. Based on 7-Zip 24.09 (2024-11-29).

• Runs in any JavaScript environment that supports WASM (Browser or NodeJS)
• Supports all file formats that the full 7zz CLI supports.
• Only Emscripten NODEFS and WORKERFS adapters are included by default.

Inspired by https://github.com/sonictruth/7zip.js

Usage

Command-line

npx 7z-wasm --help

or

npm i -g 7z-wasm
7z-wasm --help

As a module

import SevenZip from "7z-wasm";

const sevenZip = await SevenZip();

const archiveData = new Uint8Array(100);
const archiveName = "archive.7z";

const stream = sevenZip.FS.open(archiveName, "w+");
sevenZip.FS.write(stream, archiveData, 0, archiveData.length);
sevenZip.FS.close(stream);

const filesToExtract = ["some-file.txt"];
sevenZip.callMain(["x", archiveName, ...filesToExtract]);
console.log(sevenZip.FS.readFile(filesToExtract[0]));

Working with the real file system (Node.JS only)

import SevenZip from "7z-wasm";

const mountRoot = "/nodefs";
sevenZip.FS.mkdir(mountRoot);
sevenZip.FS.mount(sevenZip.NODEFS, { root: "/real/root/folder" }, mountRoot);
sevenZip.FS.chdir(mountRoot + "/subfolder");

sevenZip.callMain(["x", "archive.7z", "some-file.txt"]);

Building

Because the 7-Zip sources are not available on GitHub, the build process relies on downloading the sources from the 7-Zip website and patching them so they compile with emcc.

• Install docker
• Execute ./build (or .\build, respectively, on Windows CMD)

You can pass custom options to emcc via env file (e.g. see build-umd.env)