unzipper

What is unzipper?

The unzipper npm package is a module that provides streaming APIs for unzipping .zip files. It allows for extracting the contents of zip files, parsing zip file structures, and more, all while being memory efficient and fast.

What are unzipper's main functionalities?

Extracting zip files

This feature allows you to extract the contents of a zip file to a specified directory. The code sample demonstrates how to read a zip file as a stream and pipe it to the unzipper's Extract method, which will extract the files to the given path.

const unzipper = require('unzipper');
const fs = require('fs');

fs.createReadStream('path/to/archive.zip')
  .pipe(unzipper.Extract({ path: 'output/path' }));

Parsing zip file entries

This feature allows you to parse the contents of a zip file and work with each entry individually. The code sample shows how to read entries from a zip file and handle them based on their type, either extracting files or draining directories.

const unzipper = require('unzipper');

fs.createReadStream('path/to/archive.zip')
  .pipe(unzipper.Parse())
  .on('entry', function (entry) {
    const fileName = entry.path;
    const type = entry.type; // 'Directory' or 'File'
    if (type === 'File') {
      entry.pipe(fs.createWriteStream('output/path/' + fileName));
    } else {
      entry.autodrain();
    }
  });

Buffer-based extraction

This feature allows you to extract files from a zip file that is already loaded into a buffer. The code sample demonstrates how to open a zip file from a buffer and then extract the contents of the first file into another buffer.

const unzipper = require('unzipper');

unzipper.Open.buffer(buffer)
  .then(function (directory) {
    return directory.files[0].buffer();
  })
  .then(function (contentBuffer) {
    // Use the contentBuffer
  });

Other packages similar to unzipper

adm-zip

adm-zip is a JavaScript implementation for zip data compression for NodeJS. It provides functionalities similar to unzipper, such as reading and extracting zip files. Unlike unzipper, which is stream-based, adm-zip works with in-memory buffers, which can be less efficient for large files.

jszip

jszip is a library for creating, reading, and editing .zip files with JavaScript, with a focus on client-side use. It can be used in NodeJS as well. It offers a more comprehensive API for handling zip files compared to unzipper, including the ability to generate zip files, but it might not be as optimized for streaming large zip files.

yauzl

yauzl is another NodeJS library for reading zip files. It focuses on low-level zip file parsing and decompression, providing a minimal API. It's designed to be more memory efficient than adm-zip by using lazy parsing, but it doesn't provide the high-level convenience methods that unzipper does.

README

unzip

This is a temporary fork of node-unzip to address finish and close event of the unzip stream.

Streaming cross-platform unzip tool written in node.js.

Unzip provides simple APIs similar to node-tar for parsing and extracting zip files. There are no added compiled dependencies - inflation is handled by node.js's built in zlib support. Unzip is also an example use case of node-pullstream.

Installation

$ npm install unzip

Quick Examples

Extract to a directory

fs.createReadStream('path/to/archive.zip').pipe(unzip.Extract({ path: 'output/path' }));

Extract emits the 'close' event once the zip's contents have been fully extracted to disk.

Parse zip file contents

Process each zip file entry or pipe entries to another stream.

Important: If you do not intend to consume an entry stream's raw data, call autodrain() to dispose of the entry's contents. Otherwise you risk running out of memory.

fs.createReadStream('path/to/archive.zip')
  .pipe(unzip.Parse())
  .on('entry', function (entry) {
    var fileName = entry.path;
    var type = entry.type; // 'Directory' or 'File'
    var size = entry.size;
    if (fileName === "this IS the file I'm looking for") {
      entry.pipe(fs.createWriteStream('output/path'));
    } else {
      entry.autodrain();
    }
  });

Or pipe the output of unzip.Parse() to fstream

var readStream = fs.createReadStream('path/to/archive.zip');
var writeStream = fstream.Writer('output/path');

readStream
  .pipe(unzip.Parse())
  .pipe(writeStream)

License

(The MIT License)

Copyright (c) 2012 - 2013 Near Infinity Corporation

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.