Simplest way to download and unzip files in Node.js cross-platform?


Question

Just looking for a simple solution to downloading and unzipping .zip or .tar.gz files in Node.js on any operating system.

Not sure if this is built in or I have to use a separate library. Any ideas? Looking for just a couple lines of code so when the next zip file comes that I want to download in node, it's a no brainer. Feel like this should be easy and/or built in, but I can't find anything. Thanks!

1
47
4/25/2012 1:13:06 AM

Accepted Answer

Checkout adm-zip.

ADM-ZIP is a pure JavaScript implementation for zip data compression for NodeJS.

The library allows you to:

  • decompress zip files directly to disk or in-memory buffers
  • compress files and store them to disk in .zip format or in compressed buffers
  • update content of/add new/delete files from an existing .zip
29
8/8/2018 11:02:23 AM

It's 2017 (October 26th, to be exact).

For an ancient and pervasive technology such as unzip I would expect there to exist a fairly popular, mature node.js unzip library that is "stagnant" and "unmaintained" because it is "complete".

However, most libraries appear either to be completely terrible or to have commits recently as just a few months ago. This is quite concerning... so I've gone through several unzip libraries, read their docs, and tried their examples to try to figure out WTF. For example, I've tried these:

Top Recommendation: yauzl

Works great for completely downloaded file. Not as great for streaming.

Well documented. Works well. Makes sense.

2nd Pick: node-stream-zip

antelle's node-stream-zip seems to be the best

Install:

npm install --save node-stream-zip

Usage:

'use strict';

var StreamZip = require('node-stream-zip');

var zip = new StreamZip({
  file: './example.zip'
, storeEntries: true
});

zip.on('error', function (err) { console.error('[ERROR]', err); });

zip.on('ready', function () {
  console.log('All entries read: ' + zip.entriesCount);
  //console.log(zip.entries());
});

zip.on('entry', function (entry) {
  var pathname = path.resolve('./temp', entry.name);
  if (/\.\./.test(path.relative('./temp', pathname))) {
      console.warn("[zip warn]: ignoring maliciously crafted paths in zip file:", entry.name);
      return;
  }

  if ('/' === entry.name[entry.name.length - 1]) {
    console.log('[DIR]', entry.name);
    return;
  }

  console.log('[FILE]', entry.name);
  zip.stream(entry.name, function (err, stream) {
    if (err) { console.error('Error:', err.toString()); return; }

    stream.on('error', function (err) { console.log('[ERROR]', err); return; });

    // example: print contents to screen
    //stream.pipe(process.stdout);

    // example: save contents to file
    mkdirp(path.dirname(pathname, function (err) {
      stream.pipe(fs.createWriteStream(pathname));
    });
  });
});

Security Warning:

Not sure if this checks entry.name for maliciously crafted paths that would resolve incorrectly (such as ../../../foo or /etc/passwd).

You can easily check this yourself by comparing /\.\./.test(path.relative('./to/dir', path.resolve('./to/dir', entry.name))).

Pros: (Why do I think it's the best?)

  • can unzip normal files (maybe not some crazy ones with weird extensions)
  • can stream
  • seems to not have to load the whole zip to read entries
  • has examples in normal JavaScript (not compiled)
  • doesn't include the kitchen sink (i.e. url loading, S3, or db layers)
  • uses some existing code from a popular library
  • doesn't have too much senseless hipster or ninja-foo in the code

Cons:

  • Swallows errors like a hungry hippo
  • Throws strings instead of errors (no stack traces)
  • zip.extract() doesn't seem to work (hence I used zip.stream() in my example)

Runner up: node-unzipper

Install:

npm install --save unzipper

Usage:

'use strict';

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

fs.createReadStream('./example.zip')
  .pipe(unzipper.Parse())
  .on('entry', function (entry) {
    var fileName = entry.path;
    var type = entry.type; // 'Directory' or 'File'

    console.log();
    if (/\/$/.test(fileName)) {
      console.log('[DIR]', fileName, type);
      return;
    }

    console.log('[FILE]', fileName, type);

    // TODO: probably also needs the security check

    entry.pipe(process.stdout/*fs.createWriteStream('output/path')*/);
    // NOTE: To ignore use entry.autodrain() instead of entry.pipe()
  });

Pros:

  • Seems to work in a similar manner to node-stream-zip, but less control
  • A more functional fork of unzip
  • Seems to run in serial rather than in parallel

Cons:

  • Kitchen sink much? Just includes a ton of stuff that's not related to unzipping
  • Reads the whole file (by chunk, which is fine), not just random seeks

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