Download the sources

You should create a Github account and fork the repository (you will need one to create the pull request).

If you just want the get the source code, you can use git and do git clone to get the sources. You can also download the latest sources here.

Building the project


The dependencies are handled by npm, the first step is to run npm install to get the dependencies. JSZip uses Grunt to handle the build, see here to install its CLI.

Here are the interesting build commands :

  • grunt will generate the final js file in dist/ and the minified version.
  • npm run test-node will run the tests in nodejs.
  • npm run test-browser will the tests in some browsers using SauceLabs, see below.
  • npm run test will run the tests in nodejs and in the browser.
  • npm run lint will use eslint the check the source code.


The documentation uses jekyll on gh-pages. To render the documentation, you need to install jekyll and then run jekyll serve --baseurl ''.

Testing the project

To test JSZip in nodejs, use npm run test-node.

To test JSZip in a browser, you can open the file test/index.html in the browser you want to test. Don’t forget to update the dist/ files with grunt.

You can also test JSZip in a lot of browsers at once with SauceLabs. You will need a SauceLabs account and two variables into your environment. On linux, just use

export SAUCE_USERNAME=your-saucelabs-username
export SAUCE_ACCESS_KEY=your-saucelabs-access-key

before running the npm run test-browser command.

Merging the changes

If you have tested bug fixes or new features, you can open a pull request on Github.

Releasing a new version

  1. In package.json temporarily remove browser["./lib/index"].
  2. Run npm test
    • Locally open http://localhost:8080/test/
    • Or use the SauceLabs configuration above
  3. Update JSZip.version in index.js, index.html and in package.json
  4. Run grunt to generate the new dist files
    • undo the package.json change, it was just needed to replace the __VERSION__ in the header
  5. Undo step 1.
  6. Change version back in package.json (it will get update by the npm command below)
  7. Update
  8. Commit the appropriate changes
  9. Run npm version ... where ... is major, minor, or patch
  10. Run npm publish