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Oct 23, 2012

Author: Hirvesh Posted At: 10/23/2012 Tags: , , , , , , , , , , , , , , ,

DownloadBuilder.js - A Library For Concatenated Single File BUIlds For Front-end Projects


DownloadBuilder.js is a JavaScript library that uses the HTML5 Filesystem API to create concatenated single file custom builds for front-end projects.

The library currently supports concatenating local files (supported in all major browsers) and/or files from Github (not supported in IE unless you use a window.atob polyfill). The library also uses Session Storage to provide an option to cache ajax/jsonp requests. If you are using a browser that does not support the HTML5 Filesystem, the text of the concatenated file will still be available to provide users with the custom build code, just not a separate file link to it.


  • Supports Blob URL creation
  • Supports concatenating local files and/or files from Github
  • Supports caching ajax/jsonp requests via Session Storage
  • Library independent

Browser Support

Only Google Chrome fully supports the HTML5 Filesystem API. This means that only Google Chrome supports creating a custom build url.  All Major Browsers (IE8+, Firefox, Chrome, Safari) support retrieving local files and concatenating them.  Firefox, Chrome, and Safari all support retrieving Github files. If you include the window.atob polyfill, then IE8+ will also support retrieving Github files.

Requirements: HTML5 Filesystem API
License: MIT License

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