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An object-oriented JavaScript framework

Prototype is a JavaScript framework that aims to ease development of dynamic web applications. It offers a familiar class-style OO framework, extensive Ajax support, higher-order programming constructs, and easy DOM manipulation.

Targeted platforms

Prototype currently targets the following platforms:

  • Microsoft Internet Explorer for Windows, version 6.0 and higher

  • Mozilla Firefox 1.5 and higher

  • Apple Safari 2.0 and higher

  • Opera 9.25 and higher

Using Prototype

To use Prototype in your application, download the latest release from the Prototype web site ( and copy dist/prototype.js to a suitable location. Then include it in your HTML like so:

<script type="text/javascript" src="/path/to/prototype.js"></script>

Building Prototype from source

prototype.js is a composite file generated from many source files in the src/ directory. To build Prototype, you'll need:

  • a copy of the Prototype source tree, either from a distribution tarball or from the GitHub repository

  • Ruby 1.8.2 or higher (

  • Rake – Ruby Make (

  • RDoc, if your Ruby distribution does not include it

From the root Prototype directory,

  • rake dist will preprocess the Prototype source using ERB and generate the composite dist/prototype.js.

  • rake package will create a distribution tarball in the pkg/ directory.

Contributing to Prototype

Check out the Prototype source with

$ git clone git://

Find out how to contribute:


Please see the online Prototype API:
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