---
title: Dojo JavaScript framework
slug: cms-11/dev-docs/introduction-to-dojo
docTags: 
createdAt: 2026-07-22T19:45:19.953Z
---

Optimizely Content Management System (CMS) uses the [Dojo Toolkit](http://dojotoolkit.org/) as the JavaScript framework to develop on the client side.

The Dojo toolkit is a client-side framework for building rich internet applications hosted in a web browser. Dojo is an open-source framework that helps speed up the development of cross-platform rich internet applications by giving you a lot of features. Some key features include:

- Rich UI widgets using the Dijit widget system
- Asynchronous communication
- Class declaration and modular development
- Desktop and mobile support

The Dojo Toolkit consists of three main components:

- *Dogo* is the framework's core API and contains features for DOM manipulation, class declaration, event listening, message publishing and subscription, and asynchronous requests and processing.
- *Dijit* is the user interface system built on the Dojo core. Its primary feature is the widget system, which manages and manipulates visual elements in a modular manner.
- *Dojox* is a collection of sub-projects built on top of the Dojo core. It can be considered a repository of Dojo plugins or a testing ground for new features that will eventually become part of the Dojo or Dijit namespace.

## Resources

Dojo offers a selection of tutorials, blogs, and other resources that help new developers familiarize themselves with the framework.

- [API](http://dojotoolkit.org/api/) – The Dojo API documentation is generated from the code and lets you go to the objects within the framework.
- [Blog Posts](http://www.sitepen.com/blog/) – Many blogs about Dojo features exist online. Search for a topic that interests you. Sitepen is dedicated to Dojo development and has an excellent series of blog posts for anyone new to it called their [quick start guide](http://www.sitepen.com/blog/series/dojo-quick-start-guide/).
- [Bug Tracking](http://bugs.dojotoolkit.org/) – The bug tracking system helps you when you discover some strange behavior because there may already be a patch for the issue.