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Welcome to Ext JS 4.2!

Ext JS 4.2 is a pure JavaScript application framework that works on all modern browsers from IE6 to the latest version of Chrome. It enables you to create the best cross-platform applications using nothing but a browser, and has a phenomenal API.

This is the biggest upgrade we've ever made to Ext JS and we think you're going to love it.

View the Examples Discuss Ext JS 4.2 on the forum

What’s New

We have also been posting summaries of new features and changes to our blog:

Learn more on sencha.com

API Docs

Upgrading

First, check out our overview guide to see what has changed.

Sencha also offers training courses and professional services for companies wishing to use Ext JS 4.2.

SDK Updates

Mar 13 2013 Ext 4.2.0 Released
Oct 26 2012 Ext 4.1.3 Released (support subscribers only)
Sep 8 2012 Ext 4.1.2 Released (support subscribers only)
Jul 5 2012 Ext 4.1.1 Released
Apr 24 2012 Ext 4.1.0 Released
Oct 19 2011 Ext 4.0.7 Released
Aug 30 2011 Ext 4.0.6 Released (support subscribers only)
Jul 24 2011 Ext 4.0.5 Released (support subscribers only)
Jun 29 2011 Ext 4.0.4 Released (support subscribers only)
Jun 14 2011 Ext 4.0.3 Released (support subscribers only)
Jun 9 2011 Ext 4.0.2a Released
May 17 2011 Ext 4.0.1 Released
Apr 26 2011 Ext 4.0.0 Final Released