Download the latest version of Proj4js here

The library will eventually be distributed as a .zip file, unzip this file in a web-accessible directory and then include the file proj4js-combined.js in your web page. See the UserGuide for more details. Coming soon!

In the meantime, please use the trunk version out of the ​MapBuilder SVN repository at:

​proj4js-compressed.js compressed version

​proj4js-combined.js un-compressed version (better for debugging)

Some example Proj4js definition files are available at: ​lib/defs.

Note: Proj4js currently depends on some core ​OpenLayers classes which are compiled into the file ​OLprotoype.js. If you are using Proj4js in a page that already includes the OpenLayers library, there is no need to include this file, otherwise you must also include OLprototype.js in a <script> tag. The development plan for Proj4js is to factor out this requirement so that the OpenLayers classes will only be required for dynamic lookup of the CRS definitions (see UserGuide).