I use this call in a javascript function and it works while debugging in Visual Studio 2012 but not when deployed to a Win2008R2 Server running IIS 7.5

var data = JSON.parse(params);
The error is JSON is undefined.

I am using the latest Ext from NuGet which has placed these scripts in my page...

    <script type="text/javascript" src="/dei/extjs/ext-all-js/ext.axd?v=41036"></script>
    <script type="text/javascript" src="/dei/extnet/extnet-all-js/ext.axd?v=41036"></script>
    <script type="text/javascript" src="/dei/extnet/locale/ext-lang-en-js/ext.axd?v=41036"></script>
    <script type="text/javascript" src="/dei/ux/boxreorderer/boxreorderer-js/ext.axd?v=41036"></script>
    <script type="text/javascript" src="/dei/ux/tabscrollermenu/tabscrollermenu-js/ext.axd?v=41036"></script>
    <script type="text/javascript" src="/dei/ux/clearbutton/clearbutton-js/ext.axd?v=41036"></script>
    <script type="text/javascript" src="/dei/ux/filterheader/filterheader-js/ext.axd?v=41036"></script>
I also tried to switch the call to $.parseJSON(params) and that also works in the debugger but not when deployed.

Does anyone have a suggestion on what to look for next?