JQuery AJAX JSON response returns d key

When I make a jQuery AJAX JSON request, it responds with the "d" attribute.

Why is this?

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json jquery get asp.net-ajax
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here is a good article about it http://encosia.com/2009/06/29/never-worry-about-asp-net-ajaxs-d-again/

". d" what? If you are familiar with ".d", I mean, it's just a security feature added by Microsoft in ASP.NET 3.5s version of ASP.NET AJAX. By encapsulating the JSON response within the parent, the framework helps protect against the particularly hideous XSS vulnerability.

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If you are familiar with “.d,” I mean, it's just a security feature added by Microsoft in ASP.NET 3.5s version of ASP.NET AJAX. By encapsulating the JSON response in the parent, the framework helps protect against an especially unpleasant XSS vulnerability.

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