pass function in json and execute

Here's a working example

Basically, you have to be careful with this sort of thing. If you take an extant javascript function, turn it to a string, and eval it, you might run into function redeclaration issues. If you are simply taking a function string from the server and you want to run it, you can do as I did on that jsfiddle:

Javascript

var myFunc = "function test() {alert('test');}";

$(document).ready(function() {
    var data = new Object();
    data.func = myFunc;
    var jsonVal = $.toJSON(data);
    var newObj = $.evalJSON(jsonVal);
    eval(newObj.func);
    test();
});​

take a look at the JSONfn plugin.

http://www.eslinstructor.net/jsonfn/

it does exactly what you're asking for.

-Vadim