Here am getting the result as follows 
Now i want to show that content inside a select box with option values so how can we do that..
Here i have written like this
var data = data.user_contacts
var formoption = "";
$.each(data, function(v) {
var val = data[v]
formoption += "<option value='" + val + "'>" + val + "</option>";
});
$('#user_contacts').html(formoption);
but am getting value as undefined