Fiddle JSON Mocking

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/knockout/3.1.0/knockout-min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/knockout.mapping/2.4.1/knockout.mapping.min.js"></script>
 <div data-bind='foreach: news'>
     <span data-bind="text: title" ></span>
</div>

JavaScript

var vm = {
    news: ko.observableArray()
}

ko.applyBindings(vm);

var rawData = [{title: "Title 1"}, {title: "Title 2"}];

 new Request.JSON({
    url: '/echo/json/',
    data: {
        json: JSON.encode(rawData),
        delay: 1
    },
    onSuccess: function(response) {
        console.log(response)
        var data = ko.mapping.fromJS(response);
         
        vm.news(data())
    }
}).send();