Why do I keep getting an "undefined" error with this JSONP feed?

I am using the following code to retrieve data in JSONP format. I need to use it so if no data is returned, I can flag the error. I was using jQuery's ajax(), but it always returns 404 pages as being successful, so I need to use the jquery-jsonp jQuery plug-in on Goog开发者_StackOverflow社区le Code for error handling.

I borrowed the code from the example on jQuery ajax (jsonp) ignores a timeout and doesn't fire the error event, but I cannot seem to get it to work with my JSON, which is being sent as the MIME type "application/json" from the other server.

$(function(){
    var jsonFeed = "http://othersite.com/feed.json";

    $.jsonp({
        url: jsonFeed,
        dataType: "jsonp",
        timeout: 5000,
        success: function(data, status){
            $.each(data.items, function(i,item){
                console.log("Title: " + item.title);

                if (i == 9) return false;
            });
        },
        error: function(XHR, textStatus, errorThrown){
            console.log("Error Status: " + textStatus);
            console.log("Error Thrown: " + errorThrown);
        }
    });
});

Here is an example of my JSON:

[ { "title" : "My Title" } ]

Can anyone spot the problem?

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Are you sure "othersite.com" actually supports JSONP. JSON cannot be converted to JSONP by the client. The server needs to support it be wrapping the content with a callback function.