json post simple

(function ($) {
    $.postJSON = function (url, data) {
        var o = {
            url: url,
            type: "POST",
            dataType: "json",
            contentType: 'application/json; charset=utf-8'
        };
        if (data !== undefined) {
            o.data = JSON.stringify(data);
        }
        return $.ajax(o);
    };
} (jQuery));

//estrutura de exemplo:

$.postJSON('/post/url', {param1: "hello", param2: "world"})
    .complete(function () {
        // Optional - fires when the operation completes, regardless of status
    })
    .success(function () {
        // Optional - fires when operation completes successfully
    })
    .error(function () {
        // Optional - fires when operation completes with error
    });