Usage

    //Javascript
    function remoteLog(msg) {
        $.ajax({
            url: "http://log.testmaskin.com/home/Log",
            data: { message: msg },
            dataType: "jsonp"
        });
        window.console && console.log(msg);
    }
    //c#
    public static class Logger
    {
        public static HttpClient client = new HttpClient();
        public static string GetJson(this object o)
        {
            try
            {
                var serializer = new JsonSerializer
                {
                    NullValueHandling = NullValueHandling.Ignore,
                    Formatting = Formatting.Indented,
                    ObjectCreationHandling = ObjectCreationHandling.Replace,
                    MissingMemberHandling = MissingMemberHandling.Ignore,
                    ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
                    DateFormatHandling = 0,
                    DateFormatString = "dd.MM.yyyy"
                };
                using (var sw = new StringWriter())
                using (var writer = new JsonTextWriter(sw))
                {
                    serializer.Serialize(writer, o);
                    return sw.ToString();
                }
            }
            catch (Exception err)
            {
                return "{ \"msg\" : \"" + err.Message + "\n" + err.StackTrace.Replace("\\", "\\\\") + "\"}";
            }
        }
        public static void Log(this object msg)
        {
            var m = new StringContent(new { message = msg.GetJson() }.GetJson(), Encoding.UTF8, "application/json");
            client.PostAsync("http://log.testmaskin.com/home/log", m);
        }
    }
    Logger.Log(new {msg="Hello world!"});