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copied!<p>Certainly Brian's answer is the correct one, however if you already are using the Json.Net formatter, which gives you pretty json dates and faster serialization, then you can't just add a second formatter for jsonp, you have to combine the two. It is a good idea to use it anyway, as Scott Hanselman has said that the release of ASP.NET Web API is going to use the Json.Net serializer by default.</p> <pre><code>public class JsonNetFormatter : MediaTypeFormatter { private JsonSerializerSettings _jsonSerializerSettings; private string callbackQueryParameter; public JsonNetFormatter(JsonSerializerSettings jsonSerializerSettings) { _jsonSerializerSettings = jsonSerializerSettings ?? new JsonSerializerSettings(); // Fill out the mediatype and encoding we support SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json")); Encoding = new UTF8Encoding(false, true); //we also support jsonp. SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/javascript")); MediaTypeMappings.Add(new UriPathExtensionMapping("jsonp", "application/json")); } public string CallbackQueryParameter { get { return callbackQueryParameter ?? "jsoncallback"; } set { callbackQueryParameter = value; } } protected override bool CanReadType(Type type) { if (type == typeof(IKeyValueModel)) return false; return true; } protected override bool CanWriteType(Type type) { return true; } protected override Task<object> OnReadFromStreamAsync(Type type, Stream stream, HttpContentHeaders contentHeaders, FormatterContext formatterContext) { // Create a serializer JsonSerializer serializer = JsonSerializer.Create(_jsonSerializerSettings); // Create task reading the content return Task.Factory.StartNew(() => { using (StreamReader streamReader = new StreamReader(stream, Encoding)) { using (JsonTextReader jsonTextReader = new JsonTextReader(streamReader)) { return serializer.Deserialize(jsonTextReader, type); } } }); } protected override Task OnWriteToStreamAsync(Type type, object value, Stream stream, HttpContentHeaders contentHeaders, FormatterContext formatterContext, TransportContext transportContext) { string callback; var isJsonp = IsJsonpRequest(formatterContext.Response.RequestMessage, out callback); // Create a serializer JsonSerializer serializer = JsonSerializer.Create(_jsonSerializerSettings); // Create task writing the serialized content return Task.Factory.StartNew(() => { using (JsonTextWriter jsonTextWriter = new JsonTextWriter(new StreamWriter(stream, Encoding)) { CloseOutput = false }) { if (isJsonp) { jsonTextWriter.WriteRaw(callback + "("); jsonTextWriter.Flush(); } serializer.Serialize(jsonTextWriter, value); jsonTextWriter.Flush(); if (isJsonp) { jsonTextWriter.WriteRaw(")"); jsonTextWriter.Flush(); } } }); } private bool IsJsonpRequest(HttpRequestMessage request, out string callback) { callback = null; if (request.Method != HttpMethod.Get) return false; var query = HttpUtility.ParseQueryString(request.RequestUri.Query); callback = query[CallbackQueryParameter]; return !string.IsNullOrEmpty(callback); } } </code></pre>

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