Controller.Json Method (Object, String)

Creates a JsonResult object that serializes the specified object to JavaScript Object Notation (JSON) format.

Namespace:  System.Web.Mvc
Assembly:  System.Web.Mvc (in System.Web.Mvc.dll)


Protected Friend Function Json ( _
    data As Object, _
    contentType As String _
) As JsonResult
protected internal JsonResult Json(
    Object data,
    string contentType
protected public:
JsonResult^ Json(
    Object^ data, 
    String^ contentType


  • data
    Type: System.Object
    The JavaScript object graph to serialize.

Return Value

Type: System.Web.Mvc.JsonResult
The JSON result object that serializes the specified object to JSON format.


The data parameter must be serializable. The JavaScriptSerializer class is used to serialize the object. The result object that is prepared by this method is written to the response by the MVC framework when the object is executed.


The following example shows how to send JSON-formatted data to the browser.

public ActionResult TestJsonContent() {
    return View("TestJson");

public ActionResult TestJsonContent(int numDays) {
    List<double> list = new List<double>();

    for (double d = 0; d < numDays; d++)
        list.Add(d + .5);

    return Json(list, "text/x-json");
Public Function TestJsonContent() As ActionResult 
    Return View("TestJson") 
End Function 

<AcceptVerbs(HttpVerbs.Post)> _ 
Public Function TestJsonContent(ByVal numDays As Integer) As ActionResult 
    Dim list As New List(Of Double)() 
    For d As Double = 0 To numDays - 1 
        list.Add(d + 0.5) 
    Return Json(list, "text/x-json") 
End Function

See Also


Controller Class

Json Overload

System.Web.Mvc Namespace