assign json object

hi i creating json object in the page load in the code behind
how to assing this json object to javascript 
json object.
this is javasctipt create json object
var dynmFields = { "Fields": [], "Texts": [] }; and this is in code behind create json obect and Serialize 
Dim js As New JavaScriptSerializer Dim strFields As String = js.Serialize(index_Datas) Dim strTexts As String = js.Serialize(text_Datas) Dim jsonString As String = "{ ""Fields"": " & strFields & ", ""Texts"": " & strTexts & " }" jsonStringHidden.Value = jsonString this is in javascript assing hidden field jsongStringHidden to json variable
dynmFields = $("#jsonStringHidden").val();

but after i assing the hid ...