Invalid JSON primitive in Ajax processing

Question

I am getting an error in an ajax call from jQuery   Here is my jQuery function   function DeleteItem RecordId  UId  XmlName  ItemType  UserProfileId        var obj             RecordId  RecordId          UserId  UId          UserProfileId  UserProfileId          ItemType  ItemType          FileName  XmlName            var json   Sys Serialization JavaScriptSerializer serialize obj          ajax           type   POST           url   EditUserProfile aspx DeleteRecord           data  json          contentType   application json  charset utf-8           dataType   json           async  true          cache  false          success  function msg                if  msg d    null                    RefreshData ItemType  msg d                                    error  function XMLHttpRequest  textStatus  errorThrown                alert  error occured during deleting                          and this is my WebMethod    WebMethod  public static string DeleteRecord Int64 RecordId  Int64 UserId  Int64 UserProfileId  string ItemType  string FileName        try           string FilePath   HttpContext Current Server MapPath FileName            XDocument xmldoc   XDocument Load FilePath           XElement Xelm   xmldoc Element  UserProfile            XElement parentElement   Xelm XPathSelectElement ItemType     Fields              from BO in parentElement Descendants  Record            where BO Element  Id   Attribute  value   Value    RecordId ToString            select BO  Remove            XDocument xdoc   XDocument Parse Xelm ToString    LoadOptions PreserveWhitespace           xdoc Save FilePath            UserInfoHandler obj   new UserInfoHandler            return obj GetHTML UserId  UserProfileId  FileName  ItemType  RecordId  Xelm  ToString          catch  Exception ex            HandleException LogError ex   EditUserProfile aspx    DeleteRecord              return  success       Can anybody please tell me what s wrong in my code   I am getting this error          Message   Invalid JSON primitive  RecordId         StackTrace           at System Web Script Serialization JavaScriptObjectDeserializer DeserializePrimitiveObject          at System Web Script Serialization JavaScriptObjectDeserializer DeserializeInternal Int32 depth         at System Web Script Serialization JavaScriptObjectDeserializer BasicDeserialize String input  Int32 depthLimit  JavaScriptSerializer serializer         at System Web Script Serialization JavaScriptSerializer Deserialize JavaScriptSerializer serializer  String input  Type type  Int32 depthLimit         at System Web Script Serialization JavaScriptSerializer Deserialize T  String input         at System Web Script Services RestHandler GetRawParamsFromPostRequest HttpContext context  JavaScriptSerializer serializer         at System Web Script Services RestHandler GetRawParams WebServiceMethodData methodData  HttpContext context         at System Web Script Services RestHandler ExecuteWebServiceCall HttpContext context  WebServiceMethodData methodData         ExceptionType   System ArgumentException

User · Accepted Answer

Just a guess what does the variable json contain after  var json   Sys Serialization JavaScriptSerializer serialize obj      If it is a valid json object like   foo   foovalue    bar   barvalue   then jQuery might not send it as json data but instead serialize it to foor foovalue amp bar barvalue thus you get the error  Invalid JSON primitive  foo   Try instead setting the data as string    ajax               data     foo   foovalue    bar   barvalue       note the additional quotation marks              This way jQuery should leave the data alone and send the string as is to the server which should allow ASP NET to parse the json server side

User · Answer

As noted by jitter  the   ajax function serializes any object array used as the data parameter into a url-encoded format  Oddly enough  the dataType parameter only applies to the response from the server - and not to any data in the request    After encountering the same problem I downloaded and used the jquery-json plugin to correctly encode the request data to the ScriptService  Then  used the   toJSON function to encode the desired arguments to send to the server      ajax       type   POST       url   EditUserProfile aspx DeleteRecord       data    toJSON obj       contentType   application json  charset utf-8       dataType   json

User · Answer

Here dataTpe is  json  so  data reqParam must be in the form of string while calling API  many as much as object as you want but at last inside   ajax s data stringify the object                let person     name   john                   age  22                            var personStr   JSON stringify person                   ajax                   url    Url Action  METHOD    CONTROLLER                     type   POST                   data  JSON stringify    param1  personStr                      contentType   application json charset utf-8                   dataType   json           success  function  response                 console log  Success                        error  function  error                console log  error found  error                       OR            ajax                   url    Url Action  METHOD    CONTROLLER                     type   POST                   data  personStr                  contentType   application json charset utf-8                   dataType   json           success  function  response                 console log  Success                        error  function  error                console log  error found  error

User · Answer

these answers just had me bouncing back and forth between invalid parameter and missing parameter   this worked for me   just wrap string variables in quotes      data    RecordId  RecordId              UserId  UId              UserProfileId  UserProfileId              ItemType         ItemType                    FileName         XmlName

User · Answer

it s working something like this  data  JSON stringify   id  x

User · Answer

I was facing the same issue  what i came with good solution is as below   Try this       ajax       type   POST       url   EditUserProfile aspx DeleteRecord       data    RecordId      RecordId      UserId      UId      UserProfileId     UserProfileId      ItemType        ItemType        FileName        XmlName              contentType   application json  charset utf-8       dataType   json       async  true      cache  false      success  function msg            if  msg d    null                RefreshData ItemType  msg d                        error  function XMLHttpRequest  textStatus  errorThrown            alert  error occured during deleting                Please note here for string type parameter i have used      escape sequence character for denoting it as string value

User · Answer

If manually formatting JSON  there is a very handy validator here  jsonlint com  Use double quotes instead of single quotes   Invalid          project    a2ab6ef4-1a8c-40cd-b561-2112b6baffd6        franchise    110bcca5-cc74-416a-9e2a-f90a8c5f63a0      Valid          project    a2ab6ef4-1a8c-40cd-b561-2112b6baffd6        franchise    18e899f6-dd71-41b7-8c45-5dc0919679ef

User · Answer

Jquery Ajax will default send the data as query string parameters form like   RecordId 456 amp UserId 123   unless the processData option is set to false  in which case it will sent as object to the server    contentType option is for the server that in which format client has sent the data   dataType option is for the server which tells that what type of data client is expecting back from the server       Don t specify contentType so that server will parse them as query   String parameters not as json    OR     Use contentType as  application json  charset utf-8  and use JSON stringify object  so that server would be able to deserialize json from string

User · Answer

Using  data   JSON stringify obj    in the above situation would have worked I believe   Note  You should add json2 js library all browsers don t support that JSON object  IE7-  Difference between json js and json2 js

User · Answer

I had the same issue  I was calling parent page  Save  from Popup window Close  Found that I was using ClientIDMode  Static  on both parent and popup page with same control id  Removing ClientIDMode  Static  from one of the pages solved the issue

User · Answer

On the Server  to Serialize Deserialize json to custom objects   public static string Serialize lt T gt  T obj        DataContractJsonSerializer serializer   new DataContractJsonSerializer obj GetType         MemoryStream ms   new MemoryStream        serializer WriteObject ms  obj       string retVal   Encoding UTF8 GetString ms ToArray         return retVal     public static T Deserialize lt T gt  string json        T obj   Activator CreateInstance lt T gt         MemoryStream ms   new MemoryStream Encoding Unicode GetBytes json        DataContractJsonSerializer serializer   new DataContractJsonSerializer obj GetType         obj    T serializer ReadObject ms       ms Close        return obj

User · Answer

I guess  jitter was right in his guess  but his solution didn t work for me   Here is what it did work     ajax               data     intFoo      intFoo                       I haven t tried but i think if the parametter is a string it should be like this     ajax               data     intFoo      intFoo      strBar       strBar

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