(JSON.stringify) ---> (asp.net function) ----> (JSON.parse) ---->Microsoft JScript runtime error: Invalid character

Question

I have a simple javascript object. I serialize it with JSON.stringify I send it to a asp.net web function that just return it. But when I try to parse the returned string with JSON i get

Microsoft JScript runtime error: Invalid character

 $(document).ready(function() {
          $.ajax({
              type: "POST",
              url: "test.aspx/PassBackdata",
              contentType: "application/json; charset=utf-8",
              data: "{'args': '" + JSON.stringify(MyObject) + "'}",
                   dataType: "json",
                   success: AjaxSucceeded,
                   error: AjaxFailed
               }); 
           });
           function AjaxSucceeded(result) {

            var a=JSON.parse(result);

           }
           function AjaxFailed(result) {
               alert(result.status + ' ' + result.statusText);
           }  


      };




  <System.Web.Services.WebMethod()> _
    Public Shared Function PassBackdata(args As String)
            Return args
     End Function

How can I solve this problem? Thank you

mslliviu · Accepted Answer · 2012-05-22 06:46:02Z

3

If the error occurs on succes function, you may want to check the format of the result object. I had to use var a=JSON.parse(result.d); because that is how it was returned by webservice, it wasn't a direct json, but an object with a "d" field which was the json.

For checking the result I use fiddler.

answered May 22, 2012 at 6:46

mslliviu

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1 Comment

Sayan Over a year ago

I experienced it too! Weird!

Ja͢ck · Accepted Answer · 2012-05-22 05:35:09Z

0

Instead of:

"{'args': '" + JSON.stringify(MyObject) + "'}"

Try this:

JSON.stringify({args: MyObject})

Don't do yourself what JavaScript can do for you ;)

answered May 22, 2012 at 5:35

Ja͢ck

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Comments

moribvndvs · Accepted Answer · 2012-05-22 05:36:04Z

0

It would help to know what MyObject looks like, however:

JSON must have key names in double quotes, not single quotes. Try something like this instead:

$(document).ready(function() {
          $.ajax({
              type: "POST",
              url: "test.aspx/PassBackdata",
              contentType: "application/json; charset=utf-8",
              data: JSON.stringify({args:MyObject}),
                   dataType: "json",
                   success: AjaxSucceeded,
                   error: AjaxFailed
               }); 
           });
           function AjaxSucceeded(result) {

            var a=JSON.parse(result);

           }
           function AjaxFailed(result) {
               alert(result.status + ' ' + result.statusText);
           }  


      };

answered May 22, 2012 at 5:36

moribvndvs

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2 Comments

Marky68 Over a year ago

with data: JSON.stringify({args:MyObject}) i get an error 500 error internal server. The strange thing is that the string I send is exactly the same as what i receive. I do not understand the invalid character error message.

Marky68 Over a year ago

with data: JSON.stringify({args:MyObject}) i get an error 500 error internal server. The strange thing is that the string I send is exactly the same as what i receive. I do not understand the invalid character error message. If I stringify and parse immediatly all work whell. If i send back the string to an asp.net function and the function sends it back as it is the received string can not be parsed with JSON even if it looks identical may be it is related with utf-8, does something to change it

Eric · Accepted Answer · 2016-12-16 03:56:48Z

0

if I do: JSON.parse(result.d) instead of JSON.parse(result) it works.

function AjaxSucceeded(result) {

    var a=JSON.parse(result.d);

}

don't know why

edited Dec 16, 2016 at 3:56

Eric

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answered May 23, 2012 at 9:17

Marky68

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