JSON data works as string but throws internal error when object

Question

I'm using an AJAX post like this:

$.ajax({
        type: "POST",
        url: "/AJAXServices.aspx/" + method,
        data: params,
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function(data) {
            successfunc();
        },
        error: function(data) {
            errorfunc();
        }
    });

When I use the variable "params" like this:

var params = '{"QuestionID":"' + UpdateQuestion_ID + '", "NewText":"' + newText + '"}';

It works.

But when I change it to this:

var params = { QuestionID: UpdateQuestion_ID, NewText: newText };

This throws an internal server error on the server side:

Failed to load resource: the server responded with a status of 500 (Internal Server Error)

Server side method:

    [WebMethod]
    public static void UpdateQuestion(string QuestionID, string NewText)
    {
        ....
     }

Any ideas?

rckrd · Accepted Answer · 2016-12-24 13:11:27Z

1

I the first case params is a string and in the second case params is an object.

I guess the server expects a valid json string. Make sure params is an object and use JSON.stringify() to convert it to a valid JSON string before sending it.

$.ajax({
    ...
    data: JSON.stringify(params),
    ...
});

edited Dec 24, 2016 at 13:11

answered Dec 24, 2016 at 10:34

rckrd

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1 Comment

Koby Douek Over a year ago

Works. Thanks @rckrd

Ravi Roshan · Accepted Answer · 2016-12-24 10:42:18Z

1

A JavaScript Object and a JSON looks very similar but have minor difference.

A valid JSON must have key wrapped inside "" but a JS Object Key can be written without "".

Below example is a Valid JS Object but Invalid JSON :

{ name: "Ravi", country: "India" }

So, below is a Valid JSON for same :

{ "name": "Ravi", "country": "India" }

Further, Server Side , it would break as it is a InValid JSON.

You can validate your JSON at http://www.jsoneditoronline.org/

Note : You can convert any JS Object to Valid JSON using

JSON.stringify(JavaScript_Object);

Example :

var a = { name: "Ravi", country: "India" }

Convert from JS-Obj to JSON

var b = JSON.stringify(a);

Now, var b is a valid JSON.

Output : "{"name":"Ravi","country":"India"}"

edited Dec 24, 2016 at 10:42

answered Dec 24, 2016 at 10:35

Ravi Roshan

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