how to properly send JSON via ajax to c# [WebMethod]?

Question

I want to send a JSON string via ajax to [WebMethod]. My JSON values contain double quotation marks ("). In js, I create an object and convert it to JSON with JSON.stringify(my_object). Console shows properly formatted JSON (double quotes are masked with \), jsonlint.com confirms it.

But the problem appears in [WebMethod]. After hours of debugging I found out that it ignores masked " and treats them as normal ". So my properly JSON-formatted string becomes not properly JSON-formatted string.

Is there a way to fix this? Changing my input string is not an option (I mustn't get rid of ").

Here's some code:

ajax request:

$.ajax({
    type: 'POST',
    url: 'Test_Page.aspx/Test',
    data: "{json: '" + JSON.stringify(json_string) + "'}",
    contentType: 'application/json; charset=utf-8',
    dataType: 'json',
    success: function (msg) {},
    error: function (msg) {}
});

web method:

[WebMethod]
public static string Test(string json) {
    return Newtonsoft.Json.JsonConvert.SerializeObject(Other_Function(json));
}

Answer 1

Try this:

$.ajax({
    type: 'POST',
    url: 'Test_Page.aspx/Test',
    data: JSON.stringify({json: json_string}),
    contentType: 'application/json; charset=utf-8',
    dataType: 'json',
    success: function (msg) {},
    error: function (msg) {}
});