How to Send JSON Data with jQuery\'s $.ajax Without Query String Conversion?

JSON Transmission in jQuery: Escaping the Query String Trap

When using jQuery's $.ajax function, it's common to encounter an unexpected behavior where data sent as JSON is automatically converted into a query string. This can be problematic if your application relies on receiving actual JSON objects.

The Misleading 'dataType: 'json'' Attribute

The first instinct is to set the 'dataType' attribute to 'json' to specify the expected data type. However, this only dictates the data type expected from the server, not what you send to it.

Solution: JSON.stringify and Content Type

To resolve this issue, you need to employ JSON.stringify to serialize your JavaScript object into a JSON string. Additionally, you must set the 'contentType' property to 'application/json' to instruct the server that the data being sent is JSON.

$.ajax({
    url: url,
    type: "POST",
    data: JSON.stringify(data),
    contentType: "application/json",
    complete: callback
});

Legacy Support

Modern browsers provide native JSON functionality. However, if legacy support is required, the json2 library can be used to emulate JSON behavior for older environments.

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