How can I use JQuery to post JSON data?

Question

I would like to post Json to a web service on the same server. But I don't know how to post Json using JQuery. I have tried with this code:

$.ajax({
    type: 'POST',
    url: '/form/',
    data: {"name":"jonas"},
    success: function(data) { alert('data: ' + data); },
    contentType: "application/json",
    dataType: 'json'
});

But using this JQuery code the data is not received as Json on the server. This is the expected data at the server: {"name":"jonas"} but using JQuery the server receive name=jonas. Or in other words, it's "urlencoded" data and not Json.

Is there any way to post the data in Json format instead of urlencoded data using JQuery? Or do I have to use a manual ajax request?

Answer 1

You're passing an object, not a JSON string. When you pass an object, jQuery uses $.param to serialize the object into name-value pairs.

If you pass the data as a string, it won't be serialized:

$.ajax({
    type: 'POST',
    url: '/form/',
    data: '{"name":"jonas"}', // or JSON.stringify ({name: 'jonas'}),
    success: function(data) { alert('data: ' + data); },
    contentType: "application/json",
    dataType: 'json'
});