How can I use JQuery to post JSON data?

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?

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'
});

Base on lonesomeday's answer, I create a jpost that wraps certain parameters.

$.extend({
    jpost: function(url, body) {
        return $.ajax({
            type: 'POST',
            url: url,
            data: JSON.stringify(body),
            contentType: "application/json",
            dataType: 'json'
        });
    }
});

Usage:

$.jpost('/form/', { name: 'Jonh' }).then(res => {
    console.log(res);
});

you can post data using ajax as :

 $.ajax({
   url: "url", 
   type: "POST",
   dataType: "json",
   contentType: "application/json; charset=utf-8",
   data: JSON.stringify({ name: 'value1', email: 'value2' }),
   success: function (result) {
       // when call is sucessfull
    },
    error: function (err) {
    // check the err for error details
    }
 }); // ajax call closing