$.fn.serializeObject

Much like $.serialize, but it serializes into JSON object instead of a string;

HTML

<h2>Form</h2>
<form action="" method="post">
    First Name:<input type="text" name="Fname" maxlength="12" size="12"/> <br/>
    Last Name:<input type="text" name="Lname" maxlength="36" size="12"/> <br/>
    Gender:<br/>
    Male:<input type="radio" name="gender" value="Male"/><br/>
    Female:<input type="radio" name="gender" value="Female"/><br/>
    Favorite Food:<br/>
    Steak:<input type="checkbox" name="food[]" value="Steak"/><br/>
    Pizza:<input type="checkbox" name="food[]" value="Pizza"/><br/>
    Chicken:<input type="checkbox" name="food[]" value="Chicken"/><br/>
    <textarea wrap="physical" cols="20" name="quote" rows="5">Enter your favorite quote!</textarea><br/>
    Select a Level of Education:<br/>
    <select name="education">
        <option value="Jr.High">Jr.High</option>
        <option value="HighSchool">HighSchool</option>
        <option value="College">College</option></select><br/>
    Select your favorite time of day:<br/>
    <select size="3" name="TofD">
        <option value="Morning">Morning</option>
        <option value="Day">Day</option>
        <option value="Night">Night</option></select>
    <p><input type="submit" /></p>
</form>
<h2>JSON</h2>
<pre id="result">
</pre>

CSS

form {
    line-height: 2em;
}
p {
    margin: 5px 0;
}
h2 {
    margin: 10px 0;
    font-size: 1.2em;
    font-weight: bold
}
#result {
    margin: 10px;
    background: #eee;
    padding: 10px;
    height: 40px;
    overflow: auto;
}

JavaScript

// Use internal $.serializeArray to get list of form elements which is consistent with $.serialize
//
// And to avoid names such as 
// => object["favorite-color"]
//
// We camelcase the name part, so the notation becomes 
// => object["favoriteColor"]
//
// Conveniently, this allows period notation to be used.
// => object.favoriteColor
//
// This behaviour is similar to $(element).data()
//
// $('<div data-favorite-color="yellow"></div>').data()
// => { favoriteColor: 'yellow' }
$.fn.serializeObject = function() {
    var o = Object.create(null),
        elementMapper = function(element) {
            element.name = $.camelCase(element.name);
            return element;
        },
        appendToResult = function(i, element) {
            var node = o[element.name];

            if ('undefined' != typeof node && node !== null) {
                o[element.name] = node.push ? node.push(element.value) : [node, element.value];
            } else {
                o[element.name] = element.value;
            }
        };

    $.each($.map(this.serializeArray(), elementMapper), appendToResult);
    return o;
};

//
// TEST
//
$(function() {
    $('form').submit(function() {
        $('#result').text(JSON.stringify($('form').serializeObject()));
        return false;
    });
});