Create a nested JSON object dynamically

var ei = {'settings': [3]};
ei.settings.push(4);
console.log(ei);
// This will output an object with property settings and value an array with values (3 and 4)

var editeditems = [];
...

$('#SaveChanges').click(function() {
    $('.portlet').each(function() {
        var settings = [];
        $('.settingInput').each(function() {
            settings.push({
                settingkey: $(this).attr('name'),
                settingvalue: $(this).attr('value')
            });
        });

        editeditems.push({
            itemname: $(this).data('itemname'),
            settings: settings
        });
    });

    ...
});

will generate sample output:

var editeditems = 
[
    {
        "itemname": "item1",
        "settings": [
            {
                "settingkey": "key1",
                "settingvalue": "value1"
            },
            {
                "settingkey": "key2",
                "settingvalue": "value2"
            }
        ]
    },
    {
        "itemname": "item2",
        "settings": [
            {
                "settingkey": "key1",
                "settingvalue": "value3"
            },
            {
                "settingkey": "key2",
                "settingvalue": "value4"
            }
        ]
    }
];