converting multi array object to json string in javascript/jquery [duplicate]

I am trying to convert this object to json string but the result is not returning the object for address.

here's the code

{
        name: $('[name="name"]').val(),
        age: $('[name="age"]').val(),
        sex: $('[name="sex"]').val(),
        birthday: $('[name="birthday"]').val(),
        about: $('[name="about"]').val(),
        addresses: mapAlfredObject(getAlfredObject('addresses')),
        contacts: mapAlfredObject(getAlfredObject('contacts')),
    };

here's how I implemented the mapAlfredObject method

function mapAlfredObject(obj) {
    var items = [];
    for (var index in obj) {
        items[obj[index]['name']] = {
            value: obj[index]['value'],
            type: obj[index]['type'],
            comment: obj[index]['comment']
        };
    }
    return items;
}

here's the log from console

and the output from JSON.stringify

{"name":"","age":"","sex":"","birthday":"any","about":"","addresses":[],"contacts":[]}