Covert form data to JSON string

<form name = 'test' >
    <input type='text' name = 'login'>
    <input type='email' name = 'email'>
</form>

If I use JSON.serialize($(form)).serializeArray();
I get [{"name":"login","value":"a value"},{"name":"email","value":"a email"}] while I need {"login":"a login","email":"a email"}. How to do that??