dump jquery object in an alert box

I am not quite adept in maneuvering jQuery, and it came to a point that I need to debug a program that was passed down from me without a documentation.

I have this var a, an object, that I really want to know the content of its collection. In my mind I need a function like foreach() in PHP to iterate over this object variable. Upon researching I end up in using jQuery.each(). Now I can clearly iterate and see what was inside var a.

However, it was kind of annoying to alert once every value on the var a. What I wanna know if it's possible to display all the contents in just one pop of alert box?

Here is my code:

$.each(a, function(index, value) { 
alert(index + ': ' + value); 
});

The var a contains infos such as:

creationdate: date_here
id: SWFUpload
modificationdate: date_here
type: .jpg
index: 0
name: uploaded_filename.jpg
size: size_in_bytes

BTW: The var a is called via file upload script.