Print content of JavaScript object?

This will give you very nice output with an indented JSON object using JSON.stringify:

alert(JSON.stringify(YOUR_OBJECT_HERE, null, 4));

The second argument (replacer) alters the contents of the string before returning it.

The third argument (space) specifies how many spaces to use as white space for readability.

JSON.stringify documentation here.

If you are using Firefox, alert(object.toSource()) should suffice for simple debugging purposes.