JSON syntax for property names

Question

What is the correct syntax to create objects in javascript that will work across the majority of web browsers (by that I mean : IE 6+, Firefox 2+, Opera 9+ )

Is this

Answer 1

You have to use "quotes" around properties that contain anything other than word characters

{foo-bar: 3} // invalid
{"foo-bar": 3} // valid

Other than that there is no difference between the two and I'd imagine both ways work across all browsers