JSONView has been one of the first things I ensure is installed in Chrome for years now. It adds interactivity and highlighting whenever you navigate to a JSON resource.
I wanted the same for JS, CSS et al and Sight fit the bill for that. Both extensions add CSS to JSON resources and they were initially conflicting. It turns out that
you can edit the CSS styling for JSONView (and the themes of Sight). By doing so I was able to get them to play nicely with one another.