In Firebug, you can
see JSON formatted as an expandable tree of items and also explore them using Firebug's Dom tab. The view is available within Net panel and visible as soon as a JSON request is expanded.
As in this screenshot:
I'm trying to switch to Chrome but can't find this feature in Dev Tools.
Does Chrome's Dev Tools provide something similar (assuming you're not using any additional extensions like Firebug Lite)?