For quickly visualizing JSON content on the web, this French website http://json.parser.online.fr is excellent.
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But I’ve since begun to favor this Atom-based plugin, Pretty JSON, which works within Atom. (Atom has plugins for everything, probably even watching your dog and doing your laundry).
Just press Shift+Cmd+J (or your keybinding of choice) and JSON turns into formatted data within Atom:
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