A QuickLook plugin to pretty-print (node.js style) JSON.
To install a pre-built version for osx 10.6+,
download and unzip
QuickJSON.qlgenerator.zip
into /Library/QuickLook/
(to install system-globally),
or into ~/Library/QuickLook/
(to install for yourself only).
You may need to create this directory, if it does not exist.
To get sweet copy/paste functionality while in QuickLook, also run
defaults write com.apple.finder QLEnableTextSelection -bool true
from a Terminal window.