A quick oneliner you can add to your .bash_profile to pretty print the contents of your clipboard.

pretty_print_json.sh

# Takes the contents of the clipboard, replaces apostrophes (') with quotation marks (") and replaces titlecased bools (True/False) with JSON acceptable lowercase, then pretty prints
function pjson() {
    pbpaste | sed "s/'/\"/g" | sed "s/True/true/g" |  sed "s/False/false/g" | json_pp
}