Use of JSON::State to output more human readable JSON

pretty_json.rb

require 'json'

hash = { 'a' => 1, 'b' => 2 }
state = JSON::State.new(indent: '  ',
                        space: ' ',
                        space_before: '',
                        object_nl: "\n",
                        array_nl: "\n")

hash.to_json # => "{\"a\":1,\"b\":2}"
hash.to_json(state) # => "{\n  \"a\": 1,\n  \"b\": 2\n}"