generate_json.rb

require 'json'

obj = {
  foo: 'bar',
  hoge: [
         'fuga',
         {
           one: 1,
           two: 2
         }
        ]
}                                                                                                                                                                                                                        print JSON.pretty_generate(obj)

# > PRECISE64 niku% ruby generate_json.rb
# > {
# >   "foo": "bar",
# >   "hoge": [
# >     "fuga",
# >     {
# >       "one": 1,
# >       "two": 2
# >     }
# >   ]
# > }