Ruby script to GET JSON then convert it to XML.

get_json_then_convert_it_to_xml.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'

  gem 'activesupport'
  gem 'builder'
  gem 'faraday'
  gem 'faraday_middleware'
end

require 'active_support/core_ext/array/conversions'
require 'active_support/core_ext/hash/conversions'
require 'faraday'
require 'faraday_middleware/response_middleware'
require 'json'

class JsonToXmlFaradayResponseMiddleware < FaradayMiddleware::ResponseMiddleware
  define_parser do |body, options|
    options ||= {}
    options = { dasherize: false }.merge(options)
    object = ::JSON.parse(body)
    object.to_xml(options)
  end
  
  # @note Overriding.
  def parse_response?(env)
    env.response.headers['Content-Type']&.include?('application/json')
  end
end

connection = Faraday.new do |connection|
  connection.use(JsonToXmlFaradayResponseMiddleware)
end

url = STDIN.read.chomp
puts connection.get(url).body