tfl_api.rb

require "open-uri"
require "json"

ENDPOINT = "https://api.tfl.gov.uk/line/mode/tube,overground,dlr,tflrail/status"

json_data = open(ENDPOINT).read
JSON.parse(json_data).each do |line|
  name = line["name"]
  status = line["lineStatuses"].first["statusSeverityDescription"]
  puts "#{status} on the #{name}"
  unless line["lineStatuses"].first["reason"].nil?
    reason = line["lineStatuses"].first["reason"]
    puts "The reason is:"
    puts "#{reason}"
    puts ""
  end
end