Convert CSV to JSON

csv_to_json.rb

require 'json'
require 'csv'

# Transforms CSV into JSON and saves it next to the CSV.
# Paths to CSV accepted as an input argument

csv_in = ARGV[0]
ARGV.clear
while true
  break if !csv_in.nil? && File.exist?(csv_in)

  puts 'Give me path to CSV'
  csv_in = gets.chomp
end

puts "Starting"
raw_csv = CSV.read(csv_in, encoding: 'UTF-8')
header = raw_csv.shift.collect(&:to_sym)
json_data = raw_csv.map { |a| Hash[header.zip(a)] }

File.open(json_out.gsub('.csv', '.json'), 'w') do |f|
  f.write(JSON.pretty_generate(json_data))
end