csv2json.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'fastercsv'
require 'json'

class Cvs2json
  attr_reader :csv
  def initialize(filename)
    @filename = filename
    @csv = FasterCSV.read(@filename, {:converters => :all} )
  end
  
  def tojson
    json_file = File.basename(@filename, '.csv')
    File.open("#{json_file}.js", 'w') do |f|
      f.puts(@csv.to_json)
    end
  end
end

b = Cvs2json.new(ARGV[0])
b.tojson