Fix Facebook's unicode issues (in the downloaded archive of your data)

json-fb-unicode.rb

#!/usr/bin/env ruby

require 'json'

file = File.open(ARGV[0])

bytes_re = /((?:\\\\)+|[^\\])(?:\\u[0-9a-f]{4})+/

content = file.read.gsub(bytes_re) do |bad_unicode|
  $1 + eval(%Q{"#{bad_unicode[$1.size..-1].gsub('\u00', '\x')}"}).to_json[1...-1]
end

json = JSON.parse(content)

content = JSON.pretty_generate(json)

File.open("output.json", 'w') { |file| file.write content }