Dump Twitter followers to JSON or CSV

json2csv.rb

# Usage:
#   ruby -rubygems json2csv.rb my-dump.json > people.csv
# 
require 'json'; require 'csv'
FIELDS = %w(id screen_name name friends_count followers_count)
data = JSON.load ARGF
csv = CSV::Writer.create(STDOUT)
data.each { |user| csv << FIELDS.map { |f| user[f] } }

twitter-followers-json.rb

## Dump followers for twitter user to JSON string
# 
# Usage:
#   ruby -rubygems twitter-followers-json.rb mislav > followers-mislav.json
#
require 'open-uri'; require 'json'
users, cur = [], -1
url = "http://twitter.com/statuses/followers/#{ARGV[0]}.json?cursor=%d"

until cur.zero?
  data = JSON.load(open(url % cur))
  users.concat data['users']
  cur = data['next_cursor'].to_i
end
puts JSON.dump(users)