Grab a list of all the foursquare venues

grab_venues.rb

# ruby grab_venues.rb will print a csv of all the foursquare venue types
# flattens the nested hash of venues

url = "https://api.foursquare.com/v2/venues/categories?oauth_token=your_token&v=20120828"

require 'json'

# hashes are nested, containing arrays of hashes of category information
def print_hash(hash)
  # We've found a category
  if hash['id'] and hash['name']
    puts "#{hash['id']},#{hash['name']}"
  end
  # We've found an array of hashes of categories (that might contain more arrays!)
  if hash["categories"]
    hash["categories"].each do |h|
      print_hash(h)
    end
  end
end

ret = `curl #{url}`
json_response = JSON.parse(ret)

puts json_response["response"]["categories"].first

json_response["response"]["categories"].each do |c|
  print_hash(c)
end