jqtree.rb

  #!/usr/bin/env ruby
# display tree of json key names
# like tree(1) for JSON
# by @tlehman

require 'json'

input = STDIN.read || File.open(ARGV.first).read

parsed_input = JSON.parse(input)

def puts_keys(hash, indent_level = 0)
  # and all hash key children
  indent = "  " * indent_level
  hash.keys.each do |key|
    puts indent + key
    if hash[key].is_a?(Hash)
      puts_keys(hash[key], indent_level + 1)
    end
  end
end

puts_keys(parsed_input)