Ruby script to split GeoJSON file(s) into separate files, one for each feature.

split_geojson.rb

require 'json'
require 'fileutils'

ARGV.select{ |file| [".json", ".geojson"].include? File.extname(file) }.each do |file|
  basename = File.basename(file, File.extname(file))
  geojson = JSON.parse(File.open(file).read)
  if geojson.has_key? "features"
    
    # Create directory if not exists:
    unless Dir.exists?(basename)
      Dir.mkdir(basename)
    end
    
    geojson["features"].each_with_index { |feature, index|    
      single_geojson = {
        "type" => "FeatureCollection",
        "features" => [feature]
      }
      
      single_file = "#{basename}/#{basename}_#{index}.geojson"
      puts "Writing file #{index + 1}/#{geojson["features"].length}: #{single_file}"
      
      File.open(single_file, 'w') { |file| file.write(JSON.pretty_generate(single_geojson)) }      
    }
  end
end