AWS parsing

test.js

;(function() {
  'use strict';

  var http = require('https');

  var map = {
    "ap-northeast-1": "Tokyo, JP",
    "ap-southeast-1": "SG",
    "ap-southeast-2": "Sydney, AU",
    "eu-central-1": "Frankfurt, DE",
    "eu-west-1": "IE",
    "sa-east-1": "Sao Paulo, BR",
    "us-east-1": "VA, US",
    "us-west-1": "CA, US",
    "us-west-2": "OR, UA"
  };

  http.get('https://ip-ranges.amazonaws.com/ip-ranges.json', function(res) {
    var chunk = '';
    res.on('data', function(data) {
      chunk += data;
    });

    res.on('end', function() {
      chunk = chunk.toString();
      var records = JSON.parse(chunk),
          csv = '';
      [].concat(records.prefixes).forEach(function(prefix, key) {
        var region = '"' + (map[prefix.region] || '') + '"',
            mash = [prefix.ip_prefix, region];
        csv += mash.toString() + "\n";
      });
      console.log(csv);
    });
  }).on('error', function(e) {
        console.log(e.message);
      });
})();