gistfile1.js

var readCurrencies = function(callback) {
  var filepath = __dirname + '/../models/currencies.txt';
  
  var handleFileData = function handleFileData(err, data) {
    if (err) {
      return callback(err);
    }
    callback(null, convertToJson(data));
  };
  
  fs.readFile(filepath, {encoding: 'utf-8'}, handleFileData);
  
});