index.js

var request = require('request');
var streamBuffers = require("stream-buffers");
/**
 * Escape special characters in the given string of html.
 *
 * @param  {String} languageLocale = the target locale language (example : en)
 * @param  {String} word = the word to translate to speech
 * @param  {function({'audio' : String, 'message' : String })} callback = function invoked on translate completed with two 
 * arguments : audio data as base64 and success true for translated ok and false otherwise
 */
module.exports = {
  translate: function(languageLocale, word, callback) {
      var url = "http://translate.google.com/translate_tts?tl=" + languageLocale + "&q=" + word;
      
      var myWritableStreamBuffer = new streamBuffers.WritableStreamBuffer({
          initialSize: (100 * 1024),      // start as 100 kilobytes.
          incrementAmount: (10 * 1024)    // grow by 10 kilobytes each time buffer overflows.
      });

      var r = request(url, function (error, response, buffer) {
        if (!error && response.statusCode == 200) {
            var data = myWritableStreamBuffer.getContents().toString('base64');
            var result = {'audio' : data, 'success' : true };
            callback(result);
         } else {
           var result = {'success' : false, 'error' : error, 'responseCode' : response.statusCode };
           callback(result);
         }
      }).pipe(myWritableStreamBuffer);
  }
};