old_contents: var express = require('express');
  var fs = require('file-system');
  var router = express.Router();
  
  var TextToSpeechV1 = require('watson-developer-cloud/text-to-speech/v1');
  var SpeechToTextV1 = require('watson-developer-cloud/speech-to-text/v1');
  
  var text_to_speech = new TextToSpeechV1({
      username: '69bfd0da-dd82-416c-8043-901a66dda6b0',
      password: 'yT2ZMmqPKrDv',
      headers: {
      'X-Watson-Learning-Opt-Out': 'true'
      }
  });
  
  var speech_to_text = new SpeechToTextV1({
      username : "87f6b0a7-4d1c-4c27-ae4b-177463cfd33f",
      password : "iDzdOBlQ61v2" ,
  	headers: {
      'X-Watson-Learning-Opt-Out': 'true'
    }
  });
  
  router.get('/texttospeech', function(req, res, next) {
  	var params = {
    text: 'Welocme to node js',
    voice: 'en-US_AllisonVoice',
    accept: 'audio/wav'
  };
  // Pipe the synthesized text to a file.
  text_to_speech.synthesize(params).on('error', function(error) {
    console.log('Error:', error);
  }).pipe(fs.createWriteStream('./public/audio/audio1.wav'));
  	
  });
    
   
  router.get('/speechtotext', function(req, res, next) {
  	
      var params = {
      audio: fs.createReadStream('./public/audio/audio1.wav'),
      content_type: 'audio/wav',
      timestamps: true,
      word_alternatives_threshold: 0.9,
      continuous: true
    };
  // Pipe the synthesized text to a file.
   speech_to_text.recognize(params, function(error, transcript) {
      if (error)
        console.log('Error:', error);
      else
        res.send(transcript.results[0].alternatives[0].transcript);
        
    });
  	
  });
  
  
  /* GET home page. */
  router.get('/', function(req, res, next) {
    res.render('index', { title: 'Express' });
  });
  
  module.exports = router;
  
new_contents: var express = require('express');
  var fs = require('file-system');
  var router = express.Router();
  
  var TextToSpeechV1 = require('watson-developer-cloud/text-to-speech/v1');
  var SpeechToTextV1 = require('watson-developer-cloud/speech-to-text/v1');
  
  var text_to_speech = new TextToSpeechV1({
      username: '69bfd0da-dd82-416c-8043-901a66dda6b0',
      password: 'yT2ZMmqPKrDv',
      headers: {
      'X-Watson-Learning-Opt-Out': 'true'
      }
  });
  
  var speech_to_text = new SpeechToTextV1({
      username : "87f6b0a7-4d1c-4c27-ae4b-177463cfd33f",
      password : "iDzdOBlQ61v2" ,
  	headers: {
      'X-Watson-Learning-Opt-Out': 'true'
    }
  });
  
  router.get('/texttospeech', function(req, res, next) {
  	var params = {
    text: 'Welocme to node js',
    voice: 'en-US_AllisonVoice',
    accept: 'audio/wav'
  };
  // Pipe the synthesized text to a file.
  text_to_speech.synthesize(params).on('error', function(error) {
    console.log('Error:', error);
  }).pipe(fs.createWriteStream('audio1.wav'));
  	
  });
    
   
  router.get('/speechtotext', function(req, res, next) {
  	
      var params = {
      audio: fs.createReadStream('./public/audio/audio1.wav'),
      content_type: 'audio/wav',
      timestamps: true,
      word_alternatives_threshold: 0.9,
      continuous: true
    };
  // Pipe the synthesized text to a file.
   speech_to_text.recognize(params, function(error, transcript) {
      if (error)
        console.log('Error:', error);
      else
        res.send(transcript.results[0].alternatives[0].transcript);
        
    });
  	
  });
  
  
  /* GET home page. */
  router.get('/', function(req, res, next) {
    res.render('index', { title: 'Express' });
  });
  
  module.exports = router;
  
subject: Update index.js