Extract transaction ID from IBM Watson Node.js SDK Speech to Text RecognizeStream (WebSocket)

stt-ws-transaction-id.js

'use strict';

const SpeechToTextV1 = require('watson-developer-cloud/speech-to-text/v1');
require('dotenv').config({silent: true}); // optional, loads credentials from a .env file
const fs = require('fs');

const speech_to_text = new SpeechToTextV1({
  // defaults to env properties if these are unset
  // username: 'INSERT YOUR USERNAME FOR THE SERVICE HERE',
  // password: 'INSERT YOUR PASSWORD FOR THE SERVICE HERE'
});

// create the stream
const recognizeStream = speech_to_text.createRecognizeStream({
  content_type: 'audio/wav'
});

// pipe in some audio
fs.createReadStream(__dirname + '/resources/speech.wav').pipe(recognizeStream);

// notes:
//   1. Requires watson-developer-cloud@2.24.0 or later
//   2. It won't resolve until after you begin sending audio
//   3. This won't work in browsers because WebSocket headers are not exposed in browsers
recognizeStream.getTransactionId()
  .then( transId => {
    console.log('transaction id', transId);
  }).catch( err => {
    console.log('error getting transaction id', err);
  });