@google-cloud/speech

@google-cloud/speech

Google Cloud Speech Client Library for Node.js

This is a Beta release of Google Cloud Speech. This feature is not covered by any SLA or deprecation policy and may be subject to backward-incompatible changes.

Looking for more Google APIs than just Speech? You might want to check out google-cloud.

• API Documentation
• Official Documentation

$ npm install --save @google-cloud/speech

var speech = require('@google-cloud/speech')({
  projectId: 'grape-spaceship-123',
  keyFilename: '/path/to/keyfile.json'
});

// Detect the speech in an audio file.
speech.recognize('./audio.raw', {
  encoding: 'LINEAR16',
  sampleRate: 16000
}, function(err, transcript) {
  // transcript = 'how old is the Brooklyn Bridge'
});

// Detect the speech in an audio file stream.
fs.createReadStream('./audio.raw')
  .on('error', console.error)
  .pipe(speech.createRecognizeStream({
    config: {
      encoding: 'LINEAR16',
      sampleRate: 16000
    },
    singleUtterance: false,
    interimResults: false
  }))
  .on('error', console.error)
  .on('data', function(data) {
    // The first "data" event emitted might look like:
    //   data = {
    //     endpointerType: Speech.endpointerTypes.START_OF_SPEECH,
    //     ...
    //   }
    //
    // A later "data" event emitted might look like:
    //   data = {
    //     endpointerType: Speech.endpointerTypes.END_OF_AUDIO,
    //     ...
    //   }
    //
    // A final "data" event emitted might look like:
    //   data = {
    //     endpointerType: Speech.endpointerTypes.END_OF_AUDIO,
    //     results: "how old is the Brooklyn Bridge",
    //     ...
    //   }
  });

// Promises are also supported by omitting callbacks.
speech.recognize('./audio.raw', {
  encoding: 'LINEAR16',
  sampleRate: 16000
}).then(function(data) {
  var transcript = data[0];
});

// It's also possible to integrate with third-party Promise libraries.
var speech = require('@google-cloud/speech')({
  promise: require('bluebird')
});

Authentication

It's incredibly easy to get authenticated and start using Google's APIs. You can set your credentials on a global basis as well as on a per-API basis. See each individual API section below to see how you can auth on a per-API-basis. This is useful if you want to use different accounts for different Google Cloud services.

On Google Compute Engine

If you are running this client on Google Compute Engine, we handle authentication for you with no configuration. You just need to make sure that when you set up the GCE instance, you add the correct scopes for the APIs you want to access.

// Authenticating on a global basis.
var projectId = process.env.GCLOUD_PROJECT; // E.g. 'grape-spaceship-123'

var speech = require('@google-cloud/speech')({
  projectId: projectId
});

// ...you're good to go!

Elsewhere

If you are not running this client on Google Compute Engine, you need a Google Developers service account. To create a service account:

1. Visit the Google Developers Console.
2. Create a new project or click on an existing project.
3. Navigate to APIs & auth > APIs section and turn on the following APIs (you may need to enable billing in order to use these services):

• Google Cloud Speech API

1. Navigate to APIs & auth > Credentials and then:

• If you want to use a new service account key, click on Create credentials and select Service account key. After the account key is created, you will be prompted to download the JSON key file that the library uses to authenticate your requests.
• If you want to generate a new service account key for an existing service account, click on Generate new JSON key and download the JSON key file.

var projectId = process.env.GCLOUD_PROJECT; // E.g. 'grape-spaceship-123'

var speech = require('@google-cloud/speech')({
  projectId: projectId,

  // The path to your key file:
  keyFilename: '/path/to/keyfile.json'

  // Or the contents of the key file:
  credentials: require('./path/to/keyfile.json')
});

// ...you're good to go!