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Google Cloud Speech API: Node.js Client

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The Cloud Speech API enables easy integration of Google speech recognition technologies into developer applications. Send audio and receive a text transcription from the Cloud Speech API service.

Using the client library

  1. Select or create a Cloud Platform project.

  2. Enable billing for your project.

  3. Enable the Google Cloud Speech API API.

  4. Set up authentication with a service account so you can access the API from your local workstation.

  5. Install the client library:

     npm install --save @google-cloud/speech
  6. Try an example:

// Imports the Google Cloud client library
const speech = require('@google-cloud/speech');
const fs = require('fs');

// Creates a client
const client = new speech.SpeechClient();

// The name of the audio file to transcribe
const fileName = './resources/audio.raw';

// Reads a local audio file and converts it to base64
const file = fs.readFileSync(fileName);
const audioBytes = file.toString('base64');

// The audio file's encoding, sample rate in hertz, and BCP-47 language code
const audio = {
  content: audioBytes,
const config = {
  encoding: 'LINEAR16',
  sampleRateHertz: 16000,
  languageCode: 'en-US',
const request = {
  audio: audio,
  config: config,

// Detects speech in the audio file
  .then(data => {
    const response = data[0];
    const transcription = response.results
      .map(result => result.alternatives[0].transcript)
    console.log(`Transcription: ${transcription}`);
  .catch(err => {
    console.error('ERROR:', err);


Samples are in the samples/ directory. The samples' README.md has instructions for running the samples.

Sample Source Code Try it
Speech Recognition source code Open in Cloud Shell
Speech Recognition v1p1beta1 source code Open in Cloud Shell

The Speech API Node.js Client API Reference documentation also contains samples.


This library follows Semantic Versioning.

This library is considered to be General Availability (GA). This means it is stable; the code surface will not change in backwards-incompatible ways unless absolutely necessary (e.g. because of critical security issues) or with an extensive deprecation period. Issues and requests against GA libraries are addressed with the highest priority.

More Information: Google Cloud Platform Launch Stages


Contributions welcome! See the Contributing Guide.


Apache Version 2.0


What's Next

Read more about the client libraries for Cloud APIs, including the older Google APIs Client Libraries, in Client Libraries Explained.