Node.js client for Google Cloud Speech: Speech to text conversion powered by machine learning.

License: Apache-2.0

Language: JavaScript

Keywords: machine-learning, nodejs, speech, speech-to-text

Google Cloud Platform logo

Cloud Speech: Node.js Client

release level npm version codecov

Cloud Speech Client Library for Node.js

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

Table of contents:


Before you begin

  1. Select or create a Cloud Platform project.
  2. Enable the Cloud Speech API.
  3. Set up authentication with a service account so you can access the API from your local workstation.

Installing the client library

npm install @google-cloud/speech

Using the client library

async function main() {
  // 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
  const [response] = await client.recognize(request);
  const transcription = response.results
    .map(result => result.alternatives[0].transcript)
  console.log(`Transcription: ${transcription}`);


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

Sample Source Code Try it
Microphone Stream source code Open in Cloud Shell
Beta Features source code Open in Cloud Shell
Infinite Streaming source code Open in Cloud Shell
Quickstart source code Open in Cloud Shell
Recognize source code Open in Cloud Shell
Recognize.v1p1beta1 source code Open in Cloud Shell

The Cloud Speech 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


Project Statistics

Sourcerank 15
Repository Size 9.18 MB
Stars 360
Forks 160
Watchers 39
Open issues 16
Dependencies 29
Contributors 46
Tags 46
Last updated
Last pushed

Top Contributors See all

renovate[bot] Justin Beckwith Yoshi Automation Bot Jason Dobry Jonathan Lui Alexander Fenster Stephen DPE bot Benjamin E. Coe Dave Gramlich greenkeeper[bot] Jun Mukai Christopher Wilcox Luke Sneeringer Ace Nassri Renovate Bot Shahin Gus Class Daniel Ruf Rebecca Taylor

Packages Referencing this Repo

Cloud Speech Client Library for Node.js
Latest release 3.2.6 - Updated - 360 stars

Recent Tags See all

v3.2.6 August 27, 2019
v3.2.5 August 02, 2019
v3.2.4 July 29, 2019
v3.2.3 July 23, 2019
v3.2.2 June 26, 2019
v3.2.1 June 14, 2019
v3.2.0 June 06, 2019
v3.1.1 May 29, 2019
v3.1.0 May 24, 2019
v3.0.0 May 20, 2019
v2.3.1 March 21, 2019
v2.3.0 February 04, 2019
v2.2.0 January 14, 2019
v2.1.2 January 08, 2019
v2.1.1 October 02, 2018

Something wrong with this page? Make a suggestion

Last synced: 2019-08-27 21:09:44 UTC

Login to resync this repository