Cognitive Services Speech SDK for JavaScript

Overview

To simplify the development of speech-enabled applications, Microsoft provides the Speech SDK for use with the Speech service. The Speech SDK provides consistent native Speech-to-Text and Speech Translation APIs.

Install the npm module

Install the Cognitive Services Speech SDK npm module

npm install microsoft-cognitiveservices-speech-sdk

Example

The following code snippets illustrates how to do simple speech recognition from a file:

// Pull in the required packages.
var sdk = require("microsoft-cognitiveservices-speech-sdk");
var fs = require("fs");

// Replace with your own subscription key, service region (e.g., "westus"), and
// the name of the file you want to run through the speech recognizer.
var subscriptionKey = "YourSubscriptionKey";
var serviceRegion = "YourServiceRegion"; // e.g., "westus"
var filename = "YourAudioFile.wav"; // 16000 Hz, Mono

// Create the push stream we need for the speech sdk.
var pushStream = sdk.AudioInputStream.createPushStream();

// Open the file and push it to the push stream.
fs.createReadStream(filename).on('data', function(arrayBuffer) {
  pushStream.write(arrayBuffer.buffer);
}).on('end', function() {
  pushStream.close();
});

// We are done with the setup
console.log("Now recognizing from: " + filename);

// Create the audio-config pointing to our stream and
// the speech config specifying the language.
var audioConfig = sdk.AudioConfig.fromStreamInput(pushStream);
var speechConfig = sdk.SpeechConfig.fromSubscription(subscriptionKey, serviceRegion);

// Setting the recognition language to English.
speechConfig.speechRecognitionLanguage = "en-US";

// Create the speech recognizer.
var recognizer = new sdk.SpeechRecognizer(speechConfig, audioConfig);

// Start the recognizer and wait for a result.
recognizer.recognizeOnceAsync(
  function (result) {
    console.log(result);

    recognizer.close();
    recognizer = undefined;
  },
  function (err) {
    console.trace("err - " + err);

    recognizer.close();
    recognizer = undefined;
  });

The previous example uses single-shot recognition, which recognizes a single utterance. You can also use continuous recognition to control when to stop recognizing. Check out our step-by-step quickstart for many more options.

Samples

• Step-by-step quickstart for JavaScript.
• Step-by-step quickstart for the browser.
• More samples can be found in our Speech SDK sample repository.