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The SpeechRecognition interface of the Web Speech API is the controller interface for the recognition service; this also handles the SpeechRecognitionEvent sent from the recognition service.


Creates a new SpeechRecognition object.


SpeechRecognition also inherits properties from its parent interface, EventTarget.

Returns and sets a collection of SpeechGrammar objects that represent the grammars that will be understood by the current SpeechRecognition.
Returns and sets the language of the current SpeechRecognition. If not specified, this defaults to the HTML lang attribute value, or the user agent's language setting if that isn't set either.
Controls whether continuous results are returned for each recognition, or only a single result. Defaults to single (false.)
Controls whether interim results should be returned (true) or not (false.) Interim results are results that are not yet final (e.g. the SpeechRecognitionResult.isFinal property is false.)
Sets the maximum number of SpeechRecognitionAlternatives provided per result. The default value is 1.
Specifies the location of the speech recognition service used by the current SpeechRecognition to handle the actual recognition. The default is the user agent's default speech service.

Event handlers

Fired when the user agent has started to capture audio.
Fired when the user agent has finished capturing audio.
Fired when the speech recognition service has disconnected.
Fired when a speech recognition error occurs.
Fired when the speech recognition service returns a final result with no significant recognition. This may involve some degree of recognition, which doesn't meet or exceed the confidence threshold.
Fired when the speech recognition service returns a result — a word or phrase has been positively recognized and this has been communicated back to the app.
Fired when any sound — recognisable speech or not — has been detected.
Fired when any sound — recognisable speech or not — has stopped being detected.
Fired when sound that is recognised by the speech recognition service as speech has been detected.
Fired when speech recognised by the speech recognition service has stopped being detected.
Fired when the speech recognition service has begun listening to incoming audio with intent to recognize grammars associated with the current SpeechRecognition.


SpeechRecognition also inherits methods from its parent interface, EventTarget.

Stops the speech recognition service from listening to incoming audio, and doesn't attempt to return a SpeechRecognitionResult.
Starts the speech recognition service listening to incoming audio with intent to recognize grammars associated with the current SpeechRecognition.
Stops the speech recognition service from listening to incoming audio, and attempts to return a SpeechRecognitionResult using the audio captured so far.


In our simple Speech color changer example, we create a new SpeechRecognition object instance using the SpeechRecognition() constructor, create a new SpeechGrammarList, and set it to be the grammar that will be recognised by the SpeechRecognition instance using the SpeechRecognition.grammars property.

After some other values have been defined, we then set it so that the recognition service starts when a click event occurs (see SpeechRecognition.start().) When a result has been successfully recognised, the SpeechRecognition.onresult handler fires,  we extract the color that was spoken from the event object, and then set the background color of the <html> element to that colour.

var grammar = '#JSGF V1.0; grammar colors; public <color> = aqua | azure | beige | bisque | black | blue | brown | chocolate | coral | crimson | cyan | fuchsia | ghostwhite | gold | goldenrod | gray | green | indigo | ivory | khaki | lavender | lime | linen | magenta | maroon | moccasin | navy | olive | orange | orchid | peru | pink | plum | purple | red | salmon | sienna | silver | snow | tan | teal | thistle | tomato | turquoise | violet | white | yellow ;'
var recognition = new SpeechRecognition();
var speechRecognitionList = new SpeechGrammarList();
speechRecognitionList.addFromString(grammar, 1);
recognition.grammars = speechRecognitionList;
//recognition.continuous = false;
recognition.lang = 'en-US';
recognition.interimResults = false;
recognition.maxAlternatives = 1;

var diagnostic = document.querySelector('.output');
var bg = document.querySelector('html');

document.body.onclick = function() {
  console.log('Ready to receive a color command.');

recognition.onresult = function(event) {
  var color = event.results[0][0].transcript;
  diagnostic.textContent = 'Result received: ' + color;
  bg.style.backgroundColor = color;


Specification Status Comment
Web Speech API
SpeechRecognition の定義

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 33 [1] 44 (44) [2] 未サポート 未サポート 未サポート
continuous 33 [1] 未サポート 未サポート 未サポート 未サポート
Feature Android Chrome Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
Basic support ? (有)[1] ? 2.5 未サポート 未サポート 未サポート
continuous ? (有)[1] ? 未サポート 未サポート 未サポート 未サポート
  • [1] Speech recognition interfaces are currently prefixed in Chrome, so you'll need to prefix interface names appropriately, e.g. webkitSpeechRecognition; You'll also need to serve your code through a web server for recognition to work.
  • [2] Can be enabled via the media.webspeech.recognition.enable flag in about:config, although note that currently speech recognition won't work on Desktop Firefox — it will be properly exposed soon, once the required internal permissions are sorted out.

Firefox OS permissions

To use speech recognition in an app, you need to specify the following permissions in your manifest:

"permissions": {
  "audio-capture" : {
    "description" : "Audio capture"
  "speech-recognition" : {
    "description" : "Speech recognition"

You also need a privileged app, so you need to include this as well:

  "type": "privileged"

See also


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