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This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The SpeechGrammarList interface of the Web Speech API represents a list of SpeechGrammar objects containing words or patterns of words that we want the recognition service to recognize.

Grammar is defined using JSpeech Grammar Format (JSGF.) Other formats may also be supported in the future.


Creates a new SpeechGrammarList object.


SpeechGrammarList.length Read only
Returns the number of SpeechGrammar objects contained in the SpeechGrammarList.


Standard getter — allows individual SpeechGrammar objects to be retrieved from the SpeechGrammarList using array syntax.
Takes a grammar present at a specific URI and adds it to the SpeechGrammarList as a new SpeechGrammar object.
Takes a grammar present in a specific DOMString within the code base (e.g. stored in a variable) and adds it to the SpeechGrammarList as a new SpeechGrammar object.


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

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;


Specification Status Comment
Web Speech API
The definition of 'SpeechGrammarList' in that specification.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support33 webkit 1 ? No No No No
SpeechGrammarList() constructor33 webkit 1 ? No No No No
addFromString33 webkit 1 ? No No No No
addFromURI33 webkit 1 ? No No No No
item33 webkit ? No No No No
length33 webkit 1 ? No No No No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ? Yes webkit 1 ? No No No ?
SpeechGrammarList() constructor Yes webkit 1 Yes1 ? No No No ?
addFromString Yes webkit 1 Yes webkit 1 ? No No No ?
addFromURI Yes webkit 1 Yes webkit 1 ? No No No ?
item Yes webkit 1 Yes webkit ? No No No ?
length Yes webkit 1 Yes webkit 1 ? No No No ?

1. You'll need to serve your code through a web server for recognition to work.

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

Étiquettes et contributeurs liés au document

Contributeurs à cette page : ExE-Boss, chrisdavidmills
Dernière mise à jour par : ExE-Boss,