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

The SpeechGrammar interface of the Web Speech API represents a set of 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 SpeechGrammar object.


Sets and returns a string containing the grammar from within in the SpeechGrammar object instance.
SpeechGrammar.weight Optional
Sets and returns the weight of the SpeechGrammar object.


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;

console.log(speechRecognitionList[0].src); // should return the same as the contents of the grammar variable
console.log(speechRecognitionList[0].weight); // should return 1 - the same as the weight set in line 4.


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support25 webkit No441 2 No27 No
SpeechGrammar() constructor25 webkit No441 2 No27 No
src25 No441 2 No27 No
weight25 No441 2 No27 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No64 webkit No No No No No
SpeechGrammar() constructor No64 webkit No No No No No
src No64 No No No No No
weight No64 No No No No No

1. Note that currently only the speech synthesis part is available in Firefox Desktop — the speech recognition part will be available soon, once the required internal permissions are sorted out.

2. From version 44: this feature is behind the media.webspeech.recognition.enable preference (needs to be set to true). To change preferences in Firefox, visit about:config.

See also

Étiquettes et contributeurs liés au document

Contributeurs à cette page : fscholz, chrisdavidmills
Dernière mise à jour par : fscholz,