SpeechRecognition: start event


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

The start event of the Web Speech API SpeechRecognition object is fired when the speech recognition service has begun listening to incoming audio with intent to recognize grammars associated with the current SpeechRecognition.

Bubbles No
Cancelable No
Interface Event
Event handler property onstart


You can use the start event in an addEventListener method:

var recognition = new webkitSpeechRecognition() || new SpeechRecognition();

recognition.addEventListener('start', function() {
  console.log('Speech recognition service has started');

Or use the onstart event handler property:

recognition.onstart = function() {
  console.log('Speech recognition service has started');


Specification Status Comment
Web Speech API
The definition of 'speech recognition events' in that specification.

Browser compatibility

BCD tables only load in the browser

See also