The error event of the Web Speech API SpeechRecognition object is fired when a speech recognition error occurs.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener('error', event => { })

onerror = event => { }

An SpeechRecognitionErrorEvent. Inherits from Event.

In addition to the properties listed below, properties from the parent interface, Event, are available.

SpeechRecognitionErrorEvent.error Read only

Returns the type of error raised.

SpeechRecognitionErrorEvent.message Read only

Returns a message describing the error in more detail.

You can use the error event in an addEventListener method:

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

recognition.addEventListener('error', function(event) {
  console.log('Speech recognition error detected: ' + event.error);
});

Or use the onerror event handler property:

recognition.onerror = function(event) {
  console.log('Speech recognition error detected: ' + event.error);
}

• Web Speech API