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

The onnomatch property of the SpeechRecognition interface represents an event handler that will run when the speech recognition service returns a final result with no significant recognition (when the nomatch event fires.)

This may involve some degree of recognition, which doesn't meet or exceed the confidence threshold.

Note: The onnomatch handler does not yet work properly in Firefox — the speech recognition system always returns a positive match, and then guesses at what item in the grammar it found. This is being worked on.


mySpeechRecognition.onnomatch = function() { ... };


var recognition = new SpeechRecognition();

recognition.onnomatch = function() {
  console.log('Speech not recognized');


Web Speech API
# dom-speechrecognition-onnomatch

Browser compatibility

BCD tables only load in the browser

See also