This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The error read-only property of the SpeechRecognitionError interface returns the type of error raised.

This SpeechRecognitionError interface was renamed to SpeechRecognitionErrorEvent in the Web Speech API specification.


var myError = event.error;


A DOMString naming the type of error. The possible error types are:

No speech was detected.
Speech input was aborted in some manner, perhaps by some user-agent-specific behavior like a button the user can press to cancel speech input.
Audio capture failed.
Network communication required for completing the recognition failed.
The user agent disallowed any speech input from occurring for reasons of security, privacy or user preference.
The user agent disallowed the requested speech recognition service, either because the user agent doesn't support it or because of reasons of security, privacy or user preference. In this case it would allow another more suitable speech recognition service to be used instead.
There was an error in the speech recognition grammar or semantic tags, or the chosen grammar format or semantic tag format was unsupported.
The language was not supported.


var recognition = new SpeechRecognition();

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

Browser compatibility

No compatibility data found. Please contribute data for "api.SpeechRecognitionError.error" (depth: 1) to the MDN compatibility data repository.

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