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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder/error_event below:

MediaRecorder: error event - Web APIs

Limited availability

The error event of the MediaRecorder interface is fired when an error occurs: for example because recording wasn't allowed or was attempted using an unsupported codec.

This event is not cancelable and does not bubble.

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

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

onerror = (event) => { }

A MediaRecorderErrorEvent. Inherits from Event.

Inherits properties from its parent interface, Event.

error Read only

A DOMException containing information about the error that occurred.

A function to be called whenever an error occurs during the recorder's lifetime. In addition to other general errors that might occur, the following errors are specifically possible when using the MediaStream Recording API; to determine which occurred, check the value of MediaRecorderErrorEvent.error.name.

SecurityError

The MediaStream is configured to disallow recording. This may be the case, for example, with sources obtained using getUserMedia() when the user denies permission to use an input device.

InvalidModificationError

The number of tracks on the stream being recorded has changed. You can't add or remove tracks while recording media.

UnknownError

An non-security related error occurred that cannot otherwise be categorized. Recording stops, the MediaRecorder's state becomes inactive, one last dataavailable event is sent to the MediaRecorder with the remaining received data, and finally a stop event is sent.

Using addEventListener() to listen for error events:

async function record() {
  const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
  const recorder = new MediaRecorder(stream);
  recorder.addEventListener("error", (event) => {
    console.error(`error recording stream: ${event.error.name}`);
  });
  recorder.start();
}

record();

The same, but using the onerror event handler property:

async function record() {
  const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
  const recorder = new MediaRecorder(stream);
  recorder.onerror = (event) => {
    console.error(`error recording stream: ${event.error.name}`);
  };
  recorder.start();
}

record();

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