MediaDeviceInfo

The MediaDeviceInfo interface contains information that describes a single media input or output device. The list of devices obtained by calling navigator.mediaDevices.enumerateDevices() is an array of MediaDeviceInfo objects, one per media device.

Properties

MediaDeviceInfo.deviceIdRead only

Returns a DOMString that is an identifier for the represented device that is persisted across sessions. It is un-guessable by other applications and unique to the origin of the calling application. It is reset when the user clears cookies (for Private Browsing, a different identifier is used that is not persisted across sessions).

MediaDeviceInfo.groupIdRead only

Returns a DOMString that is a group identifier. Two devices have the same group identifier if they belong to the same physical device — for example a monitor with both a built-in camera and a microphone.

MediaDeviceInfo.kindRead only

Returns an enumerated value that is either "videoinput", "audioinput" or "audiooutput".

MediaDeviceInfo.labelRead only

Returns a DOMString that is a label describing this device (for example "External USB Webcam").

Methods

None.

Example

Here's an example that uses enumerateDevices() to get a list of devices.

if (!navigator.mediaDevices || !navigator.mediaDevices.enumerateDevices) {
  console.log("enumerateDevices() not supported.");
  return;
}

// List cameras and microphones.

navigator.mediaDevices.enumerateDevices()
.then(function(devices) {
  devices.forEach(function(device) {
    console.log(device.kind + ": " + device.label +
                " id = " + device.deviceId);
  });
})
.catch(function(err) {
  console.log(err.name + ": " + err.message);
});

This might produce:

videoinput: id = csO9c0YpAf274OuCPUA53CNE0YHlIr2yXCi+SqfBZZ8=
audioinput: id = RKxXByjnabbADGQNNZqLVLdmXlS0YkETYCIbg+XxnvM=
audioinput: id = r2/xw1xUPIyZunfV1lGrKOma5wTOvCkWfZ368XCndm0=

or if one or more media streams are active, or if persistent permissions have been granted:

videoinput: FaceTime HD Camera (Built-in) id=csO9c0YpAf274OuCPUA53CNE0YHlIr2yXCi+SqfBZZ8=
audioinput: default (Built-in Microphone) id=RKxXByjnabbADGQNNZqLVLdmXlS0YkETYCIbg+XxnvM=
audioinput: Built-in Microphone id=r2/xw1xUPIyZunfV1lGrKOma5wTOvCkWfZ368XCndm0=

Specifications

Browser compatibility

See also

• WebRTC API
• navigator.mediaDevices.enumerateDevices()
• navigator.mediaDevices.getUserMedia()