MediaDeviceInfo

The MediaDevicesInfo interface contains information on the available media input and output devices.

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 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"). Only available during active MediaStream use or when persistent permissions have been granted.

Methods

None.

Example

Here's an example of using mediaDevices.enumerateDevices().

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 + ": " + error.message);
});

This might produce:

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

or if one or more MediaStreams are active or persistent permissions are 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

[1] For earlier versions, this interface is available through the adapter.js polyfill.

[2] This interface is available in Opera through the adapter.js polyfill.

See also

• WebRTC - the introductory page to the API