/Web APIs


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.

Instance properties

MediaDeviceInfo.deviceId Read only

Returns a string 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.groupId Read only

Returns a string 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.kind Read only

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

MediaDeviceInfo.label Read only

Returns a string describing this device (for example "External USB Webcam").

Note: For security reasons, the label field is always blank unless an active media stream exists or the user has granted persistent permission for media device access. The set of device labels could otherwise be used as part of a fingerprinting mechanism to identify a user.

Instance methods


Returns a JSON representation of the MediaDeviceInfo object.


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

if (!navigator.mediaDevices || !navigator.mediaDevices.enumerateDevices) {
  console.log("enumerateDevices() not supported.");
} else {
  // List cameras and microphones.
    .then((devices) => {
      devices.forEach((device) => {
        console.log(`${device.kind}: ${device.label} id = ${device.deviceId}`);
    .catch((err) => {
      console.log(`${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=


Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
MediaDeviceInfo 47 14 39 No 34 11 47 47 39 34 11 5.0
deviceId 47 14 39 No 34 11 47 47 39 34 11 5.0
groupId 47 14
39Before Firefox 67, related devices are not actually grouped together by groupId.
No 34 11 47 47
39Before Firefox 67, related devices are not actually grouped together by groupId.
34 11 5.0
kind 47 14 39 No 34 11 47 47 39 34 11 5.0
label 47 14 39 No 34 11 47 47 39 34 11 5.0
toJSON 47 18 42 No 34 11 47 47 42 34 11 5.0

See also

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