The MediaDevicesInfo 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.


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").

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.




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

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

// List cameras and microphones.

.then(function(devices) {
  devices.forEach(function(device) {
    console.log(device.kind + ": " + device.label +
                " id = " + device.deviceId);
.catch(function(err) {
  console.log( + ": " + error.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=


Specification Status Comment
Media Capture and Streams
The definition of 'MediaDevicesInfo' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 55.0[1] (Yes) 39 No support ?[2] No support
Feature Android Android Webview Edge Firefox Mobile (Gecko) Firefox OS (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support No support ? (Yes) 39 2.5 No support ?[2] No support ?

[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

Document Tags and Contributors

 Contributors to this page: Sheppy, chrisdavidmills, libbymc, jpmedley, rolfedh, Sebastianz
 Last updated by: Sheppy,