The MediaDevices method enumerateDevices() requests a list of the available media input and output devices, such as microphones, cameras, headsets, and so forth. The returned Promise is resolved with a MediaDeviceInfo array describing the devices.


var enumeratorPromise = navigator.mediaDevices.enumerateDevices();

Return value

A Promise that receives an array of MediaDeviceInfo objects when the promise is fulfilled. Each object in the array describes one of the available media input and output devices. The order is significant - the default capture devices will be listed first.

If enumeration fails, the promise is rejected.


Here's an example of using enumerateDevices(). It outputs a list of the device IDs, with their labels if available.

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( + ": " + err.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=


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

Browser compatibility

BCD tables only load in the browser

See also