TheenumerateDevices() method of theMediaDevices interface requests a list of the currently available media input and output devices, such as microphones, cameras, headsets, and so forth.The returnedPromise is resolved with an array ofMediaDeviceInfo objects describing the devices.

The returned list will omit any devices that are blocked by the documentPermission Policy:microphone,camera,speaker-selection (for output devices), and so on.Access to particular non-default devices is also gated by thePermissions API, and the list will omit devices for which the user has not granted explicit permission.

Syntax

enumerateDevices()

Parameters

None.

Return value

APromise that is fulfilled with an array ofMediaDeviceInfo objects.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.

Other than default devices, only devices for which permission has been granted are "available".

If the media device is an input device, anInputDeviceInfo object will be returned instead.

If enumeration fails, the promise is rejected.

Security requirements

Access to the API is subject to the following constraints:

• The method must be called in asecure context.
• The document must be fully active and its visibility must be "visible".

Examples

Here's an example of usingenumerateDevices(). It outputs a list of thedevice IDs, with their labels if available.

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

This might produce:

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

or if one or moreMediaStreams are active or persistent permissions aregranted:

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

• MediaDevices.getUserMedia
• WebRTC - the introductory page to the API
• Media Capture and Streams API - the API for the media stream objects
• Taking webcam photos - atutorial on usinggetUserMedia() for taking photos rather than video.