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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.

The MediaDevices interface provides access to connected media input devices like cameras and microphones, as well as screensharing.




With the user's permission through a prompt, turns on a camera or screensharing and/or a microphone on the system and provides a MediaStream containing a video track and/or an audio track with the input.
Obtains an array of information about the media input and output devices available on the system.


'use strict';

// Put variables in global scope to make them available to the browser console.
var video = document.querySelector('video');
var constraints = window.constraints = {
  audio: false,
  video: true
var errorElement = document.querySelector('#errorMsg');

.then(function(stream) {
  var videoTracks = stream.getVideoTracks();
  console.log('Got stream with constraints:', constraints);
  console.log('Using video device: ' + videoTracks[0].label);
  stream.onended = function() {
    console.log('Stream ended');
  }; = stream; // make variable available to browser console
  video.srcObject = stream;
.catch(function(error) {
  if ( === 'ConstraintNotSatisfiedError') {
    errorMsg('The resolution ' + + 'x' + + ' px is not supported by your device.');
  } else if ( === 'PermissionDeniedError') {
    errorMsg('Permissions have not been granted to use your camera and ' +
      'microphone, you need to allow the page access to your devices in ' +
      'order for the demo to work.');
  errorMsg('getUserMedia error: ' +, error);

function errorMsg(msg, error) {
  errorElement.innerHTML += '<p>' + msg + '</p>';
  if (typeof error !== 'undefined') {


Specification Status Comment
Media Capture and Streams
The definition of 'MediaDevices' in that specification.
Editor's Draft Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support Not supported 36.0 (36.0) Not supported Not supported Not supported
enumerateDevices() 45.0[1]        
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support Not supported Not supported 36.0 (36.0) 36.0 (36.0) Not supported Not supported Not supported Not supported
enumerateDevices() Not supported Not supported           Not supported

[1] Behind a flag.

See also

Étiquettes et contributeurs liés au document

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