MediaDevices

BaselineWidely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2017.

* Some parts of this feature may have varying levels of support.

Secure context: This feature is available only insecure contexts (HTTPS), in some or allsupporting browsers.

TheMediaDevices interface of theMedia Capture and Streams API provides access to connected media input devices like cameras and microphones, as well as screen sharing. In essence, it lets you obtain access to any hardware source of media data.

Instance properties

Inherits properties from its parent interface,EventTarget.

Instance methods

Inherits methods from its parent interface,EventTarget.

enumerateDevices(): Obtains an array of information about the media input and output devices available on the system.
getSupportedConstraints(): Returns an object conforming toMediaTrackSupportedConstraints indicating which constrainable properties are supported on theMediaStreamTrack interface. SeeMedia Streams API to learn more about constraints and how to use them.
getDisplayMedia(): Prompts the user to select a display or portion of a display (such as a window) to capture as aMediaStream for sharing or recording purposes. Returns a promise that resolves to aMediaStream.
getUserMedia(): With the user's permission through a prompt, turns on a camera and/or a microphone on the system and provides aMediaStream containing a video track and/or an audio track with the input.
selectAudioOutput()Experimental: Prompts the user to select a specific audio output device.

Events

devicechange: Fired when a media input or output device is attached to or removed from the user's computer.

Example

// Put variables in global scope to make them available to the browser console.const video = document.querySelector("video");const constraints = {  audio: false,  video: true,};navigator.mediaDevices  .getUserMedia(constraints)  .then((stream) => {    const videoTracks = stream.getVideoTracks();    console.log("Got stream with constraints:", constraints);    console.log(`Using video device: ${videoTracks[0].label}`);    stream.onremovetrack = () => {      console.log("Stream ended");    };    video.srcObject = stream;  })  .catch((error) => {    if (error.name === "OverconstrainedError") {      console.error(        `The resolution ${constraints.video.width.exact}x${constraints.video.height.exact} px is not supported by your device.`,      );    } else if (error.name === "NotAllowedError") {      console.error(        "You need to grant this page permission to access your camera and microphone.",      );    } else {      console.error(`getUserMedia error: ${error.name}`, error);    }  });