The active read-only property of the MediaStream interface returns a Boolean value which is true if the stream is currently active; otherwise, it returns false. A stream is considered active if at least one of its MediaStreamTracks is not in the MediaStreamTrack.ended state. Once every track has ended, the stream's active property becomes false.


var isActive =;


A Boolean value which is true if the stream is currently active; otherwise, the value is false.


In this example, a new stream whose source is the user's local camera and microphone is requested using getUserMedia(). When that stream becomes available (that is, when the returned Promise is fulfilled, a button on the page is updated based on whether or not the stream is currently active.

var promise = navigator.mediaDevices.getUserMedia({ 
  audio: true, 
  video: true 

promise.then(function(stream) {
  var startBtn = document.querySelector('#startBtn');
  startBtn.disabled =; 


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

Browser compatibility

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Feature Chrome Firefox (Gecko) Microsoft Edge Internet Explorer Opera Safari (WebKit)
Basic support (Yes) 52 (52) ? ? ? ?
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support (Yes) 52.0 (52) ? ? ? ? (Yes)

Document Tags and Contributors

 Contributors to this page: Sheppy, PushpitaPikuDey, jpmedley
 Last updated by: Sheppy,