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

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support YesEdge Full support 12Firefox Full support 52IE ? Opera ? Safari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 52Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes


Full support  
Full support
Compatibility unknown  
Compatibility unknown

Document Tags and Contributors

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