The getSupportedConstraints() method of the MediaDevices interface returns an object based on the MediaTrackSupportedConstraints dictionary, whose member fields each specify one of the constrainable properties the user agent understands.


var supportedConstraints = navigator.mediaDevices.getSupportedConstraints();



Return value

A new object based on the MediaTrackSupportedConstraints dictionary listing the constraints supported by the user agent. Because only constraints supported by the user agent are included in the list, each of these Boolean properties has the value true.


This example outputs a list of the constraints supported by your browser.

let constraintList = document.getElementById("constraintList");
let supportedConstraints = navigator.mediaDevices.getSupportedConstraints();

for (let constraint in supportedConstraints) {
  if (supportedConstraints.hasOwnProperty(constraint)) {
    let elem = document.createElement("li");
    elem.innerHTML = "<code>" + constraint + "</code>";



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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Microsoft Edge Opera Safari
Basic support (Yes) 50 (50) ? ? ? ?
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? 48.0 (48) 50.0 (50) ? ? ? (Yes)

Document Tags and Contributors

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