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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.
Candidate Recommendation Initial definition.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Microsoft Edge Opera Safari
Basic support 53 44 (44) ? ? 40 11
Feature Android Webview Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 53 52 50.0 (50) ? 40 11

Document Tags and Contributors

Contributors to this page: Sheppy, e53e04ac, jpmedley, octavn
Last updated by: Sheppy,