Web/API/Window/isSecureContext

The window.isSecureContext read-only property indicates whether a context is capable of using features that require secure contexts.

Syntax

var isSecure = window.isSecureContext

Examples

Feature detection

You can use feature detection to check whether they are in a secure context or not by using the isSecureContext boolean which is exposed on the global scope.

if (window.isSecureContext) {
  // Page is a secure context so service workers are now available
  navigator.serviceWorker.register("/offline-worker.js").then(function () {
    ...
  });
}

Specifications

Specification	Status	Comment
Secure Contexts	Candidate Recommendation	Initial definition.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`isSecureContext`	Chrome Full support 47	Edge Full support 15	Firefox Full support 49	IE No support No	Opera Full support 34	Safari Full support 11.1	WebView Android Full support 47	Chrome Android Full support 47	Firefox Android Full support 49	Opera Android Full support 34	Safari iOS Full support 11.3	Samsung Internet Android Full support 5.0
Considers `window.opener` Experimental'	Chrome No support No	Edge No support No	Firefox Full support 49	IE No support No	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android No support No	Firefox Android Full support 49	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.