JavaScript Checker

Check whether JavaScript is enabled and which JavaScript features your browser supports.

JavaScript Status Checking...

Testing JavaScript execution in your browser.

Checking

JavaScript is disabled

Your browser is not allowing JavaScript to run on this page. Enable JavaScript in your browser settings, then reload the page.

JavaScript Test Basic JavaScript functionality detected in your current browser.

JavaScript —

Script Execution —

DOM Manipulation —

Secure Context —

Browser Online —

Page Protocol —

Modern JavaScript Features Common JavaScript technologies supported by your browser.

Promises —

Async / Await —

Fetch API —

ES Modules —

JSON —

WebAssembly —

Browser JavaScript APIs Useful APIs available to JavaScript on this device.

Web Workers —

Service Workers —

Clipboard API —

Geolocation API —

Notifications API —

Fullscreen API —

Browser Storage Storage technologies JavaScript can use in this browser.

Cookies —

Local Storage —

Session Storage —

IndexedDB —

Cache API —

Cookie Store API —

Current Environment Basic browser information useful when troubleshooting JavaScript problems.

Browser Language —

Platform —

CPU Threads —

Device Memory —

Timezone —

Viewport —

JavaScript enabled, but a website still isn't working?

JavaScript may be enabled while a browser extension, Content Security Policy, ad blocker, privacy setting, corrupted cache, or blocked external script prevents part of a website from running correctly.

This checker runs locally in your browser. It does not need an external API or access to your personal files.