Test Website Without JavaScript

Check if your website requires JavaScript and how JS impacts performance.

Want a fast site that passes Google's Core Web Vitals? Try DebugBear monitoring.

➔ Start Free Trial

Compare how your website looks with and without JavaScript

Does your website require JavaScript to render?

Check whether your website renders correctly when JavaScript isn't available.

See what page content depends on JavaScript

Compare what content only displays after JavaScript has run and what content does not depend on JS.

Screenshot of a test result showing a website with and without JavaScript

JavaScript impacts page speed

Content that depends on JavaScript loads more slowly

If your page content requires JavaScript to render, visitors will spend more time waiting and you'll get worse Largest Contentful Paint scores.

JS increases page weight

JavaScript code bundles need to be downloaded and once the code is run they often trigger additional requests on the page.

Does your website use client-side rendering?

Single-page JavaScript apps often don't show content without JS

Unless your single-page app also supports server-side rendering, visitors won't be able to see content until after JavaScript code has loaded and run.

Page crawlers may not see your content

While Google does run JavaScript when crawling pages, other search engines and social media crawlers don't.

Website that doesn't render fully without JS

Monitor JavaScript Performance Impact

Track how JS affects your Core Web Vitals and page load times.

➔ Start Free Trial