JavaScript Rendering Checker

Find out what search engines and AI crawlers see before JavaScript runs. We check the raw HTML for content, links, headings and meta tags, spot empty app shells, detect the framework and measure script weight.

How to use the JavaScript Rendering Checker

  1. 1

    Enter the URL of a page built with JavaScript (or any page you want to test).

  2. 2

    Click Check rendering to read the HTML a crawler gets before scripts run.

  3. 3

    Follow the next steps to move important content, links and tags into the server HTML.

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Frequently asked questions

Can Google index JavaScript content?

Yes, but in a second, delayed rendering step that needs crawlable scripts. Bing renders less reliably, and most AI crawlers only read the raw HTML.

What is an empty app shell?

A page whose HTML is mostly an empty container like <div id="root"></div>. All content is added later by JavaScript, so crawlers that do not render see a blank page.

How do I fix client-side rendering for SEO?

Use server-side rendering or static generation (Next.js, Nuxt, Angular SSR, SvelteKit, Astro), and keep titles, canonicals and links in the server HTML.

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