Free, with no signup and no card.

JavaScript SEO Analyzer

See what search engines and AI crawlers get from your page before any JavaScript runs. We read the raw HTML your server sends and check it for your title, headings, text, links, and schema. Content that only shows up after JavaScript runs is often missed by AI crawlers and is risky for search.

What Google and AI see before JavaScript runs

When someone opens your site, their browser first gets the HTML your server sends. Then JavaScript can add more text, buttons or links. People see the finished page. Many bots don’t.

Google reads it in two steps

Google can run JavaScript, but it does it in a second step that can take longer. Google explains this in its JavaScript SEO basics guide. If your main text only shows up after JavaScript runs, Google may take longer to understand the page.

Many AI crawlers don’t run JavaScript

Many of the bots that AI tools send out read only the server HTML. If your content is added by JavaScript, the page can look almost empty to them, and they’re less likely to quote you.

How to read your result

  • Server-rendered: your title, headings and text are already in the HTML. Good.
  • Mostly client-rendered: a big part of your content arrives through JavaScript. Worth a closer look.
  • Empty shell: the HTML has almost no text. Bots that don’t run JavaScript see next to nothing.

What you can do

  • Ask your developer to send your main text in the server HTML (server-side rendering or static pages).
  • Use normal links with an href for your menu, not only buttons that change the page with JavaScript.
  • Put your title, description and structured data in the HTML instead of adding them later.

More free tools