How to Check If Google and AI Bots Are Actually Seeing the Same Page
Googlebot renders JavaScript. GPTBot, ClaudeBot and PerplexityBot don't. Here's exactly how to check what each one really receives.
They usually aren't seeing the same thing. Googlebot renders your JavaScript in a headless browser before indexing. GPTBot, ClaudeBot and PerplexityBot fetch the raw HTTP response and read it as-is, no JavaScript execution at all. A page can sit at position one on Google and be functionally empty to every AI crawler at the same time.
- View source (not DevTools' rendered Elements panel) shows you roughly what a non-JS crawler sees.
- Disabling JavaScript and reloading the page is the fastest manual test.
- Curling the page with a crawler's real user-agent and grepping for your key content is more reliable than either.
- Server logs tell you which bots are actually visiting, separate from what they can read once they arrive.
- A dedicated access-check tool does all of this in one pass instead of four separate steps.
Why don't Google and AI crawlers see the same thing?
Googlebot has run a full rendering pipeline for years now, a real browser engine that executes your JavaScript, waits for API calls to resolve, and indexes the final DOM. OpenAI's own crawler documentation confirms GPTBot does not do any of that: it sends an HTTP GET, downloads whatever HTML comes back in that single response, and moves on. No mounting, no hydration, no waiting. ClaudeBot and PerplexityBot work the same way.
That means anything injected client-side (content loaded after the initial page load, text rendered by a JavaScript framework, product details pulled in via a client-side API call) is invisible to these crawlers even though it renders perfectly for a human visitor and for Google.
How do I actually check this myself?
1. View source, not DevTools. Right-click → View Page Source (not Inspect Element) shows you the raw HTML the server sent, before any JavaScript ran. If your key content isn't in that raw text, no non-rendering crawler will see it either.
2. Disable JavaScript and reload. Most browsers let you toggle this in DevTools' settings. Whatever disappears is exactly what GPTBot, ClaudeBot and PerplexityBot never got in the first place.
3. Curl it with the real user-agent. curl -A "GPTBot" https://yoursite.com/page and search the output for your actual content. This is the closest simulation of what the crawler itself receives, since it's the same request method.
4. Check your server logs. This tells you a different thing: not what a crawler can read, but whether it's actually visiting at all. A page can be perfectly readable and still never get crawled if it's blocked in robots.txt or buried too deep in your site structure to be discovered.
None of these crawlers wait for your JavaScript. They read whatever arrives in the first response and nothing else.
What's the fastest way to check across a whole site?
Doing the four checks above manually, per page, per crawler, doesn't scale past a handful of URLs. A free LLM Access Check runs the actual fetch as Googlebot, GPTBot, ClaudeBot and PerplexityBot in one pass, shows you element by element what each one received, and flags exactly where the gap is, whether it's a JavaScript rendering issue, a robots.txt block, or something else entirely. If your site also serves different code to mobile and desktop, that's a related, separate risk worth checking too. For a full picture across your whole site, a full AEO & GEO audit scores this alongside everything else that affects whether a page gets cited.
What do I do once I've found a gap?
If your content is genuinely JavaScript-rendered, the fix is server-side rendering or prerendering, at minimum for the content that matters for citation (the actual answer, the key facts, the structured data). You don't need to abandon a client-rendered framework entirely, you need the crawlable version of the page to contain the substance, even if the interactive layer loads on top of it for human visitors.
| Check method | Shows you | Effort |
|---|---|---|
| View source | Raw HTML before JS runs | Seconds |
| Disable JS + reload | What visually disappears | Seconds |
| Curl with crawler UA | Exactly what the crawler receives | A few minutes |
| Server logs | Whether the crawler visits at all | Ongoing |
| Dedicated access-check tool | All of the above, per crawler, at once | Seconds |
FAQ
Does Googlebot really render JavaScript while AI crawlers don't?
Yes. Googlebot has used a full rendering pipeline for years. GPTBot, ClaudeBot and PerplexityBot fetch the raw HTTP response only and do not execute JavaScript at all.
If my site ranks well on Google, does that mean AI crawlers can read it too?
No. Ranking well only tells you Googlebot can read it. A separate check against the non-rendering crawlers is the only way to know if they can too.
Is server-side rendering the only fix?
It's the most reliable one. Prerendering just the crawlable version of the page works too, as long as the actual content and structured data are present in that first HTML response.