Make JavaScript pages readable for AI crawlers
JavaScript rendering for AI crawlers is about one question: does a bot that reads only raw HTML get the same words a browser shows? Proofsource fetches your key pages both ways, flags pages that come back thin or blank to crawlers, and explains what is missing and how to fix it. Web teams get a clear list of the pages to make readable for ChatGPT, Claude and Perplexity.
| Page | Crawler view | Browser view | Crawlers get |
|---|---|---|---|
| / | 412 words | 430 words | 96% |
| /pricing | 0 words | 380 words | 0% |
| /features | 120 words | 520 words | 23% |
| /integrations | 0 words | 610 words | 0% |
| /compare/otter | 1,140 words | 1,160 words | 98% |
| /blog/ai-meeting-notes-guide | 2,310 words | 2,330 words | 99% |
JavaScript rendering for AI crawlers, in short
The facts, ready to quote.
- Compares
- The non-JavaScript crawler view of a page with the browser view, as words a crawler gets against words a browser renders
- Guidance
- What is missing for crawlers on each page and how to fix it
- Checks
- One page, a batch of pages, or a page's content on demand
- Re-check
- Run again after you ship server rendering or prerendering
JavaScript rendering for AI crawlers, explained
Modern sites often send the browser a nearly empty HTML file and build the page with JavaScript. Browsers run that code, so people see a full page. Many AI crawlers do not run it. They read the HTML the server returns and move on. If your product details, pricing or answers only appear after JavaScript runs, a crawler can receive a page with a header, a footer and almost nothing in between. An answer engine cannot cite words it never received.
The fix is to put the text in the first HTML response. Server-side rendering, static prerendering and hydration-friendly frameworks all do that. Where changing the site is slow, a common bridge is dynamic rendering at the edge: the CDN recognizes an AI crawler and serves it a fully rendered, clean version of the same page, while people keep the normal site. Either way, the test is the same: fetch the page without JavaScript, count the words, and compare with what a browser renders.
Proofsource runs that test on your key pages. It captures the crawler view and the browser view for each page, shows the word counts side by side, flags pages that are blank or thin to crawlers, and explains what is missing and how to fix it. Readability checks can run on one URL, a batch of URLs, or a page's content directly.
How it works
Compare what AI crawlers read on your pages with what a browser shows, fix pages that load only with JavaScript, and serve clean pages to AI crawlers.
Pick your key pages
Proofsource starts with the pages that matter for buyer questions, such as home, pricing, product and comparison pages, and you can add any URL.
Capture both views
Each page is fetched as a non-JavaScript crawler would read it and as a browser renders it, and both views are stored.
Compare the words
Word counts and content are compared per page, and pages that are blank or thin to crawlers are flagged.
Get fix guidance
Each flagged page says what crawlers are missing and how to fix it, from server rendering to robots rules.
Re-check after you ship
Run the capture again once server rendering or prerendering is live and compare against the stored before view.
See it in the product
Screens from the Proofsource app, drawn with sample data for an example brand.
- Serve the plan names and features in the first HTML response (server rendering or prerendering)
- Give the page one H1 that says what it is
- Keep plan details in text, not only inside images or tabs loaded later
- Re-run the check after the change ships
Every capability, live today
3 shipped capabilities behind JavaScript rendering for AI crawlers, each in the product now.
What AI crawlers see
Fetches each key page as a person and as an AI crawler, stores both views, and compares the words so blank or thin pages stand out.
Bot view fix guidance
Explains what is missing for crawlers on a page and how to fix it.
Bot readability checks
Check how readable a page is to bots for one URL, a batch of URLs, or a page's content directly, and keep the results so you can compare before and after a fix.
Who it is for
Find the pages your framework hides
See which routes ship an empty HTML shell and prioritize server rendering where buyers' questions land.
Explain why a strong page is never cited
If a page reads well in a browser but crawlers get 0 words, that is why AI answers cite someone else.
Make the case for server rendering
Show the empty HTML shell and the word counts per route to justify the engineering time.
Show the client the blank page
Put the crawler view next to the browser view in a client review. The gap explains itself.
Why it matters
See the page a bot sees
Word counts per page make an invisible problem obvious in seconds.
Fix the right pages first
Blank and thin pages are flagged, so effort goes to the pages that matter for buyer questions.
Clear instructions
Each flagged page says what is missing and how to fix it, written for the people who will change it.
Proof the fix worked
Re-run the capture after shipping and compare against the stored before view.
Google AI OverviewsGoogle AI Mode
JavaScript rendering for AI crawlers: Proofsource and other tools
Several tools look at how AI crawlers read JavaScript pages, and some serve rendered pages to them. This table lists what each one's public pages describe.
| Capability | Proofsource | Profound | Scrunch | Otterly.AI | SE Ranking |
|---|---|---|---|---|---|
| Crawler view compared with browser view | YesWords a crawler gets against words a browser renders, per key page | RelatedFix AI-unreadable content: opens up content AI crawlers cannot readSource | RelatedSite audit flags access controls, JavaScript rendering issues, content gapsSource | RelatedFree GEO tools include crawler simulationSource | RelatedSite audit with JS renderingSource |
| Fix guidance per page | YesWhat crawlers are missing on each page and how to fix it | Not listed | YesDetects AI bot crawl failures, with fixesSource | RelatedGEO audit: structured data and AI-readiness review with fixesSource | Not listed |
| Rendered pages served to AI crawlers | SoonEarly access: an edge option for Cloudflare sites that serves clean pages to AI crawlers | YesDynamic Bot Rendering serves fully rendered pages to AI bots on CloudFront, Cloudflare or VercelSource | YesAgent Experience Platform serves AI agents a machine-readable version of pagesSource | Not listed | Not listed |
| Check one page or a batch | YesCheck how readable pages are to bots: one URL, a batch, or pasted content. | Not listed | Yes5, 10 or custom page audits per planSource | YesChecks AI bot access; works on competitor sites tooSource | Not listed |
| Compare before and after a fix | YesBot readability results are stored, so you can compare before and after a fix. | Not listed | Not listed | Not listed | Not listed |
Where each of them shines
Profound's Dynamic Bot Rendering covers CloudFront, Cloudflare and Vercel, a wide reach for serving rendered pages to AI bots. Compare in full
Scrunch's Agent Experience Platform serves AI agents a machine-readable version of pages while leaving the human design unchanged. Compare in full
Otterly.AI offers free GEO tools, including a crawler simulation anyone can try. Compare in full
SE Ranking's site audit covers more than 115 metrics with JavaScript rendering and scheduled audits.
Questions about JavaScript rendering for AI crawlers
Can AI crawlers read JavaScript websites?
Many cannot. Several AI crawlers read only the raw HTML a server returns and do not run JavaScript, so a client-rendered page can look almost empty to them. Server-side rendering or prerendering puts the text in the HTML where every crawler can read it.
How do I see what GPTBot sees on my page?
Fetch the page without running JavaScript and look at the text that comes back. Proofsource does this for your key pages and shows the crawler's word count next to the browser's, with the gap as a percentage.
Does this matter for ChatGPT, Claude, Perplexity and Google AI Overviews?
Yes. ChatGPT, Claude and Perplexity rely on crawlers and fetchers that read your pages, and many of them read raw HTML. Google renders JavaScript for Search, but pages that put text in the first response are still read faster and more reliably.
What should I fix first?
Pages that come back blank to crawlers and that answer buyer questions, such as pricing, product, integration and comparison pages. Proofsource flags those and says what is missing on each.
What is dynamic rendering for AI crawlers?
It means the CDN recognizes an AI crawler and serves it a fully rendered version of the page, while people get the normal site. It is a bridge while a site moves to server rendering, and the content must be the same for both.
Does Proofsource serve rendered pages to AI crawlers?
Not today. Proofsource shows what AI crawlers receive and tells you how to fix each page at the source. For sites on Cloudflare, an edge option that serves clean pages to AI crawlers is in early access: ask us to join and we turn it on for your workspace.
Can I check many pages at once?
Yes. Readability checks run on one URL, on a batch of URLs, or on a page's content directly.
How is this different from Profound's Dynamic Bot Rendering or Scrunch's AXP?
Both are strong ways to serve AI bots a rendered or machine-readable version of pages, across several CDNs. Proofsource starts with the measurement: a captured crawler view and browser view per page, guidance for fixing at the source, and a before and after record, and an edge option for Cloudflare sites is in early access.
Keep exploring
Try it on your own brand.
Proofsource is live: scan your brand and see JavaScript rendering for AI crawlers at work with your own answers, competitors and sources.
Google AI OverviewsGoogle AI Mode