# GPTBot Doesn't Run JavaScript — What Your Site Looks Like To It GPTBot, ClaudeBot, PerplexityBot, and CCBot don't execute JavaScript. They read your raw server HTML and move on. If your content only exists in the JS-rendered DOM, they see an empty shell. The audit catches thin raw HTML, render-blocking scripts, head-heavy CSS, and missing title/meta in the server response. Author: J.A. Watte Published: May 1, 2026 Source: https://jwatte.com/blog/blog-tool-render-block-audit/ --- Googlebot renders JavaScript. AI crawlers mostly don't. GPTBot (OpenAI), ClaudeBot (Anthropic), PerplexityBot, and CCBot (Common Crawl) fetch your raw HTML, parse it as a string, and move on. If you're running a client-side React or Vue app without server-side rendering, your raw HTML is a 1-2 KB shell that says "loading…" — and that's all the AI crawler sees. The [Render-Block Audit](/tools/render-block-audit/) fetches your URL's raw HTML and scores it for what a non-JS crawler would actually extract. ## What it checks - **Word count in raw ``.** Under 200 = critical (SPA shell only). 200-500 = thin. 500+ = healthy. - **H1 in raw HTML.** Missing = crawlers have no title anchor. Multiple = pick one canonical. - **JS framework fingerprint.** React / Next / Nuxt / Vue / Angular / Svelte / Gatsby / Remix / Astro signatures in the head + SPA containers (`#__next`, `#app`, `[data-reactroot]`). - **Render-blocking `