What Google Actually Sees on Your JavaScript Site (And Why It Might Surprise You)

You spent months building your React app. The design is polished, the content is solid, and your pages load fast in the browser. But here's the thing — what you see in Chrome is not necessarily what Google sees when it crawls your site. If your site relies on JavaScript to render content, there's a gap between the user experience and the search engine experience. Sometimes it's small. Sometimes your entire page content is invisible to Google. And in 2026, the problem just got worse — because AI crawlers like ChatGPT and Perplexity can't render JavaScript at all. This post explains what's actually happening under the hood, how to check if your site is affected, and what to do about it. How Google processes JavaScript sites When Googlebot visits a URL, it doesn't work like your browser. It processes pages in two phases. First, it fetches the raw HTML — the source code before any JavaScript runs. At this point, it extracts links and basic content from whatever is in that initial HTML resp