Why AI Crawlers Can't See Your React App

Google has been rendering JavaScript since 2019. It's not perfect, but it works. So if you're building with React, Vue, or Next.js, you might assume search engines can see your content just fine. That assumption is about to cost you traffic. Because Google isn't the only crawler that matters anymore. AI-powered search engines are growing fast — ChatGPT, Perplexity, Google's AI Overviews, Microsoft Copilot. They're changing how people find information online. And almost none of their crawlers render JavaScript. How AI Crawlers Actually Work When GPTBot (OpenAI's crawler), PerplexityBot, or ClaudeBot visit your site, they don't fire up a headless browser. They don't execute your JavaScript. They don't wait for your React components to mount or your API calls to resolve. They send a simple HTTP request, download whatever HTML your server returns, and move on. If your server returns a fully rendered page with all your content in the HTML, great — the AI crawler sees everything. If your ser