SEO people love to talk in acronyms and vague advice. That's not helpful when your problem is technical. Let's talk about what's actually happening under the hood.

How search engines work (the 30-second version)

Search engines do three things: crawl, render, and index. For plain HTML sites, these happen almost instantly. For JavaScript sites, step 2 is the problem.

The rendering gap

When a crawler visits a React, Vue, or Angular app, it gets an HTML shell with a JavaScript bundle. To see the actual content, it needs to execute that JavaScript. This is expensive. Google has a dedicated rendering queue for this — and it's always backed up.

"We do render pages with JavaScript, but it can take some time before we're able to render them." — Google Search Central

"Some time" can mean days. During that window, your page is indexed but with no content — which means no rankings.

What Google actually sees right now

Test it yourself with curl from your terminal:

curl -A "Googlebot/2.1" https://yoursite.com

If the output is an empty <div id="root"></div>, you have a problem.

The LLM crawler problem is worse

AI search engines like ChatGPT, Perplexity, and Claude crawl the web to build their knowledge bases. Most of these crawlers don't execute JavaScript at all. If your site is JavaScript-rendered, you're invisible to the AI era of search.

Quick test: Ask ChatGPT about your company or product. If it doesn't know anything accurate, your JavaScript SEO is likely the culprit.

The three solutions, ranked by effort

1. Prerendering (lowest effort) — intercepts crawler requests and serves pre-rendered HTML. Your app doesn't change at all.

2. Server-Side Rendering (medium effort) — render on a server for every request. Requires framework changes.

3. Static Site Generation (situational) — build static HTML at deploy time. Only works for non-dynamic content.

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