JavaScript SEO: Making React and Next.js Sites Rank
How Google actually renders JavaScript, where it breaks, and how to structure modern frameworks so content gets indexed.
Technical SEO
How Google processes JavaScript
Googlebot crawls the HTML, queues the page for rendering, then renders it with a headless browser when resources allow. That render can happen seconds or days after the initial crawl. Anything only visible after JavaScript execution is indexed on a delay, if at all.
Where it commonly breaks
Content loaded on user interaction is never seen. Client-side routing without proper history handling produces uncrawlable URLs. Meta tags set by JavaScript may not be read. Infinite scroll without paginated fallbacks hides most of your content.
The reliable approaches
Server-side rendering or static generation removes the problem entirely, which is why Next.js and Nuxt exist. Where full SSR is impractical, prerendering for bots is acceptable provided the content matches what users see.
Verify with the URL Inspection tool's rendered HTML rather than assuming. What you see in view-source is not what Google indexes.
Key takeaways
- Rendering happens after crawling and can be significantly delayed
- SSR or static generation eliminates most JavaScript SEO problems
- Always verify with rendered HTML in the URL Inspection tool
- Content requiring interaction to appear will not be indexed
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