JavaScript SEO
Making JavaScript-built pages expose their real content and links to search bots, not just to a browser after scripts run.
See it
What it is
JavaScript SEO is the work of making sure a search crawler can fetch, render, understand, and index content produced by JavaScript. Googlebot renders with an evergreen Chromium, so modern syntax is rarely the problem. Rendering happens after the initial crawl, though, and it can fail when scripts, APIs, or resources are blocked. The reliable baseline is useful HTML before hydration, then JavaScript as an enhancement.
Reach for it when a React, Vue, or other client-rendered site looks complete in a browser but key copy or links are absent from View Source. Check the raw response and the rendered DOM separately. Main content, canonicals, robots directives, structured data, and real <a href> links should survive rendering and should not depend on a click or scroll.
The gotcha is treating every indexing problem as a rendering problem. A perfectly rendered page can still be duplicate, thin, noindexed, or poorly linked. Server-side rendering improves reliability, but it does not make weak content indexable by decree.
Ask AI for it
Audit this JavaScript site for search rendering failures. Compare the raw HTML response with the rendered DOM in Google Search Console URL Inspection, then fix any missing primary copy, <title>, canonical, robots meta tag, JSON-LD, or internal <a href> links. Render essential content on the server or at build time, keep it present after hydration, return meaningful HTTP status codes, and remove any user interaction required to load indexable content. Verify the finished page with JavaScript both enabled and blocked.