JavaScript SEO.
Learn what JavaScript SEO means in modern search and SEO.
The practice of ensuring content rendered or managed by JavaScript is accessible and indexable by search engine crawlers.
JavaScript SEO addresses the challenges created by modern JavaScript-heavy web development for search engine crawling and indexing. When content is rendered client-side by JavaScript frameworks (React, Vue, Angular), crawlers must execute the JavaScript to see the content—a slower, resource-intensive process that happens in a separate rendering queue with potential indexing delays of days to weeks.
JavaScript Rendering and Indexing
Googlebot uses a two-wave crawling system for JavaScript: first it crawls the raw HTML and places JavaScript pages in a rendering queue; later (sometimes much later), it renders the JavaScript and processes the dynamic content. This delay can cause indexing issues for critical pages. The solution is server-side rendering (SSR) or static site generation (SSG), which deliver fully rendered HTML to crawlers without requiring JavaScript execution—eliminating the delay entirely.
Testing JavaScript SEO
Use Google Search Console's URL Inspection tool to compare the crawled and rendered version of pages—differences between raw HTML and rendered HTML reveal JavaScript-dependent content that may not be reliably indexed. Google's Mobile-Friendly Test and Lighthouse also provide rendered HTML views. Screaming Frog supports JavaScript rendering to compare crawl outputs.
Articles about JavaScript SEO
Read more on the Aergos blog.
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The Most Common SEO Mistakes We See on New Client Sites
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