Renderability
Renderability is the ability of search engine crawlers to execute JavaScript and render a page's content as it would appear to a user in a browser.
Google uses a two-phase indexing process: first it crawls the raw HTML, then it queues the page for rendering (executing JavaScript). The rendering queue can take seconds to weeks, meaning JavaScript-only content may not be indexed immediately.
This is why server-side rendering (SSR) and static site generation (SSG) are critical for SEO. Content present in the initial HTML is indexed immediately. Content that requires JavaScript execution is subject to rendering delays and potential failures.
Next.js App Router uses React Server Components by default, which render on the server and send HTML to the client. This is ideal for SEO. Client Components (marked with 'use client') still need careful consideration — ensure critical SEO content is not locked behind client-side-only rendering.
Related terms
JavaScript SEO
JavaScript SEO is the practice of optimizing JavaScript-heavy web applications so that search engines can effectively crawl, render, index, and rank their content.
Server-Side Rendering (SSR)
Server-side rendering (SSR) is a technique where the web server generates the complete HTML for a page on each request, sending fully rendered content to the browser and search engine crawlers.
Crawlability
Crawlability is the ability of search engine crawlers to access, navigate, and read the content of your website's pages without encountering technical barriers.
Technical SEO
Technical SEO encompasses the server-side and infrastructure optimizations that help search engines efficiently crawl, render, index, and rank your website's content.
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