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Course 05: Rendering

JavaScript SEO

JavaScript frameworks power many modern websites, but content and links generated in the browser do not always reach search engines the same way they reach users.

Google can render JavaScript, but rendering adds a step that can fail, and many AI crawlers do not render JavaScript at all. Understanding the difference between raw HTML and rendered HTML is the foundation of JavaScript SEO.

In this course, you’ll learn how to check rendering, make links crawlable, handle dynamic content, and diagnose JavaScript indexing problems.

Start with rendering What you’ll learn

4 short lessons. Intermediate. Builds on Site Audits and Technical SEO.

Your learning path 4 lessons
01
RenderingRaw HTML, DOM, CSR and SSR
 02
JavaScript linksCrawlable anchors and routing
 03
Dynamic contentLazy loading, tabs, and injected data
 04
IndexingDiagnosing unindexed JS pages
Raw HTML versus rendered HTMLEvery lesson returns to one comparison: what the server sends and what exists after JavaScript runs.

Lessons 01 to 04

What you’ll learn

Each lesson covers one way JavaScript affects discovery, rendering, or indexing, with checks you can run in a crawl.

01Rendering

Rendering

How Google renders JavaScript and how CSR, SSR, and SSG change what crawlers see.

  • Raw vs rendered HTML
  • Web Rendering Service
  • CSR and SSR
  • Hydration
  • Rendering failures
Open lesson
02Discovery

JavaScript links

Which link patterns crawlers follow and how to make JavaScript navigation discoverable.

  • Anchor href
  • Client-side routing
  • Hash URLs
  • Infinite scroll
  • Rendered-only links
Open lesson
03Content

Dynamic content

How API content, lazy loading, tabs, and injected tags are rendered and indexed.

  • Lazy loading
  • Interaction-gated content
  • Modified meta tags
  • Soft 404s
  • Injected schema
Open lesson
04Indexing

Indexing

How to diagnose and fix JavaScript pages that are not indexed.

  • Indexing pipeline
  • URL Inspection
  • Rendered duplicates
  • Indexing speed
  • AI indexing
Open lesson

Context

Why JavaScript SEO matters

A page that works perfectly in a browser can still be empty to a crawler if its content depends on JavaScript that fails, times out, or is never executed.

JavaScript SEO makes sure important content, links, and signals are available to search engines and AI systems, not only to users.

In SiteAuditLint

Compare raw and rendered crawls

SiteAuditLint can crawl with or without JavaScript rendering, so you can compare titles, canonicals, content, and links in each version.

Use custom source search to confirm that dynamic content appears in the rendered HTML across every crawled URL.

Before moving on

Course checklist

Make sure you understand:

  • The difference between raw HTML and rendered HTML
  • How CSR, SSR, SSG, and hydration affect SEO
  • Which JavaScript link patterns crawlers can follow
  • How dynamic, lazy-loaded, and interaction-gated content is handled
  • How to diagnose JavaScript indexing problems

Summary

Key takeaway

JavaScript SEO is about making sure the content, links, and signals that matter exist in HTML that search engines and AI crawlers can reliably read.

The lessons examine each step in more detail, starting with rendering.

Continue to rendering
Builds on earlier courses. Review Site Audits for the audit workflow, or revisit Crawling and Indexing in SEO Fundamentals.