JavaScript SEO: making sure Google renders your content
Learn how Google renders JavaScript, what breaks indexing, and how to test if your JS content is visible.
JavaScript powers most modern sites. Google can render it, but it’s not automatic or perfect.
JavaScript SEO is about making sure the content you want indexed actually makes it into Google’s index.
How Google handles JavaScript
Google does two passes:
- First pass: crawls HTML and queues the page for rendering
- Second pass: renders JavaScript and indexes the content
The second pass can be delayed. If your content only loads after JS runs, it may not be indexed right away—or at all, if there are errors.
Common JavaScript SEO issues
- Content loaded too late: Google may not wait forever for everything to load
- Critical content requiring user interaction: tabs, accordions, or buttons that hide content until clicked
- Broken JS that stops rendering: a single error can prevent content from being seen
- Links added via JS: Google should find them, but it’s safer to have important links in raw HTML
Use our Bot Simulator to see how your page renders to a crawler.
Best practices
- Make critical content available without JS: it doesn’t have to be pretty, but it should be there
- Keep render times fast: faster pages get rendered more reliably
- Test, don’t guess: use real tools to verify what’s being indexed
JavaScript isn’t the enemy. But it does require testing.
Link back to the glossary
Quick definition: JavaScript SEO.
Related wiki terms
Q&A
Is JavaScript bad for SEO?
No, but it adds complexity. Modern Google can render JavaScript well, but you still need to test and avoid common mistakes.
Should I pre-render or use server-side rendering?
It depends on your stack. The goal is the same: make content available to crawlers quickly and reliably.
How do I test JavaScript rendering?
Use Google Search Console's URL Inspection Tool, our [Bot Simulator](/bot-simulator/), or view-source vs. inspect in the browser.