- Crawling – The bot downloads the HTML code and identifies JS resources needed to render the page.
- Rendering – A headless browser executes the JS code to fully render the content.
- Indexing – The rendered page is processed and added to the search index.
Server-Side vs Client-Side Rendering
There are two main ways JS can be implemented:
- Server-Side Rendering (SSR) – JS executes on the server and returns rendered HTML. This is faster and easier to crawl.
- Client-Side Rendering (CSR) – JS executes in the browser to render content. Initial HTML is minimal. Provides more interactivity but can hinder crawling.
Generally, SSR is better for SEO while CSR allows more complex web apps. A hybrid approach is common.
Tips for JS SEO
- Check for rendering errors using site inspection tools.
- Don’t block critical JS resources in robots.txt.
- Minimize page load times as much as possible.
- Use internal links to help bots discover content.
- Prioritize loading content over images when lazy loading.
- Use static URLs instead of hash URLs.
- Consider SSR for important pages.
Regularly Audit Your Site
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