JavaScript SEO

JavaScript SEO focuses on rendering reliability. Search systems and users should be able to access the primary content, links, metadata, and page states that matter.

JavaScript is not automatically an SEO problem. It becomes risky when important SEO signals depend on fragile client-side behavior.

What to evaluate

• Primary content appears in rendered HTML.
• Important links use crawlable href attributes.
• Title, meta robots, canonical, and structured data are stable.
• API failures do not create indexable empty pages.
• Mobile rendering exposes the same important content.
• Large scripts do not create severe performance or interaction problems.

Common mistakes

Avoid hiding important navigation behind click handlers, relying on client-only metadata changes, and letting filters or infinite scroll create uncontrolled crawl paths.

The safest pattern for SEO-critical pages is meaningful HTML first, with client-side behavior used to enhance the experience.