Can crawlers see your content without running JavaScript?
Search engines render JavaScript — slowly, and not always. AI crawlers, social scrapers and fast fetchers mostly do not. If your price, name or description only exists after a script runs, a lot of readers never see it.
Reads raw server HTML on a sample of key pages — the same bytes a crawler receives first. Nothing is stored.
How this check works
Shipwork fetches your pages and inspects only the raw HTML, before any script runs. It reports product prices or names that are absent from the source, and pages that look like a bare JavaScript shell. When the essentials are missing, the paid rendered crawl runs a real browser to measure exactly what is built client-side.
Questions
- Do search engines run JavaScript?
- Google does, though on a slower second pass. Bing renders less. AI crawlers, social scrapers and most fetchers do not run it at all.
- How do I know if my content is JS-only?
- View source, not the inspector. If the price or name is not in the raw HTML, it is injected by JavaScript.
- What is the fix?
- Server-render the essentials — name, price, availability, key content — so the first response already contains them.
- Is this the same as the rendered crawl?
- This is a free signal from raw HTML. The rendered crawl runs an actual headless browser to see everything JavaScript builds, page by page.