SEO Tools
Structured Data / Schema Checker
Check a page for JSON-LD structured data (Schema.org markup).
Enter a URL to check for JSON-LD structured data (Schema.org markup).
JustChecker tracks your on-page SEO signals continuously.
Frequently Asked Questions
It provides search engines with explicit, machine-readable context about your content (a product's price, a recipe's cook time, an article's author) - beyond just helping ranking, this is what enables rich search result features like star ratings or FAQ dropdowns.
No - it makes your page eligible for rich result treatment if the search engine chooses to display it, but eligibility isn't a guarantee, and search engines can change which rich features they support over time.
It depends entirely on your content type - Organization/WebSite markup is broadly useful for most sites, while Product, Article, Recipe, or FAQPage markup makes sense specifically for pages matching those content types.
Search engines will typically just ignore markup with errors rather than penalizing the page for it, but ignoring it means missing out on the specific benefits (rich results, better content understanding) the markup was meant to provide.
It's the specifically recommended format by major search engines today (over older alternatives like Microdata or RDFa), largely because it's cleanly separated from your HTML markup and easier to implement and validate correctly.