Free Schema Markup Checker

Schema markup is structured data — usually written as JSON-LD inside a script tag — that tells search engines exactly what your page contains. Instead of guessing whether a page is a product, an article, an organization or a FAQ, Google reads the schema and knows. Pages with valid structured data can earn rich results in search: star ratings, FAQ dropdowns, breadcrumbs, prices and event details that take up more space and attract more clicks than a plain blue link.

Schema markup matters just as much for GEO — Generative Engine Optimization. AI assistants and AI search engines such as ChatGPT, Perplexity and Google's AI Overviews rely on structured data to understand who you are and what you offer. A clear Organization schema tells an AI which company a page belongs to; a SoftwareApplication schema explains what your tool does and what it costs; a FAQPage schema gives AI models ready-made question-and-answer pairs they can quote. Sites without structured data force AI engines to infer everything from unstructured text, which leads to vague or wrong citations. Sites with clean JSON-LD get described accurately — and get cited more often.

This free Schema Markup Checker fetches your page's live HTML and extracts every JSON-LD block it finds. It verifies that each block is syntactically valid JSON, lists the schema types in use, and flags pages that serve no structured data at all. Because the check runs on the real HTML your server returns, it catches the problems that actually hurt you: broken JSON that parsers silently skip, duplicate or conflicting blocks, and missing schemas on pages that should have them.

The checker is part of the full Your SEO Analyzer audit, so after the scan you also see how your structured data fits into the bigger picture: meta tags, headings, Core Web Vitals, sitemap and robots.txt status, security headers and our GEO readiness score — which grades how well your site is prepared for AI search engines, including llms.txt and AI crawler rules. Everything is free, requires no account, and results arrive in seconds. Paste a URL above and see exactly what search engines and AI models can read from your page.