Schema Preview – Structured Data Analyzer

Schema Preview reveals the structured data behind any web page, checks it against best-practice rules, and shows exactly what's missing for rich results — no copying markup into an online tester. **What it does** - Detects JSON-LD, Microdata, and RDFa automatically, with a live count on the toolbar badge - Parses arrays and @graph, and resolves @id references between nodes - Completeness score (0–100) per schema, with required/recommended/optional coverage - Validation errors and warnings naming the exact missing fields - Google rich-result eligibility checks tied to Google's field requirements - Search-result (SERP) preview with stars and price - OpenGraph / Twitter Card / meta-tag overview - Reports JSON-LD syntax errors instead of failing silently - Deep links to schema.org and Google Search docs - Validates 47 common schema.org types; unknown types still shown - Filter, expand/collapse all, JSON viewer, copy and download - Dark and light themes; accessible, keyboard-navigable UI **Privacy first** Schema Preview is strictly read-only. It only reads markup already on the page, never modifies it, makes no network requests, and sends no data anywhere. No analytics, no tracking, no account.