Schema Preview

About

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.