SCHEMA MARKUP VALIDATOR

Validate & Fix Structured Data

Make your schemas accessibile for LLMs and Search Crawlers with actionable fixes

Input

Paste HTML/JSON-LD or fetch a URL to validate.

Paste HTML with <script type="application/ld+json"> or raw JSON-LD. The parser detects blocks and [itemscope] microdata.

Preview

Paste markup to validate structured data blocks without sharing your data.

What is structured data for SEO?

Structured data is machine-readable markup that helps search engines understand your page content. It can unlock rich results, better indexing, and clearer signals for both traditional search and AI answers. For a full overview, see our guide on structured data for SEO.

What is schema markup?

Schema markup is code (usually JSON-LD, Microdata, or RDFa) that describes your content using a shared vocabulary—typically schema.org. It tells search engines and other systems what your page is about (e.g. Article, Product, FAQ) and which properties it has (headline, author, price), so they can interpret and display it correctly.

How is structured data used by LLMs?

Large language models and AI search systems can use structured data as a reliable source of facts—dates, authors, entities, and relationships—instead of inferring them from plain text. For more on why this matters and how to design for it, read structured data for LLMs.

What this tool does

This validator helps you check and fix structured data and schema markup on your pages. It:

  • Validates structured data and schema markup (JSON-LD and microdata) against schema.org and common SEO rules.
  • Suggests fixes for each issue with copyable snippets so you can correct errors and add missing properties.

How to use this Structured Data Validator

Follow these steps to validate and fix your markup:

  1. Paste HTML/JSON-LD or fetch a live page.
  2. Review the verdict and confidence at the top.
  3. Open each block to see issues and copy fixes.

Paste mode runs in your browser; fetch mode retrieves HTML once and does not store it.

Features explained

Paste & Fetch

Validate offline snippets or fetch live HTML; both modes stay client-side for parsing.

JSON-LD & Microdata

Detect structured data blocks, required properties, and schema.org context issues.

Copyable fixes

Each issue includes a ready-to-copy fix snippet so you can patch quickly.

Best practices for structured data

Keep schema.org context

Always include `@context": "https://schema.org"` so search engines understand the type.

Fill required props

Add required fields such as `headline`, `author`, `datePublished`, or `offers` before publishing.

Validate nested items

Ensure nested objects (Author, Publisher, FAQ answers) also include `@type` and key props.

Frequently Asked Questions

Related tools

SERP Snippet Preview

Preview titles and meta descriptions as they may appear in search results.

JSON Visualiser

Format, tree view, and copy-ready JSON-LD with indentation presets.

Robots.txt Checker

Follow up on disallowed content by ensuring crawlers can reach your markup.