# Structured Data Checker

https://rankproof.eu/tools/seo-structured-data

## Short answer

Validate Schema.org structured data and rich snippet eligibility.

## What It Does

Extracts every JSON-LD block on your page, checks that each one parses as valid JSON and lists the schema.org types it declares (Organization, Product, Article and so on). Flags pages with no structured data or with a block that fails to parse.

## How It Works

1. Enter a page URL or paste its HTML
2. We extract every JSON-LD script block from the HTML
3. Parse each block and collect the schema.org types it declares
4. Return the block count, the types found and any parse errors

## Sample input + output

INPUT

```text
url: https://rankproof.eu/tools
```

OUTPUT

```text
JSON-LD blocks: 4
types found: Organization, WebSite, Product, FAQPage
parse errors: 0                       OK

Score: 100/100
```

## Why It Matters

Structured data describes a page in a form search engines can read, and Google uses it for rich results such as product prices, review stars and breadcrumbs. A JSON-LD block that does not parse is ignored completely, and one CMS or plugin update can break every page that shares a template. Checking the markup after each release catches that early.

## Who Uses This

- **Technical SEO**: Before launch, confirm the Article, Product and BreadcrumbList blocks on each template parse without errors.
- **E-commerce developer**: Check a product template after every platform update to catch broken Product markup.
- **Content manager**: Confirm the Article markup on your top articles still parses after a theme or plugin update.

## Frequently Asked Questions

### Does it check rich result eligibility?

No. It checks that each JSON-LD block parses and lists the types it declares. Each rich result has its own required properties; check those with Google's Rich Results Test.

### Should I use JSON-LD, microdata or RDFa?

Google supports all three and recommends JSON-LD, which is the easiest to add and maintain. This tool reads JSON-LD only.

### Which types can still earn rich results?

Google lists the supported types in its Search Gallery, for example Article, Product, Breadcrumb, Event, Local business, Recipe and Review snippet. FAQ and HowTo rich results are no longer shown in Google Search.

### Does it see markup added by JavaScript?

No. It reads the HTML as delivered, so JSON-LD that scripts add later is not included.

## Related Tools in SEO Analysis

- [Title & Meta Description Checker](https://rankproof.eu/tools/seo-meta-title)
- [Heading Tag Checker](https://rankproof.eu/tools/seo-heading-tags)
- [Image Alt Text Checker](https://rankproof.eu/tools/seo-image-alt)
- [Canonical URL Checker](https://rankproof.eu/tools/seo-canonical-url)
- [Robots.txt Analyzer](https://rankproof.eu/tools/seo-robots-txt)
- [robots.txt Generator](https://rankproof.eu/tools/seo-robots-txt-generator)