Use when auditing metadata, crawlability, structured data, or indexability related to Add structured data markup. Verify the rendered HTML and HTTP response rather than relying only on source files.
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---
name: structured-data
description: "Use when auditing metadata, crawlability, structured data, or indexability related to Add structured data markup. Verify the rendered HTML and HTTP response rather than relying only on source files."
metadata:
category: seo
priority: high
difficulty: intermediate
estimatedTime: "25"
source: frontendchecklist.io
url: https://frontendchecklist.io/rules/seo/structured-data
---
# Add structured data markup
Structured data enables rich snippets with stars, prices, images, and FAQ dropdowns in search results—significantly increasing click-through rates.
## Quick Reference
- Structured data enables rich snippets in search results
- Use JSON-LD format (Google recommended)
- Common types: Article, Product, FAQ, HowTo, LocalBusiness
- Validate with Google Rich Results Test
## Check
Analyze if this webpage implements structured data using Schema.org vocabulary. Check for JSON-LD, Microdata, or RDFa markup.
## Fix
Add appropriate Schema.org structured data to this webpage based on its content type (Article, Product, LocalBusiness, etc.).
## Explain
Explain how structured data helps search engines understand page content and enables rich snippets in search results.
## Code Review
Review metadata generation, rendered HTML, structured data, and response headers related to Add structured data markup. Flag exact routes or templates where search-facing output violates the rule, and describe how to verify the final page output.
---
For full implementation details, code examples, and framework-specific guidance,
see `references/rule.md`.
Rule page: https://frontendchecklist.io/rules/seo/structured-data
