JSON-LD vs Microdata

4.1 The Fundamental Difference

Microdata embeds structured data directly in HTML tag attributes:

<div itemscope itemtype="https://schema.org/Product">
  <h1 itemprop="name">Classic Canvas Sneakers</h1>
  <span itemprop="description">Comfortable, breathable canvas shoes</span>
  <div itemprop="offers" itemscope itemtype="https://schema.org/Offer">
    <span itemprop="price" content="49.99">$49.99</span>
    <meta itemprop="priceCurrency" content="USD">
    <link itemprop="availability" href="https://schema.org/InStock">
  </div>
</div>

JSON-LD places structured data in a standalone script tag:

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Classic Canvas Sneakers",
  "description": "Comfortable, breathable canvas shoes",
  "offers": {
    "@type": "Offer",
    "price": "49.99",
    "priceCurrency": "USD",
    "availability": "https://schema.org/InStock"
  }
}
</script>

4.2 Detailed Comparison

Dimension	JSON-LD	Microdata
Location	Standalone `script` tag, typically in `head`	Embedded in HTML tag attributes
HTML coupling	Fully decoupled	Tightly coupled
Maintenance cost	Low — data changes do not affect page structure	High — markup changes may break page layout
Dynamic generation	Easy — backend outputs JSON	Difficult — requires HTML template modification
Readability	High — standard JSON format	Low — scattered across HTML tags
Google recommendation	Yes (officially preferred)	Supported but not preferred
AI agent parsing	More efficient (standard JSON parsing)	Requires DOM tree traversal
Multi-entity linking	Simple (JSON nesting)	Complex (requires `itemref` for cross-element references)
SSR/SSG compatibility	Fully compatible	Fully compatible
CSR (SPA) compatibility	Must ensure markup is visible to crawlers	Same

4.3 When Microdata May Be a Better Fit

Although JSON-LD is the general recommendation, there are a few scenarios where Microdata may be more appropriate:

Your CMS templates already output Microdata — If your WordPress theme already produces correct Microdata with complete fields, there is no need to refactor just to change formats
Markup must strictly match visible content — Microdata inherently guarantees consistency between markup and on-page content (because they are the same HTML)
Minimal pages — Simple scenarios with a single Product or single Article

4.4 Migrating from Microdata to JSON-LD

If you decide to migrate, follow these steps: Step 1: Extract existing Microdata Locate all itemscope and itemprop attributes on the page and document the data structure. Step 2: Build the equivalent JSON-LD Map each Microdata itemprop to its JSON-LD key:

Microdata	JSON-LD
Text content of `itemprop="name"`	`"name": "text content"`
`itemprop="price" content="49.99"`	`"price": "49.99"`
`itemtype="https://schema.org/Offer"`	`"@type": "Offer"`

Step 3: Add JSON-LD while keeping Microdata Run both formats simultaneously for 1-2 weeks. Use validation tools to confirm the JSON-LD output is correct before removing Microdata. Step 4: Remove Microdata attributes Delete itemscope, itemtype, and itemprop attributes from HTML tags. Be careful not to remove the tags themselves or their CSS class names.

Migration does not need to happen all at once. Start with the most important pages (product detail pages, homepage) and gradually expand to the entire site.

4.5 Validating the Migration

Post-migration validation is essential:

Use Google Rich Results Test to validate JSON-LD output
Compare data fields before and after migration to confirm nothing was lost
Monitor the Structured Data report in Google Search Console for errors

Next chapter: robots.txt Optimization — Precise access control configuration for AI crawlers

Schema.org structured data for AI agents robots.txt optimization for AI crawlers

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JSON-LD vs Microdata: format comparison

JSON-LD vs Microdata

4.1 The Fundamental Difference

4.2 Detailed Comparison

4.3 When Microdata May Be a Better Fit

4.4 Migrating from Microdata to JSON-LD

4.5 Validating the Migration

​JSON-LD vs Microdata

​4.1 The Fundamental Difference

​4.2 Detailed Comparison

​4.3 When Microdata May Be a Better Fit

​4.4 Migrating from Microdata to JSON-LD

​4.5 Validating the Migration

JSON-LD vs Microdata

4.1 The Fundamental Difference

4.2 Detailed Comparison

4.3 When Microdata May Be a Better Fit

4.4 Migrating from Microdata to JSON-LD

4.5 Validating the Migration