JSON-LD vs Microdata
A detailed comparison of JSON-LD and Microdata for structured data: syntax, maintainability, Google support, and which to choose in 2026.
When implementing structured data for search engines, you have three format options: JSON-LD, Microdata, and RDFa. JSON-LD and Microdata are the two most commonly used. This article compares them head-to-head so you can make an informed decision.
Quick Comparison
| Feature | JSON-LD | Microdata |
|---|---|---|
| Syntax | Separate <script> block |
Inline HTML attributes |
| Coupling | Decoupled from markup | Tightly coupled to HTML |
| Placement | <head> or <body> |
Within HTML content elements |
| Google preference | ✅ Recommended | ✅ Supported |
| Ease of implementation | ✅ Easy | ⚠️ Moderate |
| Maintenance | ✅ Easy to update | ⚠️ Brittle (tied to DOM) |
| CMS compatibility | ✅ Drop-in script | ⚠️ Requires template changes |
| Dynamic content | ✅ Easy with JS | ⚠️ Requires server-side logic |
JSON-LD: How It Looks
JSON-LD sits in a <script> tag, completely separate from your page content:
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "Article",
"headline": "JSON-LD vs Microdata",
"author": { "@type": "Person", "name": "Sanjay Samanta" },
"datePublished": "2026-06-14"
}
</script>Microdata: How It Looks
Microdata embeds structured data directly into your HTML using itemscope, itemtype, and itemprop attributes:
<article itemscope itemtype="https://schema.org/Article">
<h1 itemprop="headline">JSON-LD vs Microdata</h1>
<span itemprop="author" itemscope itemtype="https://schema.org/Person">
<span itemprop="name">Sanjay Samanta</span>
</span>
<time itemprop="datePublished" datetime="2026-06-14">June 14, 2026</time>
</article>Why Google Recommends JSON-LD
Google has explicitly stated that JSON-LD is their preferred format for structured data. The reasons:
-
No DOM dependency — JSON-LD doesn’t break when you redesign your page layout. Microdata attributes are tied to specific HTML elements, so a CSS refactor or HTML restructure can silently break your structured data.
-
Easier to generate dynamically — JSON-LD is just a JSON object. You can generate it from any data source (CMS, API, database) and serialize it into a script tag. Microdata requires modifying your HTML template structure.
-
Easier to validate — JSON-LD is valid JSON, so you can validate it with any JSON linter before deploying. Microdata validation requires parsing the full HTML DOM.
-
Multiple schemas per page — Adding a second JSON-LD block is trivial (just add another script tag). Adding a second Microdata schema requires restructuring your HTML.
When Microdata Still Makes Sense
Microdata isn’t obsolete. There are scenarios where it may be preferable:
- Static HTML pages — For simple, hand-coded pages with no build process, inline Microdata can be simpler than managing a separate JSON block.
- Guaranteed data-content alignment — Because Microdata is tied to the actual displayed content, it’s impossible for the structured data to say “Article Title” while the page actually shows something different.
- Legacy systems — Some older CMS platforms and plugins only support Microdata.
The Verdict
For new projects in 2026, use JSON-LD. It’s easier to implement, easier to maintain, and explicitly recommended by Google. Reserve Microdata for legacy systems where migration isn’t practical.
Related Resources
- What Is JSON-LD? — Introduction to JSON-LD.
- JSON-LD vs JSON — How JSON-LD differs from standard JSON.
- Schema.org JSON-LD: Developer’s Guide — Comprehensive implementation guide.