ItemList & Carousel Schema Markup (JSON-LD Blueprint)
Structured data for curated top lists, best-of rankings, category archives, and multi-entity carousel cards in SERPs.
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Production JSON-LD Code Block
Embed this structured data block directly into your HTML <head> or framework layout template.
{
"@context": "https://schema.org",
"@type": "ItemList",
"name": "Top 5 Free Technical SEO Utilities in 2026",
"description": "Curated benchmark list of high-speed client-side developer tools for webmasters.",
"itemListOrder": "https://schema.org/ItemListOrderDescending",
"numberOfItems": 5,
"itemListElement": [
{
"@type": "ListItem",
"position": 1,
"name": "Client-Side JSON-LD Schema Validator & Linter",
"url": "https://omniseotools.com/tools/schema-validator"
},
{
"@type": "ListItem",
"position": 2,
"name": "Canonical URL & Redirect Loop Auditor",
"url": "https://omniseotools.com/tools/canonical-redirect-auditor"
},
{
"@type": "ListItem",
"position": 3,
"name": "AI Crawler & Scraper Firewall Configurator",
"url": "https://omniseotools.com/tools/ai-crawler-firewall"
},
{
"@type": "ListItem",
"position": 4,
"name": "Core Web Vitals Budget & Resource Hint Calculator",
"url": "https://omniseotools.com/tools/core-web-vitals-budget-calculator"
},
{
"@type": "ListItem",
"position": 5,
"name": "Open Graph & Twitter Card Image Safe-Zone Previewer",
"url": "https://omniseotools.com/tools/open-graph-image-safe-zone"
}
]
}Typed Properties Specification (6 Fields)
Key Schema.org properties and sub-objects required to qualify for rich snippet treatment in Google Search.
| Property | Expected Type | Status | Description & Example |
|---|---|---|---|
| name | Text | Required | Title of the curated list. e.g. Top 5 Free Technical SEO Utilities |
| itemListElement | Array<ListItem> | Required | Numbered list items with target item URLs. e.g. [{ "@type": "ListItem", "position": 1, ... }] |
| itemListOrder | URL | Recommended | Ascending, Descending, or Unordered declaration. e.g. https://schema.org/ItemListOrderDescending |
| numberOfItems | Integer | Recommended | Total count of items in list. e.g. 5 |
| description | Text | Recommended | Summary overview of list methodology. e.g. Curated benchmark list of developer tools. |
| mainEntityOfPage | URL | Recommended | Canonical URL of the host ranking page. e.g. https://omniseotools.com/tools |
Google Search Console Pitfalls & Critical Warnings
Avoid these 3 common validation traps, parser errors, and algorithmic policy penalties when deploying ItemList schema.
Mismatched position Order Sequence
Skipping numbers (e.g. 1, 2, 4) in itemListElement position indices.
Ensure continuous sequential numbering starting from 1.
Target URLs Linking to 404 Pages
Providing URLs in list items that redirect or 404.
Validate that all item URLs resolve to active canonical 200 OK pages.
Overstuffing List Beyond Visible Page Content
Including 50 items in schema while displaying only 5 on the webpage.
Align structured list exactly with user-visible content.
Recommended Implementation Scenarios
Related Schema Blueprints
Explore complementary structured data blueprints across the Technical SEO cluster.
Displayed below main page header or above the tool container. • Zero CLS Container