validate-schema

Validate schema.org structured data on URLs or local HTML using Google's validator.schema.org API.

Updated Jan 9, 2026

Search Tags:#SEO #validation #validate #web #JSON-LD #schema.org

Ready to run

npx skills add https://github.com/madsstoumann/agent-17 --skill validate-schema

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: validate-schema
Source: https://github.com/madsstoumann/agent-17/tree/main/.claude/skills/validate-schema
Command: npx skills add https://github.com/madsstoumann/agent-17 --skill validate-schema

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps verify that a URL or HTML page contains valid schema.org structured data (JSON-LD, Microdata, RDFa) by leveraging Google's validator.schema.org API, enabling quick SEO and data-quality checks.

Core Features & Use Cases

Validate JSON-LD, Microdata, and RDFa markup across URLs and local HTML files.
Identify errors and warnings to improve SEO, rich results, and data quality.
Use with live pages, static HTML, or localhost workflows, including JS-rendered pages via headless rendering where necessary.

Quick Start

Use the validator-schema skill to validate a URL or local HTML file and interpret the JSON output with a JSON parser.

Frequently Asked Questions about validate-schema

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I validate schema.org structured data on a live URL?▼

You can validate schema.org structured data on a live URL by submitting it to Google's validator.schema.org API, which checks JSON-LD, Microdata, and RDFa markup and returns errors, warnings, and SEO implications.

What is the best way to check JSON-LD markup for SEO errors?▼

The best way to check JSON-LD markup for SEO errors is using a validator that leverages Google's validator.schema.org API, identifying specific errors and warnings to help improve rich results and data quality.

Can I validate Microdata and RDFa markup, or does this only support JSON-LD?▼

Yes, you can validate Microdata and RDFa markup in addition to JSON-LD. The validation process leverages Google's API to surface errors, warnings, and SEO implications across all three structured data formats.

Does schema.org validation work with static HTML files or local pages?▼

Schema.org validation works with static HTML files and local pages. It can process local HTML alongside live URLs, and supports JS-rendered pages via headless rendering where necessary for accurate SEO checks.

Why does my schema.org validation return warnings for valid JSON-LD?▼

Schema.org validation returns warnings for valid JSON-LD when the markup lacks recommended properties or does not fully meet Google's rich result guidelines, helping you identify opportunities to improve SEO and data quality.

What are the limitations of using the Google validator.schema.org API for SEO checks?▼

A limitation of using the Google validator.schema.org API for SEO checks is that it validates syntax and schema compliance but does not guarantee rich result eligibility, requiring you to interpret the JSON output to address data quality.