Schema Markup Validator
Validates Schema.org markup on any page
Validator for Schema.org markup that checks JSON-LD, Microdata and RDFa on a URL or pasted code. It is not tied to Google's rich result rules.
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llms.txt
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Proposed standard for LLM-friendly site summaries
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Directory and robots.txt rules for AI crawlers
JSON-LD
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W3C format for linked data in JSON
llms-txt-hub
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Directory of sites that publish llms.txt
Mintlify
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Docs platform that generates llms.txt files
Rich Results Test
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Google's tool for testing structured data