AI Communication Standards Glossary

llm.json

A structured JSON file that provides machine-parseable identity and metadata about a website, designed for AI systems, data pipelines, and retrieval tools.

Also known as: LLM JSON file, AI identity file

llm.json is a structured JSON file, typically placed at /ai/llm.json or /llm.json, that provides machine-parseable metadata about a website. Unlike llms.txt which is optimized for natural language reading, llm.json is optimized for programmatic processing. It can contain the site's name, URL, description, organization details, subject matter areas, key entities, content categories, available endpoints (AI sitemaps, entity maps, content indexes), and links to related resources. Data pipelines, retrieval systems, and AI agents can parse llm.json to understand a site's structure without crawling individual pages.

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Related Terms

  • llms.txt — A plain-text file placed at a website's root that gives AI language models a concise, human-readable overview of what the site is and what it contains.
  • AI Sitemap — A structured JSON file that gives AI systems a typed, organized index of a website's content ... more detailed and machine-useful than a standard sitemap.xml.
  • Entity Map — A structured inventory of the real-world entities (people, organizations, concepts, topics) that a website covers, with their definitions and relationships.