toon
🎒 Token-Oriented Object Notation (TOON) – compact, human-readable serialization of JSON data for LLM prompts. TypeScript SDK, CLI, benchmarks.
Encode JSON data in a compact format that is easy for AI models to understand.
From the README
npm install -g @toon-format/cli
- alerts[2]: frost,wind is inline form: a primitive array on its header line.
- forecast[3]{day,…}: is tabular form: the field list is declared once in the header, then one row per element.
- temp{min,max} inside that header is a nested field group: the uniform nested temp objects fold into the header while rows stay flat.
Excerpts from the project README on GitHub. Copyright and licensing remain with the respective authors.
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Free · no card · unsubscribe anytime🎒 Token-Oriented Object Notation (TOON) – compact, human-readable serialization of JSON data for LLM prompts. TypeScript SDK, CLI, benchmarks.
toon has 25.3k stars on GitHub. It has been forked 1.1k times. toon is written mainly in TypeScript. It has been in active development since 2025. toon is available under the MIT license. Its main topics are data-format, llm, serialization, tokenization.
What is toon?
🎒 Token-Oriented Object Notation (TOON) – compact, human-readable serialization of JSON data for LLM prompts. TypeScript SDK, CLI, benchmarks.
Is toon open source?
toon is an open-source project. It is released under the MIT license.
Is toon free?
Yes. toon is free and open source — you can use, modify and self-host it.
What license does toon use?
toon is available under the MIT license.
What language is toon written in?
toon is written mainly in TypeScript.
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