TOON reduces token count by 20-60% compared to JSON, making it ideal for LLM prompts and API responses.
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JavaScript Object Notation is the most widely used data interchange format. Lightweight, easy to parse, and supported by every programming language.
TOON (Token-Oriented Object Notation) is a line-oriented format optimized for LLMs. It reduces token count by 20-60% compared to JSON while maintaining readability.
Use TOON when building LLM-powered applications, optimizing API costs, or when you need compact, readable data for AI models.
Paste your JSON into the editor on json2toon.co. The tool detects the input and produces TOON instantly, then you copy the result. Conversion runs entirely in your browser, so nothing is uploaded to a server.
Yes. Converting JSON to TOON on json2toon.co is free with no account, signup, or usage limit. A free public API is also available for automated, programmatic conversion.
TOON reduces token count by 20-60% compared to JSON, making it ideal for LLM prompts and API responses.
Yes. The JSON to TOON conversion happens client-side in your browser. Your source data stays on your device and is never sent to or stored on a server, which makes it safe for private or sensitive payloads.