What is TOON?
TOON (Token-Oriented Object Notation) is a compact, human-readable format that reduces token usage by 30-60% compared to JSON. It combines YAML-style indentation for objects with CSV-style tabular arrays, making it ideal for LLM prompts and AI applications.
30-60% fewer tokens
Better LLM accuracy
Lossless conversion
JSON Input
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TOON Output
TOON Format Features
Objects
context: task: Description location: Boulder season: spring_2025
Inline Arrays
friends[3]: ana,luis,sam
Tabular Arrays (CSV-style)
hikes[3]{id,name,distanceKm,elevationGain}:
1,Blue Lake Trail,7.5,320
2,Ridge Overlook,9.2,540
3,Wildflower Loop,5.1,180