TOON Converter - JSON to TOON Parser

Free online TOON converter tool. Convert JSON to TOON and TOON to JSON instantly. TOON format reduces AI token usage significantly for uniform data structures, lowering API costs for LLM applications.

Input: JSON

Paste or upload your JSON data

Output: TOON

Converted TOON output

Why Use TOON Format?

The most efficient data format for AI applications and LLMs

Optimize AI Token Usage & Reduce Costs

TOON (Token-Oriented Object Notation) is specifically designed to minimize token count for AI and LLM applications. By removing unnecessary quotes, commas, and whitespace, TOON achieves significant token savings, especially for uniform data structures.

� Token Efficiency:

  • Uniform arrays: 30-60% fewer tokens vs formatted JSON
  • Mixed structures: ~22% fewer tokens vs formatted JSON
  • vs Compact JSON: Uses slightly more tokens but provides better LLM accuracy (73.9% vs 70.7%) and structure validation

TOON's sweet spot is uniform arrays of objects (same structure across items), where it achieves CSV-like compactness while adding explicit structure that helps LLMs parse and validate data reliably.