Blitz Tools

JSON to TOON Converter

Optimize your LLM prompts with Token-Oriented Object Notation

Why Use TOON Format?

  • Save 30-60% on LLM tokens compared to formatted JSON for uniform arrays
  • LLM-friendly validation with explicit length markers and field headers
  • Human-readable format that combines YAML-like structure with CSV-like compactness
  • Perfect for passing structured data to Claude, GPT, and other LLMs

Benchmarks show 73.9% accuracy using 39.6% fewer tokens compared to JSON's 69.7% accuracy. Learn more at toonformat.dev