TOON ↔ JSON Converter

Convert between TOON (Token-Oriented Object Notation) and JSON. TOON uses 39.6% fewer tokens for LLMs while maintaining full JSON compatibility.

Why TOON?

  • • 39.6% fewer tokens compared to JSON on average
  • • 73.9% accuracy vs JSON's 69.7% for LLM parsing
  • • Tabular format eliminates repeated field names (up to 60% savings)
  • • Human-readable with indentation-based syntax
  • • Fully compatible with JSON data model

Quick Examples

TOON Format Features

Indentation-Based

No braces or brackets - uses indentation like Python or YAML

Minimal Quoting

Strings unquoted by default, quoted only when necessary

Tabular Arrays

Uniform arrays declare fields once, saving massive tokens

Array Headers

Explicit length declarations: [N] with configurable delimiters

When to Use TOON

✓ Perfect For
  • • LLM prompts & context
  • • API responses
  • • Database query results
  • • Analytics data
  • • Configuration files
~ Good For
  • • Mixed data structures
  • • Nested objects
  • • General data exchange
✗ Consider Alternatives
  • • Pure tabular data (use CSV)
  • • Browser environments only
  • • Legacy system integration