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TOON Tools

Editor, Validator, and Formatter for TOON

Input
Output

About TOON Format

TOON (Token-Oriented Object Notation) is a compact, schema-aware serialization format designed for LLMs and AI applications. It reduces token usage by 30-60% compared to JSON while maintaining human readability.

Key Features:

  • Tabular format for uniform arrays: users[2]{id,name}:
  • Minimal syntax - no redundant braces or quotes
  • Schema-aware with explicit array lengths
  • Lossless conversion to/from JSON
  • YAML-like indentation for readability

Example:

users[2]{id,name,role}:
  1,Alice,admin
  2,Bob,user

Learn more at toonformat.dev