JSON to TOON Converter
Reduce LLM Tokens by 30-60%

Convert JSON to TOON format instantly. Reduce token usage for GPT-4, Claude, Gemini, and other LLMs.
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30-60%
Token Reduction
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JSON to TOON Converter

Convert your JSON data to TOON format instantly

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Complete Guide to TOON Format

Everything you need to know about TOON (Token-Oriented Object Notation) format

What is TOON Format?

TOON (Token-Oriented Object Notation) is a compact data serialization format designed specifically for Large Language Models (LLMs). It was created to reduce token usage by 30-60% compared to JSON while maintaining full data fidelity and compatibility.

TOON achieves token reduction by eliminating redundant punctuation, using whitespace for structure, and representing arrays as compact tables. Despite its compactness, TOON supports all JSON features including nested objects, arrays, and complex data structures.

Why Use TOON Instead of JSON?

Key Benefits

  • 30-60% Token Reduction: Significantly lower token usage means lower API costs
  • Faster Processing: Fewer tokens mean faster LLM response times
  • Same Functionality: Supports all JSON features without data loss
  • Universal Compatibility: Works with all major LLM providers
  • Human Readable: Still easy to read and understand

TOON Syntax

Simple Objects

name John
age 30
city New York

Nested Objects

user
  name Jane
  email jane@example.com
  settings
    theme dark
    notifications true

Arrays of Objects

#3
id name role
1 Alice admin
2 Bob user
3 Charlie user

The #3 indicates the number of columns. Arrays of objects are represented as tables with headers.

Use Cases

LLM Prompts

Include structured data in prompts with 30-60% fewer tokens, reducing costs and improving response times.

Function Calls

Pass function parameters in TOON format to reduce token usage in function calling scenarios.

API Responses

Convert API responses to TOON before sending to LLMs to optimize token usage.

Best Practices

  1. Use for structured data: TOON works best with structured, repetitive data
  2. Larger data = more savings: The larger your JSON, the more tokens you'll save
  3. Arrays of objects: TOON is especially efficient for arrays of similar objects
  4. Test your savings: Use our converter to see your exact token reduction
  5. Maintain readability: TOON is still human-readable, making debugging easier

Frequently Asked Questions

Everything you need to know about TOON format and our converter.

TOON (Token-Oriented Object Notation) is a compact data format designed specifically for LLMs. It reduces token usage by 30-60% compared to JSON while maintaining the same functionality. TOON uses minimal punctuation, represents arrays as tables with headers, and eliminates redundant syntax.

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