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/ JSON to TOON

JSON

TOON

About TOON Format

30-60% fewer tokens on large uniform arrays vs JSON
Tabular arrays: Declare keys once, stream data as rows
Indentation-based: Like YAML, uses whitespace instead of braces
Minimal syntax: Removes redundant punctuation

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JSON to TOON

Convert between JSON and TOON (Token-Oriented Object Notation) for efficient LLM communication

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What is TOON?

TOON (Token-Oriented Object Notation) is a data format designed to make communication with Large Language Models (LLMs) more accurate and token-efficient. It typically achieves 30-60% fewer tokens on large uniform array…

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How does it work?

TOON optimizes JSON by using a tabular format for uniform arrays. Instead of repeating object keys for each array item, TOON declares the structure once using the format [length]{keys}: followed by comma-separated value…

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Sample Cases

Covers Simple array conversion and Shopping cart (43% token savings) so you can compare common inputs and outputs quickly.

/ Code

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/ Integration

Source code from the selected tool, shown here alongside the live version on the right.

/ Source Code

TypeScript

typescript

// TypeScript: Convert JSON to TOON and vice versa

function jsonToToon(jsonString: string): string {
  const obj = JSON.parse(jsonString);

  // Check if uniform array
  if (Array.isArray(obj) && obj.length > 0) {
    const keys = Object.keys(obj[0]);
    const isUniform = obj.every(item =>
      Object.keys(item).length === keys.length &&