Free JSON to TOON Converter

What is TOON (Token-Oriented Object Notation)?

TOON (Token-Oriented Object Notation) is a revolutionary data format specifically designed to reduce token consumption when working with Large Language Models (LLMs) like GPT-4, Claude, Gemini, and other AI models. Unlike traditional JSON, which repeats field names for every object in an array, TOON declares the schema once and streams only the values.

This JSON to TOON converter helps developers, data scientists, and AI engineers optimize their LLM API costs by converting standard JSON data into the more efficient TOON format. With typical token savings of 30-60%, TOON can dramatically reduce your OpenAI, Anthropic, or Google AI API bills.

How Does JSON to TOON Conversion Work?

Our free online JSON to TOON converter analyzes your JSON structure and applies intelligent optimization:

• Tabular Optimization: Arrays of uniform objects are converted to a compact table format with headers declared once
• Smart Quoting: Strings are only quoted when necessary, reducing unnecessary punctuation tokens
• Indentation-Based Structure: Like YAML, TOON uses whitespace for hierarchy instead of brackets and braces
• Delimiter Options: Choose between comma, tab, or pipe delimiters for maximum token efficiency

TOON vs JSON: Side-by-Side Comparison

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

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

Frequently Asked Questions

Is this JSON to TOON converter free?

Yes! Our online JSON to TOON converter is completely free to use. No registration, no limits, no hidden fees. Convert as much data as you need.

Is my data safe? Do you store my JSON files?

Absolutely safe! All conversion happens in your browser using JavaScript. We never send your data to our servers or store it anywhere. Your privacy is guaranteed.

Which LLM models support TOON format?

TOON works with all major LLM APIs including OpenAI GPT-4/GPT-5, Anthropic Claude, Google Gemini, Meta Llama, and others. LLMs understand TOON naturally due to its similarity to CSV and YAML.

Can I convert TOON back to JSON?

Yes! The TOON format is fully reversible. Check the official TOON specification for decoder implementations in multiple programming languages including TypeScript, Python, Go, Ruby, and more.