JSON to TOON Converter - Optimize LLM Token Usage | Free Online Tool

Free online JSON to TOON converter. Reduce LLM API costs by 30-60% with token-optimized TOON format. Bidirectional conversion, instant results, privacy-focused.

JSON Input

💡 Why Use TOON Format?

✓ 30-60% fewer tokens = Lower LLM API costs
✓ Cleaner syntax = Better LLM comprehension
✓ Tabular arrays = Optimal for structured data

📖 How to Convert JSON to TOON

1
Paste your JSON data or click 'Load Sample' to see an example
2
Select conversion direction: JSON → TOON or TOON → JSON
3
Click 'Convert' to transform your data instantly
4
Copy the optimized result and use it in your LLM prompts to save tokens

❓FAQ

Q: What is TOON format and why should I use it?

A: TOON (Token-Oriented Object Notation) is a data format specifically designed to optimize token usage when interacting with Large Language Models (LLMs). It reduces token counts by 30-60% compared to JSON by using indentation-based structure and tabular layouts for arrays, similar to YAML and CSV. This directly translates to lower API costs for services like ChatGPT, Claude, and other LLM providers that charge per token.

Q: When should I use TOON instead of JSON?

A: Use TOON when sending data to LLMs for processing, especially for structured data like lists of users, products, or messages. TOON is most effective with uniform arrays of objects. Keep using JSON for your application's internal data storage and APIs, then convert to TOON only when interacting with LLMs. For deeply nested or non-uniform data, JSON might actually be more efficient.

Q: How much can I save with TOON format?

A: TOON typically reduces token usage by 30-60% compared to JSON, with the highest savings on uniform tabular data. For example, a list of 100 users in JSON might use 2,000 tokens, while the same data in TOON could use only 800-1,400 tokens. At $0.002 per 1K tokens (typical GPT-4 pricing), this can lead to significant cost savings for high-volume applications.

Q: Is my data safe when using this converter?

A: Absolutely! All conversion happens entirely in your browser using JavaScript. Your data never leaves your device or gets sent to any server. This ensures complete privacy and security for sensitive information. You can even use this tool offline once the page is loaded.