Reduce Your LLM Token Costs by up to 60%
TOON (Token-Oriented Object Notation) is a compact, human-readable serialization format designed to minimize token usage when passing structured data to Large Language Models. Optimize for ChatGPT, Claude, GPT-4, GPT-3.5, and all major AI models. Built for AI developers, prompt engineers, and anyone working with LLMs to reduce API costs.
TOON is a compact, human-readable format designed to reduce token usage when passing structured data to LLMs. It uses header-based formatting to eliminate redundant syntax, reducing token counts by 30-60% compared to JSON.
Optimize your LLM API costs with token-efficient data formatting.
Reduce token counts significantly, leading to substantial cost savings on every LLM API call.
Works with ChatGPT, Claude, GPT-4, GPT-3.5, and all major AI models. Select your model to see accurate token counts.
See exactly how many tokens you're saving with live calculations. Compare JSON vs TOON token counts instantly.
Convert between JSON and TOON bidirectionally without any data loss. Perfect for API integrations.
All processing happens in your browser. Your data never leaves your device, ensuring complete privacy.
Designed for AI developers, prompt engineers, and anyone working with Large Language Models.
Reduce your LLM token costs in three simple steps
Copy and paste your JSON data or upload a JSON file. Our validator will check it automatically and convert it to TOON format.
Select your LLM model (ChatGPT, Claude, etc.) and see real-time token count comparison. View your cost savings instantly.
Copy the TOON format and use it in your LLM prompts. Save up to 60% on token costs with every API call.
{
"users": [
{ "id": 1, "name": "Alice", "role": "admin" },
{ "id": 2, "name": "Bob", "role": "user" }
]
}users[2]{id,name,role}:
1,Alice,admin
2,Bob,userEverything you need to know about TOON format and token optimization
TOON is a compact, human-readable serialization format designed to reduce token usage when passing structured data to Large Language Models. It uses header-based formatting to eliminate redundant syntax, reducing token counts by 30-60% compared to traditional JSON.
TOON can reduce token counts by 30-60% compared to JSON, depending on your data structure. Uniform arrays of objects see the greatest savings. Our tool shows you exact token counts and cost savings for your specific data and chosen LLM model.
TOON works with all major LLM models including ChatGPT (GPT-4, GPT-3.5), Claude (Claude 3, Claude 2), and others. Our tool lets you select your model to see accurate token counts and cost estimates.
Yes! TOON supports bidirectional conversion with JSON, ensuring no data loss during transformation. You can convert JSON to TOON and back to JSON without any information loss.
Yes! Our JSON to TOON converter is completely free to use with no hidden costs, subscriptions, or premium features. No registration required - just paste your JSON and start saving on token costs.
No! All processing happens entirely in your browser. Your JSON data never leaves your device, ensuring complete privacy and security. Perfect for sensitive data.
TOON is most effective for uniform arrays of objects (like user lists, product catalogs, etc.) where the same keys are repeated. The header-based format eliminates redundant key names, resulting in the greatest token savings.
Yes! TOON is designed for production use. It's a lossless format that can be used anywhere JSON is used, with the added benefit of reduced token costs when sending data to LLMs.
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