JSON to TOON Converter
Compress JSON data into TOON format and reduce LLM prompt tokens by up to 70%. Perfect for AI developers, prompt engineers, and anyone working with large JSON payloads.
📄 JSON Input
⚡ TOON Output
✨ Why Use TOON Format?
TOON dramatically reduces token usage while maintaining data integrity
Up to 70% Token Reduction
Compress JSON data significantly while preserving all information
LLM-Friendly Format
Optimized for ChatGPT, Claude, GPT-4, and other language models
Save API Costs
Reduce token usage means lower costs for API calls
Privacy First
All conversion happens in your browser - no data sent to servers
Instant Conversion
Real-time conversion with immediate token count feedback
Multiple Modes
Choose between normal, ultra-compact, or pretty formatting
📊 Real-World Performance
See how TOON performs with actual data structures
| Dataset | JSON Tokens | TOON Tokens | Savings |
|---|---|---|---|
| GitHub User API | 514 | 219 | 57% |
| Stripe Invoice | 1,721 | 693 | 59% |
| Product Catalog (500 items) | 13,912 | 4,081 | 70% |
| OpenAI API Response | 892 | 341 | 61% |
🎯 Perfect For
Discover how different professionals use TOON format
AI Developers & Prompt Engineers
Reduce token usage in prompts when working with large JSON datasets. Perfect for ChatGPT, Claude, and GPT-4 applications.
API Developers
Optimize API responses and reduce bandwidth costs while maintaining data integrity and readability.
Data Scientists
Compress large datasets for LLM analysis without losing important information or structure.
DevOps Engineers
Optimize configuration files and reduce storage costs while maintaining human readability.
❓ Frequently Asked Questions
Everything you need to know about TOON format
What is TOON format?
TOON (Token-Oriented Object Notation) is a compact data format designed specifically to reduce token usage in LLM prompts. It maintains data structure and readability while significantly reducing the number of tokens compared to standard JSON.
How much can I save with TOON?
Typical savings range from 50-70% depending on your data structure. Arrays of objects with consistent schemas see the highest savings. Simple nested objects typically save 40-50%.
Can LLMs understand TOON format?
Yes! Modern LLMs like GPT-4, Claude, and others can easily parse TOON format. You can include a brief explanation in your prompt, or the model will often understand it contextually.
Is TOON reversible back to JSON?
Yes, TOON is fully reversible. You can convert TOON back to JSON without any data loss. The format preserves all information from the original JSON structure.
Is my data secure?
Absolutely! All conversion happens entirely in your browser using JavaScript. No data is sent to any server, and nothing is stored. Your JSON data never leaves your device.
What's the difference between compression modes?
Normal: Balances readability and compression.
Ultra-Compact: Maximum token savings, minimal spacing.
Pretty: More readable with spacing, moderate compression.
⭐ What Users Say
Join developers worldwide who are saving tokens with TOON
"This tool saved me hundreds of dollars in API costs! Converting my JSON to TOON reduced my prompt tokens by 65%. Absolutely essential for anyone working with LLMs."
"Perfect for prompt engineering! I can now include much larger datasets in my prompts without hitting token limits. The schema-aware mode is brilliant."
"Simple, fast, and incredibly effective. The real-time token counter helps me optimize on the fly. Privacy-first approach is a huge plus!"
Based on 1,234+ developer reviews
Trusted by AI developers worldwide
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