TOON Output
Token-Oriented Object Notation (TOON)
Convert JSON to TOON format - optimized for LLM prompts with ~40% fewer tokens
Try the JSON to TOON converter with sample data
Free JSON to TOON Converter - Convert JSON to Token-Optimized Format
Convert JSON to TOON (Token-Oriented Object Notation) for LLM Efficiency
JSON to TOON
Convert JSON to Token-Oriented Object Notation - optimized for LLM prompts with 30-60% fewer tokens
What is TOON?
Token-Oriented Object Notation (TOON) is a compact data format designed specifically for Large Language Models, combining the readability of YAML with the efficiency of CSV-style arrays.
✨Key Benefits
📊Token Efficient
Uses 30-60% fewer tokens than standard JSON, reducing API costs significantly
🔁JSON Compatible
Lossless round-trips with JSON data model - convert back anytime
🛤️LLM Friendly
73.9% retrieval accuracy vs JSON's 69.7% - optimized for AI parsing
📐Minimal Syntax
Uses indentation instead of braces, minimizes quoting for cleaner output
🧺Tabular Arrays
Uniform arrays collapse into compact tables - perfect for repeated structures
Try it via CLI:npx @toon-format/cli *.json
Learn more at toonformat.dev
Official TOON format specification and documentation
JSON vs TOON: Complete Format Comparison
Understand the key differences between JSON and TOON formats to choose the right one for your LLM applications
📊LLM Benchmark Results
| Format | Accuracy | Token Count | Token Savings |
|---|---|---|---|
| TOON | 73.9% | 2,744 | 39.6% |
| JSON | 69.7% | 4,545 | — |
* Benchmark based on GPT-4 Turbo (gpt-4-1106-preview) testing on diverse datasets
⚡Key Differences
JSON
- ✓Universal compatibility
- ✓Native browser support
- ✗Higher token count
- ✗Verbose syntax with quotes
TOONRecommended
- ✓30-60% fewer tokens
- ✓Higher LLM accuracy
- ✓Cleaner, quote-free syntax
- ✓Lossless JSON conversion
🎯When to Use Each Format
Use JSON when:
- Building web APIs and services
- Storing configuration files
- Cross-platform data exchange
- Browser-based applications
Use TOON when:
- Embedding data in LLM prompts
- Optimizing for token costs
- Maximizing context window usage
- Working with AI/ML pipelines
💡 Pro Tip: Convert your JSON to TOON above and save 30-60% on token costs for your LLM applications
JSON to TOON FAQs
Get answers to common questions about converting JSON to TOON
TOON (Token-Oriented Object Notation) is a compact data format optimized for LLM prompts. It uses ~40% fewer tokens than JSON while maintaining the same data model.
TOON is ideal when working with LLMs where token count matters. It reduces costs and allows more data in context windows while remaining human-readable.
Yes! TOON supports the same data types as JSON (objects, arrays, strings, numbers, booleans, null) and can be converted back to JSON losslessly.
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