About JSON to TOON Converter
We provide a free, fast, and reliable tool to convert JSON to Token-Oriented Object Notation (TOON), helping developers optimize their data for language models and reduce API costs.
Our Mission
As language models become increasingly central to modern applications, token efficiency has become a critical concern for developers. Our mission is to make Token-Oriented Object Notation (TOON) accessible to everyone, providing a simple, free tool that helps reduce LLM API costs by 30-60% through smarter data formatting.
What is TOON?
Token-Oriented Object Notation (TOON) is a compact, human-readable encoding of the JSON data model specifically designed for LLM prompts. It provides lossless serialization of the same objects, arrays, and primitives as JSON, but in a syntax that minimizes tokens and makes structure easy for models to follow.
TOON combines YAML's indentation-based structure for nested objects with a CSV-style tabular layout for uniform arrays, achieving significant token reduction while maintaining readability for both humans and AI models.
Key Benefits of TOON
💰 Cost Efficiency
Reduce token usage by 30-60% compared to standard JSON, directly lowering your LLM API costs.
📊 Better Structure
Tabular format for arrays makes data relationships clearer for both humans and AI.
🔄 Lossless Conversion
Perfect round-trip conversion ensures no data is lost between JSON and TOON formats.
⚡ Improved Accuracy
Explicit structure and field headers help LLMs parse and validate data more reliably.
Perfect For
- ✓AI Application Developers: Reduce costs when sending structured data to LLMs
- ✓Data Scientists: Optimize prompts containing datasets and tabular information
- ✓API Integrators: Efficiently format API responses for LLM processing
- ✓Researchers: Test and benchmark token-efficient data formats
Why We Built This Tool
While TOON specification exists with implementations in various programming languages (TypeScript, Python, Go, Rust), we noticed the lack of a simple, accessible online tool for quick conversions. Developers shouldn't need to install libraries or write code just to test TOON format or convert small datasets.
Our converter provides instant, browser-based conversion that works for everyone - from curious developers exploring TOON for the first time to experienced practitioners who need a quick way to format data on the go.
Open Source & Community
TOON is an open specification maintained by the community. To learn more about the format, contribute to the specification, or use TOON in your projects, visit:
Ready to Optimize Your Data?
Start converting your JSON to TOON format now and experience the benefits!
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