JSON to TOON Converter
Convert JSON to TOON format online. Transform JSON data to human-readable TOON configuration files. Free JSON to TOON converter with customizable options and instant results.
Why Use JSON to TOON for LLM Applications?
30-60% Token Reduction
Our JSON to TOON converter achieves proven token savings across all major LLM providers including OpenAI, Anthropic, and Google. Reduce your API costs significantly.
LLM-Optimized Format
TOON format is specifically designed for language models. The JSON to TOON converter creates output that LLMs parse more efficiently.
Human-Readable Output
Despite being optimized for machines, TOON format remains readable. The JSON to TOON converter produces clean, indented output.
Features
📋 Advanced TOON Conversion
- Convert JSON to token-efficient TOON format
- Real-time token count comparison
- Sort object keys for consistent output
- Automatic table format for uniform arrays
🤖 LLM Integration
- Reduce API costs for ChatGPT, Claude, Gemini
- Optimize prompts and context windows
- Lower latency with smaller payloads
- Download as .toon files for AI workflows
⚡ Developer Experience
- Real-time token savings calculation
- Privacy-focused: all processing client-side
- Mobile-responsive design
- Copy to clipboard for immediate use
Complete Guide to JSON to TOON Conversion
What is TOON (Token-Oriented Object Notation)?
TOON (Token-Oriented Object Notation) is a revolutionary data serialization format specifically designed to reduce token consumption in Large Language Model (LLM) applications. Unlike traditional JSON with its verbose bracket syntax, TOON uses indentation-based structure and table notation for arrays, achieving 30-60% token reduction while maintaining full data integrity and human readability.
The TOON format was created by the open-source community to address the growing costs of LLM API usage. By eliminating redundant syntax characters like {}, [], and excessive quotes, TOON creates more compact representations that LLMs can parse equally well—or better—than JSON. This JSON to TOON converter implements the official TOON specification from github.com/toon-format/spec.
How TOON Reduces LLM Token Consumption
TOON achieves dramatic token savings through several key innovations:
- Indentation-Based Structure: Eliminates braces
{}and brackets[], using meaningful whitespace instead - Table Notation for Arrays: Uniform arrays become CSV-style tables with
[count]{fields}:syntax, avoiding repeated key names - Minimal Quoting: Only quotes strings containing special characters, reducing unnecessary quote tokens
- Compact Key-Value Pairs: Simple
key: valuenotation without braces or commas between entries - Optimized for Tokenizers: Structure aligns with how GPT, Claude, and other LLMs tokenize text
When to Convert JSON to TOON Format
- LLM API Cost Reduction: Reduce costs for ChatGPT, Claude, Gemini, and other LLM APIs by 30-60%
- Prompt Engineering: Fit more data in context windows by using token-efficient TOON format
- AI Training Data: Optimize training datasets and fine-tuning data for language models
- RAG Systems: Store and retrieve more documents within token limits for Retrieval-Augmented Generation
- Agent Frameworks: Reduce token usage in LangChain, AutoGPT, and other AI agent frameworks
- API Responses: Convert JSON API responses to TOON before sending to LLMs for processing
- Configuration Files: Create human-readable configs that LLMs can understand with fewer tokens
- Data Serialization: Exchange data between systems where token efficiency matters
TOON vs JSON: Token Comparison Example
JSON (96 tokens)
{
"users": [
{"id": 1, "name": "Alice"},
{"id": 2, "name": "Bob"}
]
}
TOON (59 tokens - 39% reduction)
users[2]{id,name}:
1,Alice
2,Bob
Notice how TOON's table notation eliminates repeated keys and brackets, resulting in 37 fewer tokens for this simple example. The savings compound dramatically with larger datasets!