About JSON to TOON Converter
Helping developers and AI practitioners optimize their LLM token usage and reduce API costs — one conversion at a time.
Making LLM Usage Affordable for Everyone
We provide a free, easy-to-use tool that reduces token consumption by 30-60% without sacrificing data clarity
We built jsontotoon.com to solve a simple but expensive problem: JSON is token-inefficient for Large Language Models.
Every time you pass JSON data to GPT-4, Claude, or other LLMs, you're paying for thousands of redundant characters — brackets, braces, repeated keys, and unnecessary whitespace. For developers making hundreds or thousands of API calls, these "invisible" tokens add up to real money.
What is TOON Format?
TOON (Token-Oriented Object Notation) is a revolutionary data format designed specifically to reduce LLM tokens and optimize AI API costs. Our JSON to TOON converter transforms your data into a compact, token-efficient format that cuts API costs by 30-60%.
Unlike traditional JSON, this TOON format converter eliminates unnecessary syntax overhead, repeated keys, and excessive punctuation — delivering massive token savings while maintaining perfect data clarity for GPT-4, Claude, Gemini, and all major LLMs.
Traditional JSON
Repetitive keys, excessive punctuation
{
"users": [
{"id": 1, "name": "Alice"},
{"id": 2, "name": "Bob"},
{"id": 3, "name": "Carol"}
]
}TOON Format
Compact, token-optimized
users: id name 1 Alice 2 Bob 3 Carol
Reduce LLM Tokens by 30-60%
Dramatically lower your API costs across GPT-4, Claude, Gemini, and all major LLM providers.
Maintain Data Integrity
Lossless conversion ensures perfect data accuracy. Fully reversible between JSON and TOON.
Human-Readable Format
Clean, YAML-like syntax that's easy to read and debug. Developer-friendly and intuitive.
Maximize Context Window
Fit more data within LLM context limits. Build more complex AI applications with less overhead.
Instant Conversion
Client-side processing means your data never leaves your browser. Fast, secure, and private.
Zero Learning Curve
Paste JSON, get TOON. No configuration, no installation. Just instant token optimization.
Why We Built jsontotoon.com
When we first learned about TOON format in late 2024, we immediately saw its potential to help developers save money on LLM API costs. But there was a problem: while TOON was well-specified and had great library support, there wasn't a simple, web-based converter that anyone could use instantly.
Our tool is built on four core beliefs:
Accessible to Everyone
Token optimization should be accessible to everyone — not just enterprises with big budgets
Privacy First
Privacy is non-negotiable — your data should stay on your device
Open Standards
Open standards benefit everyone — TOON is an open specification, and we support its adoption
Simple and Fast
Developer tools should be simple and fast — no account, no friction, just results
The result is jsontotoon.com — a fast, secure, free tool that helps developers optimize their LLM token usage in seconds.
Why Use Our JSON to TOON Converter?
Our converter is built for developers who need fast, secure, and accurate token optimization. No signup, no installation, no cost — just instant results.
100% Free Forever
No signup, no hidden fees, no limits. Unlimited conversions, completely free. Save money on tokens without spending a cent on tools.
Client-Side Processing
Your data never leaves your browser. All conversion happens locally on your device. Complete privacy and security guaranteed.
Instant Conversion
Real-time results as you type. No waiting, no queues, no delays. Lightning-fast conversion powered by efficient client-side processing.
No Installation Required
Works in any modern browser. No downloads, no dependencies, no setup. Just open, paste, and convert.
Accurate Token Counting
Real GPT-4 tokenizer integration shows exact token counts. See precise savings before and after conversion.
Bidirectional Conversion
Convert JSON to TOON or TOON back to JSON. Fully reversible, lossless conversion in both directions.
Start Optimizing Your LLM Token Usage Today
Ready to reduce your LLM API costs by 30-60%?
No signup, no installation, no cost — just better token efficiency.