JSON to TOON Converter
Convert JSON to TOON format instantly and reduce LLM token usage by 30-60%. Lower GPT-4 and Claude API costs with our free, secure, browser-based converter — no signup, no data collection.
Why Use JSON to TOON Converter?
Save money on LLM API costs, protect your privacy, and optimize your AI workflows with the most efficient data format for ChatGPT, Claude, and other language models.
Reduce Tokens by 30-60%
TOON format eliminates redundant JSON syntax like brackets, braces, and repeated keys — cutting token usage by up to 60% based on official benchmarks.
Lower LLM API Costs
Save significantly on GPT-4, Claude, Gemini, and other LLM API costs. With 46% fewer tokens on average, you'll see immediate cost savings on every API call.
Completely Free Forever
No account required, no credit card, no limits. Convert unlimited JSON to TOON anytime, anywhere — 100% free forever.
Your Data Never Leaves Your Device
All conversion happens locally in your browser. Zero data transmission, zero servers, zero tracking. Your JSON stays private, guaranteed.
Instant Conversion in Milliseconds
Convert even large JSON files in under 100ms. Real-time processing with immediate results — no waiting, no delays.
JSON ↔ TOON Both Ways
Convert JSON to TOON for LLM prompts, then convert back to JSON when needed. Lossless conversion preserves your data structure perfectly.
What is TOON Format?
Token-Oriented Object Notation: A revolutionary data format that reduces LLM token usage by 30-60% and slashes your API costs
TOON (Token-Oriented Object Notation) is a compact data format specifically designed for Large Language Models. By eliminating JSON's repetitive keys, excessive punctuation, and tokenization inefficiencies, TOON delivers massive token savings while maintaining perfect data clarity.
The Problem with JSON
While JSON excels at data interchange, it's highly inefficient for LLMs due to:
Array keys repeat for every item, wasting tokens:
{"id": 1, "name": "Alice"}{"id": 2, "name": "Bob"}→ "id" and "name" appear twice unnecessarily
Brackets, braces, quotes, and commas create massive token overhead
Pretty-printed indentation and newlines increase file size significantly
LLM tokenizers split punctuation into separate tokens, amplifying the inefficiency
⚠️ Result: JSON can double your token count for structured data like user lists, catalogs, and analytics
When Should You Use TOON?
Choose the right format for your use case
Use TOON For
- Uniform Arrays of Objects
User lists, product catalogs, analytics data, API responses with consistent structure
- Large Datasets
The more rows you have, the greater the savings. 100-item arrays can save thousands of tokens
- LLM Prompts & Context
Passing data in ChatGPT, Claude, or Gemini prompts. Maximize context window efficiency
- Data Pipelines & ETL
Structured data extraction, transformation, and loading for LLM processing
Stick with JSON
- Deeply Nested Structures
Complex hierarchies and deep nesting reduce TOON's efficiency benefits
- Non-Uniform Data
Objects with varying fields and inconsistent schemas don't compress well
- System Interoperability
When integrating with systems that strictly require standard JSON format
- Small Datasets
Tiny objects with fewer than 10 items show minimal token savings
Latest from Our Blog
Learn about TOON format, LLM optimization, and token reduction strategies
What is TOON and Why It Matters for AI Developers
Discover TOON (Token-Oriented Object Notation), the revolutionary data format designed to reduce LLM token consumption by up to 60% and slash your AI API costs.
The Complete JSON to TOON Conversion Guide
Learn how to convert JSON to TOON format with practical examples, best practices, and step-by-step instructions to reduce your LLM token usage.
JSON vs TOON for Large Language Models
An in-depth comparison of JSON and TOON data formats for LLM applications, analyzing token efficiency, performance, and when to use each format.
Ready to Reduce Your
LLM Costs by 60%?
Join thousands of developers optimizing their AI workflows with TOON format. Start converting now — it's completely free.