JSON to TOON Converter
Convert JSON to TOON (Token-Oriented Object Notation) - A token-efficient format for LLMs
JSON Input
TOON Output
What is JSON to TOON Converter?
Need to convert your JSON (JavaScript Object Notation) data to TOON (Token-Oriented Object Notation)? This tool does that instantly. TOON is a token-efficient format designed for LLMs that reduces token usage by 30-60% compared to JSON while maintaining perfect data integrity.
According to the TOON documentation, TOON eliminates redundant JSON syntax like brackets, braces, and repeated keys. This makes it perfect for LLM applications where token costs matter. Our converter analyzes your JSON structure and generates optimized TOON format automatically.
Everything happens in your browser – your data stays private. Convert, download, and use your TOON right away. You can also format your JSON first using our JSON Formatter or validate it with our JSON Validator.
What Makes This Tool Different
Token Savings
Reduce token usage by 30-60% compared to JSON. Perfect for LLM applications where every token counts and costs add up quickly.
Lossless Conversion
Every piece of data is preserved. Arrays, objects, strings, numbers, booleans, null values – everything converts perfectly from JSON to TOON.
Instant Processing
Conversion happens in milliseconds. Paste your JSON, and get optimized TOON instantly. No waiting, no server delays – pure browser-side processing.
Smart Formatting
TOON uses intelligent formatting – tabular data becomes compact rows, nested structures use indentation, and arrays are optimized for readability.
File Upload Support
Got a JSON file? Just upload it. Works with .json and .txt files. No need to copy-paste – just drag and drop or click upload.
Download TOON
One click to download your converted TOON as a .toon file. Perfect for saving, sharing, or using with LLM applications.
How It Works
Paste or Upload JSON
Paste your JSON data into the left editor, or click "Upload" to load a file. You can also click "Sample" to see example JSON. The tool accepts any valid JSON structure – objects, arrays, nested data.
Automatic Conversion
As soon as you paste, the converter processes your JSON and displays the optimized TOON format on the right. The conversion is instant and preserves all your data structure, types, and values perfectly.
Copy or Download
Click "Copy" to copy the TOON to your clipboard, or "Download" to save it as a .toon file. The TOON format is optimized for LLM token efficiency while remaining human-readable.
When You'd Actually Use This
LLM Applications
Working with Large Language Models? Convert your JSON data to TOON to reduce token usage by 30-60%. This significantly lowers API costs while maintaining data integrity.
API Responses
Sending data to LLMs via APIs? TOON format reduces payload size and token costs. Perfect for optimizing API responses before sending to ChatGPT, Claude, or other LLMs.
Database Records
Exporting database records for LLM processing? TOON's tabular format is perfect for uniform record sets. Convert JSON exports to TOON for efficient LLM consumption.
Time-Series Data
Working with analytics, metrics, or logs? TOON's compact format is ideal for time-series data with consistent fields. Reduce token costs when processing large datasets with LLMs.
Common Questions
Is my JSON data stored?
No. All conversion happens in your browser using the @toon-format/toon library. Your data never leaves your computer.
What JSON formats are supported?
We support all valid JSON according to the ECMA-404 standard. Objects, arrays, nested structures, strings, numbers, booleans, null – everything standard JSON supports.
Can I convert invalid JSON?
No. The converter validates your JSON first. If it's invalid, you'll see an error message. Fix the syntax error, then convert again. Use our JSON Validator to check your JSON first.
Is the conversion lossless?
Yes! JSON to TOON conversion is 100% lossless. All data types, structures, and values are preserved exactly. You can convert back to JSON anytime using our TOON to JSON converter.
How much token savings can I expect?
Token savings vary by data structure, but typically range from 30-60%. Tabular data with repeated keys sees the highest savings, while deeply nested objects see less reduction but still benefit.
Can LLMs understand TOON format?
Yes! TOON is designed to be LLM-friendly. Modern LLMs like GPT-4, Claude, and others can parse and understand TOON format just as well as JSON, but with significantly fewer tokens.
Other TOON Tools You Might Need
Converting JSON to TOON is just one TOON task. Here are other tools that work well together:
Want to learn more about TOON? Check out the official TOON Tools website or read the TOON documentation.