JSON to TOON Converter
Convert JSON to TOON format (primary) or YAML/TOML/XML. Reduce LLM token usage by 30-60% with TOON. Validate and format JSON data.
About Formats
A compact, human-readable format designed to optimize data exchange with Large Language Models (LLMs).
- 30-60% fewer tokens compared to JSON
- Optimized for LLM comprehension
- Perfect for database query results and API responses
- YAML: YAML Ain't Markup Language, popular for configuration files
- TOML: Tom's Obvious, Minimal Language, used in Rust/Python projects
- XML: Extensible Markup Language, a classic data format
JSON:
{
"name": "Alice",
"age": 30,
"city": "Boston"
}
TOON:
name: Alice
age: 30
city: BostonFrequently Asked Questions
Is my data secure?
Yes, all conversion happens locally in your browser. Your JSON data is never sent to our servers.
What happens if my JSON is invalid?
The tool will show an error message below the input box, helping you identify that the syntax is incorrect.
When should I use TOON?
TOON is best for uniform arrays of objects (like database query results), API responses with consistent fields, and when you need to reduce token usage for LLM prompts. It's not ideal for deeply nested structures or non-uniform data.
How does TOON reduce tokens?
TOON declares keys once for arrays of objects and streams values as rows. For example, an array of 100 user objects with the same fields will declare the fields once and list 100 rows, instead of repeating field names 100 times like JSON does.
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