Data Format Converter

Convert between JSON, TOON, and XML formats

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100% Private: All processing happens locally in your browser.

Format Examples

JSON 

{
  "name": "John",
  "age": 30,
  "hobbies": ["reading"]
}

TOON (Token-Optimized) 

name: John
age: 30
hobbies[1]: reading

~40% fewer tokens for LLMs

XML 

<root>
  <name>John</name>
  <age>30</age>
</root>

Why Use This Converter?

  • TOON Format: Optimize LLM prompts, reduce API costs by up to 40%.
  • 100% Client-Side: No uploads, complete privacy guaranteed.
  • No Limits: Handle large datasets without restrictions.

Common Use Cases

  • LLM Optimization: Convert JSON to TOON for GPT-4, Claude.
  • API Development: Convert between JSON and XML for REST/SOAP.
  • Data Migration: Transform formats between systems.

Data Format Comparison

Format Best For Token Efficiency Readability
JSON APIs, Web Apps, Config ⭐⭐⭐ ⭐⭐⭐⭐
TOON LLM Prompts, Token Optimization ⭐⭐⭐⭐⭐ ⭐⭐⭐⭐
XML Enterprise, SOAP APIs ⭐⭐ ⭐⭐⭐

Frequently Asked Questions

What is TOON format?

Token-Oriented Object Notation - a compact format that reduces token count by ~40% for LLMs like GPT-4 and Claude.

Is my data safe?

All conversions happen in your browser. Data never touches our servers.

Can I convert large files?

Yes! No size restrictions - files up to 100MB+ are handled instantly in your browser.

Does it work offline?

After initial page load, the converter works offline since all processing is client-side.

Related: JSON to XML, XML to JSON, JSON formatter, TOON converter, token optimizer, LLM prompt optimizer