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Data Format Converter

Convert between JSON, TOON, and XML formats instantly. All conversions happen in your browser.

100% Private: Your data never leaves your browser. All processing is local.

Format Examples & Tips

JSON Format 

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

TOON Format (Token-Optimized) 

name: John
age: 30
hobbies[2]: reading,gaming

Saves ~40% tokens vs JSON for LLMs

XML Format 

<root>
  <name>John</name>
  <age>30</age>
  <hobbies>
    <item>reading</item>
    <item>gaming</item>
  </hobbies>
</root>

Why Use Our Data Format Converter?

  • TOON Format Support: First online converter with TOON (Token-Oriented Object Notation) - perfect for optimizing LLM prompts and reducing API costs by up to 40%.
  • 100% Client-Side: All conversions happen in your browser. No uploads, no servers, complete privacy guaranteed.
  • No File Size Limits: Convert massive datasets without restrictions - JSON files up to 100MB+ handled instantly.
  • Free Forever: No registration, no premium plans, unlimited conversions completely free.

Common Use Cases

  • LLM Optimization: Convert JSON to TOON format to save tokens when using GPT-4, Claude, or other AI models.
  • API Development: Convert between JSON and XML for REST/SOAP API integration and testing.
  • Data Exchange: Transform data between JSON, TOON, and XML for seamless integration.
  • Database Migration: Convert between different data formats when migrating between systems or databases.

Data Format Comparison

Format Best For Token Efficiency Human Readable
JSON APIs, Web Apps, Configuration ⭐⭐⭐ ⭐⭐⭐⭐
TOON LLM Prompts, Token Optimization ⭐⭐⭐⭐⭐ ⭐⭐⭐⭐
XML Enterprise Systems, SOAP APIs ⭐⭐ ⭐⭐⭐

Frequently Asked Questions

What is TOON format?

TOON (Token-Oriented Object Notation) is a compact data format designed to minimize token usage for Large Language Models (LLMs). It can reduce JSON token count by approximately 40%, making it perfect for optimizing AI prompts and reducing API costs when working with GPT-4, Claude, or other language models.

Is my data safe when converting?

Absolutely! All conversions are performed entirely in your browser using JavaScript. Your data never leaves your device, never touches our servers, and is never stored or logged anywhere. This ensures complete privacy and security for sensitive data.

Can I convert large JSON files?

Yes! Our converter can handle large JSON files without size restrictions. Convert between JSON, TOON, and XML formats with files up to 100MB+ processed instantly in your browser.

How do I convert XML to JSON?

Simply paste your XML data into the input field, select "XML → JSON" from the conversion options, and click Convert. The tool will parse your XML and generate properly formatted JSON with preserved structure and data types.

Does this work offline?

After the initial page load, the conversion functionality works offline since all processing happens in your browser. However, you'll need an internet connection to access the page initially and load the required JavaScript libraries.

Related Tools: JSON to XML converter, XML to JSON converter, JSON formatter, TOON converter, data format transformer, token optimizer for AI, LLM prompt optimizer, free online data converter, JSON beautifier, TOON to JSON