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TOON Converter - JSON to TOON Format Converter

Free online TOON converter. Convert between JSON and TOON (Token-Oriented Object Notation) formats with real-time validation, syntax highlighting, and token efficiency analysis. Perfect for LLM optimization and data serialization. No registration required.

Input JSON

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Output TOON

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Options
Example Conversions

Click any example to load it into the input editor and see the conversion in action.

1. Simple Object (Key-Value Pairs)

{
  "id": 123,
  "name": "Ada",
  "active": true
}
id: 123
name: Ada
active: true

2. Nested Object (Indented Structure)

{
  "user": {
    "id": 123,
    "name": "Ada",
    "email": "ada@example.com"
  }
}
user:
  id: 123
  name: Ada
  email: ada@example.com

3. Primitive Array (Inline Format)

{
  "tags": ["admin", "ops", "dev"]
}
tags[3]: admin, ops, dev

4. Tabular Array (Uniform Objects)

{
  "users": [
    {"id": 1, "name": "Alice", "role": "admin"},
    {"id": 2, "name": "Bob", "role": "user"}
  ]
}
users[2]{id,name,role}:
1, Alice, admin
2, Bob, user

5. Mixed Array (List Format)

{
  "items": [1, {"a": 1}, "x"]
}
items[3]:
- 1
- a: 1
- x

6. Key Folding (Dotted Paths)

{
  "data": {
    "metadata": {
      "items": ["a", "b"]
    }
  }
}
data.metadata.items[2]: a, b

Note: Enable "Key Folding: Safe" option to collapse nested chains into dotted paths.

About TOON Format Converter

Our free online TOON converter is the easiest way to convert between JSON and TOON (Token-Oriented Object Notation) formats. Whether you're optimizing data for LLM applications, reducing token costs, or exploring efficient data serialization formats, this tool provides everything you need with real-time validation and comprehensive token analysis.

Why Use TOON Format?

TOON format offers significant advantages over traditional JSON, especially when working with large language models (LLMs) or token-sensitive applications. By using YAML-like indentation and CSV-style tabular layouts, TOON can reduce token usage by 20-40% compared to equivalent JSON data. This translates to lower API costs, faster processing, and more efficient data transmission.

Key Features of Our TOON Converter

  • Bidirectional Conversion: Convert from JSON to TOON or TOON to JSON seamlessly
  • Real-time Validation: Instant feedback on syntax errors and structural issues
  • Token Efficiency Analysis: See exactly how many tokens you save with TOON format
  • Syntax Highlighting: Monaco Editor integration for professional code editing experience
  • File Support: Upload JSON or TOON files up to 10MB for conversion
  • Multiple Delimiters: Choose between comma, tab, or pipe delimiters for array data
  • Key Folding: Collapse nested object chains into dotted paths for even more efficiency
  • Privacy First: All conversions happen in your browser - no data sent to servers
  • Free Forever: No registration, no limits, no hidden costs

Perfect For Developers

This TOON converter is ideal for developers working with AI applications, API optimization, data serialization, or anyone looking to reduce token costs in LLM-based systems. The intuitive interface makes it easy to experiment with TOON format and see the benefits immediately through our built-in token analysis.