JSON to TOON Converter

Convert JSON or YAML data objects into Token-Oriented Object Notation (TOON)—a compact human-readable format designed to reduce token consumption and API costs when passing data payloads into Large Language Models (LLMs like GPT-4, Claude, Gemini).

Why Use This Tool?

• LLM Prompt Optimization: Reduce token count by 30-50% when sending large JSON datasets to OpenAI GPT-4, Anthropic Claude, or Google Gemini.
• Lower API Costs: Minimizing prompt token overhead directly reduces LLM API billing expense.
• Improved Context Window Space: Fit more data records within LLM context window limits.

How to Use

1. Paste your JSON or YAML data payload into the input panel.
2. The converter parses the object structure and serializes it into compact TOON syntax.
3. Copy the TOON formatted text to use directly in your LLM prompt.

Real Working Example

Input Text:

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

Output Result:

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

Important Technical Details & Features

• Tabular Array Compression: Converts arrays of uniform JSON objects into a single header definition followed by value rows, stripping repetitive JSON key strings.
• Syntax Error Validation: Highlights invalid JSON/YAML input before attempting TOON conversion.
• Client-Side Speed: 100% browser-based conversion—your API data payloads remain totally private.

Related Text & Developer Utilities

• JSON Formatter: Beautify and validate JSON.
• JSON to YAML Converter: Convert JSON to YAML.
• CSV to JSON Converter: Convert CSV to JSON.