TOON to JSON Converter

Example: TOON input and real JSON output

The output below was generated by the same conversion code the converter uses, run on this sample when the page was built.

employees[4]{id,name,dept,salary,remote}:
  1,Alice Chen,Engineering,128000,true
  2,Bob Okafor,Sales,86000,false
  3,Carla Diaz,Engineering,119000,true
  4,Dan Weiss,Support,64000,false

{
  "employees": [
    {
      "id": 1,
      "name": "Alice Chen",
      "dept": "Engineering",
      "salary": 128000,
      "remote": true
    },
    {
      "id": 2,
      "name": "Bob Okafor",
      "dept": "Sales",
      "salary": 86000,
      "remote": false
    },
    {
      "id": 3,
      "name": "Carla Diaz",
      "dept": "Engineering",
      "salary": 119000,
      "remote": true
    },
    {
      "id": 4,
      "name": "Dan Weiss",
      "dept": "Support",
      "salary": 64000,
      "remote": false
    }
  ]
}

JSON output is 186% larger than the TOON input. The same data is 324 characters as minified JSON and 532 as pretty-printed JSON. Sizes are character counts, not tokens: token counts depend on the model's tokenizer (see the tokenizer comparison). Across larger datasets, TOON averages about 43% fewer tokens than JSON (42.6%) according to the official TOON benchmark.

TOON to JSON: what changes

• TOON decodes to exactly the JSON it was encoded from: same values, same types, same key order. Use this direction to validate model output written in TOON or to feed it back into code.
• Reading TOON: TOON is strict about structure: the [N] in an array header must match the number of rows, and each row needs exactly as many values as the {field} list. Hand-edited TOON that breaks either rule fails to decode.
• Writing JSON: Output is pretty-printed with your chosen indentation. JSON is the safest target when the data goes into code, an API, or another tool.

Why Convert TOON to JSON?

Use JSON when you need maximum compatibility with other systems, APIs, or programming languages. It's the de facto standard for web APIs and data exchange.