- Paste or type your TOON content in the left editor
- The tool validates your TOON syntax and shows any errors
- Click the arrow button to convert to JSON format
- View the formatted JSON output with proper indentation
- Copy or download the JSON result for your applications
What is TOON format?
TOON (Token-Oriented Object Notation) is a compact data format designed to minimize tokens when sending data to LLMs. It uses array length markers [N], field headers {fields}, and tabular data rows to achieve CSV-like compactness while maintaining explicit structure.
Is the conversion lossless?
Yes, TOON to JSON conversion is completely lossless. All data types (strings, numbers, booleans, null, arrays, objects) are perfectly preserved. The round-trip decode(encode(x)) always equals the original data.
How do I read TOON syntax?
TOON uses several conventions: [N] declares array length, {field1,field2} declares field names for tabular data, indentation shows nesting (like YAML), and comma-separated values represent array rows. For example, 'users[2]{id,name}: 1,Alice 2,Bob' represents two user objects.
When would I need to convert TOON to JSON?
Convert TOON to JSON when you need to process LLM output programmatically, debug TOON data structures, or integrate with systems that require standard JSON. It's also useful for validating that your TOON encoding is correct.
Does TOON support nested objects?
Yes, TOON fully supports nested objects using YAML-style indentation. Nested structures are preserved exactly when converting between TOON and JSON formats.
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