Paste JSON on the left and get compact TOON output on the right. Tune delimiter,
indentation and array length markers, then copy or download your result.
Token-lean format for LLM prompts
Built to run entirely in the browser
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JSON Input
Paste any valid JSON object or array.
Delimiter
Indentation
Array length marker
TOON Output
Optimised text format for structured data.
JSON tokens (approx)
0
TOON tokens (approx)
0
Estimated savings
0%
Live token-style estimate as you type
How this converter behaves
Objects become key: value lines, with indentation for nesting.
Arrays of primitives use key[length]: v1,v2,… with your chosen delimiter.
Uniform arrays of objects are rendered as compact tables with a header row.
All processing happens in the browser; nothing is sent to a server.
Tips for best savings
Use TOON for uniform tabular data: logs, product lists, user rows.
Deeply nested trees may not compress as aggressively as flat data.
Token numbers are approximate word-like counts; use your API’s
tokenizer if you need exact billing-grade figures.
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