JSON to TOON

Convert JSON to official TOON, compare tokens and decode back locally.

DelimiterSafe key foldingExpand paths

Input

Output

users[3]{id,name,role,active}:
  1,Ada Lovelace,admin,true
  2,Grace Hopper,user,false
  3,Katherine Johnson,analyst,true
meta:
  exportedAt: "2026-05-05T00:00:00.000Z"
  source: tools.junyo.dev

Characters427 → 194

Tokens150 → 75

Char savings54.6%

Token savings50%

Conversion, decode and token counting happen in your browser. JSON, TOON and values are never sent to analytics.

Details below

About this tool

Official TOON for more compact prompt data.

TOON is a token-oriented notation for the JSON data model. This tool uses the official @toon-format/toon package, strict decoding validation and delimiter/key folding options.

How to use

Paste JSON or TOON and compare output.

Choose the mode or use automatic detection.
Adjust delimiter, key folding or path expansion when needed.
Copy the output and compare characters/tokens before using it in prompts or docs.

FAQ

Frequently asked questions

Does TOON replace JSON?

No. TOON is useful as a compact, readable representation, especially for tabular arrays and LLM prompts.

Does round-trip preserve data?

Does tab save more tokens?

Is my JSON sent to a server?

Productivity

Official TOON for more compact prompt data.

Paste JSON or TOON and compare output.

Frequently asked questions

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