JSON ↔ TOON Converter
Convert JSON to TOON (Token-Oriented Object Notation) and back. TOON is a compact, human-readable format that uses ~40% fewer tokens than JSON — ideal for LLM prompts and structured AI pipelines.
What is TOON?
TOON (Token‑Oriented Object Notation) is a compact, human‑readable encoding of the JSON data model. It uses YAML-style indentation for nested objects and CSV-style rows for uniform arrays. When applied to large, repetitive data sets—especially lists of similar objects—TOON can significantly reduce the number of characters compared to formatted JSON, although actual savings vary depending on the structure of the data. It is designed as a drop‑in alternative to JSON for LLM prompts, keeping the structure clear for models to follow while helping to shorten prompt length and reduce token usage. Learn more at the official TOON project on GitHub.
JSON and TOON data is processed locally in your browser and never sent to a server.