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Title: TOON | Token-Oriented Object Notation

Open Graph Title: TOON

X Title: TOON

Description: Token-Oriented Object Notation (TOON) – compact, human-readable serialization of JSON data for LLM prompts

Open Graph Description: Token-Oriented Object Notation (TOON) – compact, human-readable serialization of JSON data for LLM prompts

X Description: Token-Oriented Object Notation (TOON) – compact, human-readable serialization of JSON data for LLM prompts

Opengraph URL: https://toonformat.dev/

X: @jschopplich

Generator: VitePress v1.6.4

direct link

Domain: toonformat.dev

authorJohann Schopplich
og:typewebsite
og:imagehttps://toonformat.dev/og_v4.png
twitter:imagehttps://toonformat.dev/twitter_v4.png
twitter:creator@jschopplich
twitter:cardsummary_large_image

Links:

Skip to contenthttps://toonformat.dev/#VPContent
TOONhttps://toonformat.dev/
Playgroundhttps://toonformat.dev/playground.html
Getting Startedhttps://toonformat.dev/guide/getting-started.html
Format Overviewhttps://toonformat.dev/guide/format-overview.html
Using TOON with LLMshttps://toonformat.dev/guide/llm-prompts.html
Benchmarkshttps://toonformat.dev/guide/benchmarks.html
CLIhttps://toonformat.dev/cli/
APIhttps://toonformat.dev/reference/api.html
Syntax Cheatsheethttps://toonformat.dev/reference/syntax-cheatsheet.html
Specificationhttps://toonformat.dev/reference/spec.html
Efficiency Formalizationhttps://toonformat.dev/reference/efficiency-formalization.html
Tools & Playgroundshttps://toonformat.dev/ecosystem/tools-and-playgrounds.html
Implementationshttps://toonformat.dev/ecosystem/implementations.html
Release Noteshttps://github.com/toon-format/toon/releases
https://github.com/toon-format/toon
https://github.com/toon-format/toon
What is TOON?https://toonformat.dev/guide/getting-started.html
New in v4https://toonformat.dev/guide/whats-new-in-v4.html
Benchmarkshttps://toonformat.dev/guide/benchmarks.html
Playgroundhttps://toonformat.dev/playground.html
CLIhttps://toonformat.dev/cli/
📊Token-Efficient & AccurateTOON matches JSON's retrieval accuracy (72.2% vs 71.4%) while using 42.6% fewer tokens.https://toonformat.dev/guide/benchmarks.html
🔁JSON Data ModelEncodes the same objects, arrays, and primitives as JSON with deterministic, lossless round-trips.https://toonformat.dev/guide/format-overview.html
🛤️LLM-Friendly Guardrails[N] declares how many rows, {fields} how wide – so truncated or malformed output can't slip through.https://toonformat.dev/guide/format-overview.html#array-headers
📐Minimal SyntaxUses indentation instead of braces and minimizes quoting, giving YAML-like readability with CSV-style compactness.https://toonformat.dev/guide/format-overview.html#quoting-and-types
🧺Tabular FormsUniform objects – in an array or under keys – declare the field list once, then stream one row each.https://toonformat.dev/guide/format-overview.html#the-four-forms
🌐Multi-Language EcosystemOfficial implementations, plus dozens of community ports, all targeting one spec with a shared conformance test suite.https://toonformat.dev/ecosystem/implementations.html
MIT Licensehttps://opensource.org/licenses/MIT
Johann Schopplichhttps://johannschopplich.com

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