TOON

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Tools and Playgrounds ​

Experiment with TOON format interactively using these tools for token comparison, format conversion, and validation.

Playground ​

The TOON Playground lets you convert JSON or YAML to TOON in real time, compare token counts, and share your experiments via URL.

CLI Tool ​

The official TOON CLI provides command-line conversion, token statistics, and all encoding/decoding features. See the CLI reference for full documentation.

bash
npx @toon-format/cli input.json --stats -o output.toon

Editor Support ​

VS Code ​

TOON Support – the official extension: syntax highlighting, also on Open VSX.

bash
code --install-extension toon-format.toon

TOON Language Support – a community extension that adds validation, conversion, and token analysis.

Tree-sitter Grammar ​

tree-sitter-toon – Grammar for Tree-sitter-compatible editors (Neovim, Helix, Emacs, Zed).

Neovim ​

toon.nvim – Lua-based plugin for Neovim.

Other Editors ​

Use YAML syntax highlighting as a close approximation. Most editors allow associating .toon files with YAML language mode.

Databases ​

ToonStore ​

ToonStore – Redis-compatible embedded database (Rust) that stores data in TOON format.

MCP ​

Tooner ​

Tooner – MCP proxy that converts JSON tool responses to TOON.