TOON for Visual Studio Code

Highlights TOON (Token-Oriented Object Notation) in .toon files. TOON is a compact, indentation-based encoding of the JSON data model for LLM input.

Installation

code --install-extension toon-format.toon

VSCodium and other editors that use Open VSX install it from there.

Usage

Open any .toon file, such as:

users[2]{id,name,role}:
  1,Ada,admin
  2,Bob,user

The grammar scopes:

Keys, array headers with their length and delimiter, and field lists – including nested field groups and keyed tabular headers
Numbers, true, false, null, empty arrays, and unquoted and quoted strings, with invalid escape sequences flagged
Delimiters in inline arrays and rows, list item markers, and full-line # comments

Folding follows indentation, and pressing Enter after a line ending in : indents the next one.

Specification

Targets TOON spec v4.1, and the test suite tokenizes the spec's decode fixtures.

Resources

Specification: SPEC.md – Normative rules and conformance checklists
Format Overview: toonformat.dev – Every form with examples
Other Implementations: toonformat.dev – TOON in other languages

Contributing

See CONTRIBUTING.md for the development setup and pull request guidelines.

Token-Oriented Object Notation (TOON) Support

TOON