YON™ for Visual Studio Code
Syntax highlighting, snippets, and language support for YON™
Part of the YON™ toolchain — data, intent, and instructions in a single stream.

Website · Specification · Apache 2.0 · Trademark Policy · Brand Assets

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Features

Syntax Highlighting

Full TextMate grammar covering all YON v2.0 constructs:

• Document headers — @DOC declarations with metadata attributes
• Sections — @SEC with name, parent, and attributes
• Tags — @NOTE, @RULE, @STEP, @MAP, @INTENT, and all standard tags
• Typed fields — count:int=42, active:bool=true, ratio:float=3.14
• Structured values — strings, lists [a, b, c], maps ["key"->"value"], references §ref
• Comments — line # ... and inline

Embedded Language Blocks

70+ languages highlighted inside @BEGIN/@END blocks:

@BEGIN lang=typescript
const greeting: string = "Hello, YON";
@END

Supported: TypeScript, JavaScript, JSON, Python, Rust, Go, Java, C/C++, C#, Ruby, PHP, SQL, YAML, TOML, Markdown, HTML, CSS, Shell, PowerShell, Dockerfile, Terraform, GraphQL, Protocol Buffers, Prisma, and more.

Snippets

Quickly scaffold YON documents with built-in snippets for common patterns.

File Icon

.yon files display a dedicated icon in the VS Code explorer.

Language Configuration

• Comment toggling (Ctrl+/)
• Bracket matching and auto-closing
• Folding on @SEC, @BEGIN/@END blocks

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What is YON?

YON (YounndAI Object Notation) is a structured data format that bridges human readability with machine precision. It's designed for:

• AI agent instructions — structured prompts, tool definitions, and workflows
• Configuration — type-safe settings with validation semantics
• Domain modeling — schemas, rules, and cross-references
• Documentation — technical specs that compile into executable artifacts

Learn more at yon.younndai.com.

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Requirements

• Visual Studio Code 1.85.0 or later

Links

• YON Standard & Documentation
• Source Code
• YON Parser (npm)
• YounndAI

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License & Attribution

Apache-2.0. © 2026 MARLINK TRADING SRL (YounndAI). See LICENSE and NOTICE.

"YON" and "YounndAI" are trademarks of MARLINK TRADING SRL — see TRADEMARK.md.

Created by Alexandru Mareș.

Website: yon.younndai.com

Structure before scale. Harmony above all.

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Spec	YON v2.0
Author	Alexandru Mareș
Company	MARLINK TRADING SRL · YounndAI™
License	Apache 2.0 — © 2026 MARLINK TRADING SRL
Trademark	YounndAI™ Trademark Guidelines

Structure before scale.