A small DSL for Domain-Driven Design (DDD) architecture models, with first-class IDE support.

Use DomainLang to keep domains, bounded contexts, ownership, terminology, and context maps close to the codebase (and easy to review in pull requests).

1. Install the VS Code extension: https://marketplace.visualstudio.com/items?itemName=DomainLang.vscode-domainlang
2. Create a .dlang file and start modeling
3. Read the documentation: https://domainlang.net/guide/getting-started

Classification CoreDomain
Team SalesTeam

Domain Sales {
    description: "Revenue generation and customer acquisition"
    vision: "Make it easy to buy"
}

bc Orders for Sales as CoreDomain by SalesTeam {
    description: "Order lifecycle and orchestration"

    terminology {
        term Order: "A customer's request to purchase"
    }
}

ContextMap SalesLandscape {
    contains Orders
}

• Architects and tech leads who want lightweight, reviewable DDD models
• Teams doing DDD who need a shared ubiquitous language in the repo
• Developers who want IDE feedback while evolving architecture

• A DDD-aligned language for architecture models
• VS Code support (syntax highlighting, completion, hover, go-to-definition)
• Validation to catch common modeling issues early
• Model Query SDK for analysis and automation

Full documentation is available at https://domainlang.net:

• Getting Started — Build your first model
• Language Reference — Complete syntax and semantics
• Quick Reference — Syntax cheat sheet
• Examples — Real-world model examples

Development uses Node.js 20+ (Volta is configured).

cd dsl/domain-lang
npm install
npm run langium:generate
npm run build
npm test

See dsl/domain-lang/README.md for workspace commands and package layout.

Ideas, bug reports, and pull requests are welcome!

• 💬 Discussions — Ask questions and share ideas
• 🐛 Issues — Report bugs or propose features
• 📖 Contributing Guide — Get started contributing

Before submitting code, run npm test and npm run lint from dsl/domain-lang/.

Apache 2.0 (see LICENSE)

This project is sponsored by thinkability