DomainLang

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DomainLangDomain-Driven Design, as code

Define, validate, and evolve your DDD models in version-controlled text files — with IDE intelligence and AI-powered analysis.

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What is DomainLang?
DomainLang
🏗️

Model your architecture

Express domains, bounded contexts, context maps, teams, and ubiquitous language in a clean, readable syntax designed for DDD practitioners.

🔍

Catch modeling issues early

Real-time validation in your editor catches inconsistencies, missing definitions, and common DDD anti-patterns as you type.

🤖

AI-powered analysis

Ask GitHub Copilot or Claude about your domain model directly in VS Code. AI agents read live model data and give accurate, context-aware answers.

📦

Version control your models

Plain text .dlang files live in your repo — easy to review in pull requests, track changes over time, and keep in sync with the code.

🛠️

Full IDE experience

VS Code extension with syntax highlighting, code completion, hover docs, go-to-definition, and formatting — the same experience you expect for code.

🧩

Programmable and extensible

Query and analyze models with the Model Query SDK. Automate documentation, enforce governance, or build custom integrations.

🚧 Prerelease software

DomainLang is in active development and has not reached v1.0 yet. The language syntax and tooling may change. We welcome feedback and contributions — see the roadmap for planned features.

See it in action ​

dlang
Classification CoreDomain
Team SalesTeam

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

BoundedContext 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
}

Built for your workflow ​

Architects & tech leads Lightweight, reviewable DDD models that live in the codebase — not in wikis that go stale. Track architecture decisions alongside the code they govern.

Domain modelers & business experts A readable language for capturing strategic design, ubiquitous language, and team ownership. No programming experience required to read or contribute.

Developers & platform teams IDE feedback while evolving models. A programmable SDK for automation. AI agents that understand your domain model.

Explore further ​