Documentation as Code vs Architecture as Code

Although Documentation as Code (DaC) and Architecture as Code (AaC) share similar principles—version control, automation, and treating artefacts as code—they serve fundamentally different purposes within the software development lifecycle. Understanding these differences is essential for organisations seeking to implement both practices effectively and avoid conflating their distinct roles.

Documentation as Code focuses on capturing and communicating knowledge about systems in a maintainable, version-controlled format. Architecture as Code, by contrast, defines the actual structure, relationships, and constraints of systems in executable or enforceable formats that can drive automation and validation. This chapter explores the key distinctions between these two disciplines and examines how the choice of tooling reflects their different objectives.

Documentation as Code treats documentation as a first-class artefact within the codebase. Its primary goal is to communicate how systems work, why certain decisions were made, and how teams should interact with the technology. Documentation answers questions such as:

Primary topics explored

1. Introduction
2. Purpose and Scope
3. Tooling Paradigms: Modelling Tools vs Diagram Tools
4. Key Differences: A Comparative Framework
5. The Relationship Between Documentation as Code and Architecture as Code
6. Practical Recommendations