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C4 architectural modeling for documenting software architecture. Use when creating architecture diagrams, planning new systems, communicating with stakeholders, or conducting architecture reviews.
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| name | c4-modeling |
| description | C4 architectural modeling for documenting software architecture. Use when creating architecture diagrams, planning new systems, communicating with stakeholders, or conducting architecture reviews. |
Create hierarchical architecture diagrams at four abstraction levels using the C4 model and Mermaid syntax.
| Variable | Default | Description |
|---|---|---|
| DEFAULT_LEVEL | context | Start with context, container, component, or code |
| OUTPUT_FORMAT | mermaid | mermaid, structurizr, plantuml |
| INCLUDE_LEGEND | true | Add legend to diagrams |
MANDATORY - Follow the Workflow steps below when creating C4 diagrams.
If you're about to:
STOP -> Check the appropriate level guidelines in reference/level-guidelines.md -> Then proceed
| Level | Name | Purpose | Audience |
|---|---|---|---|
| 1 | Context | System in environment | Everyone |
| 2 | Container | Major components | Technical stakeholders |
| 3 | Component | Internal structure | Developers |
| 4 | Code | Implementation | Developers (sparingly) |
Show: System, users, external systems Hide: Internal details, databases, technology
Show: Applications, APIs, databases, queues Hide: Internal structure, classes
Show: Modules, services, repositories Hide: Individual classes, functions
Show: Classes, interfaces, key abstractions Use: Only for complex/critical areas
See reference/level-guidelines.md for detailed guidance.
See reference/mermaid-syntax.md for Mermaid C4 syntax.
C4Context
title System Context Diagram
Person(user, "User", "Description")
System(system, "System", "Description")
System_Ext(ext, "External", "Description")
Rel(user, system, "Uses")
C4Container
title Container Diagram
Container(web, "Web App", "React", "UI")
Container(api, "API", "Node.js", "Backend")
ContainerDb(db, "Database", "PostgreSQL", "Storage")
Rel(web, api, "Calls", "REST")
See reference/mermaid-syntax.md for complete syntax reference.
Diagrams should include: