mermaid-diagrams
Text-based software diagrams for domain modeling, system architecture, data flows, and process visualization.
- Supports 9+ diagram types including class diagrams, sequence diagrams, flowcharts, entity relationship diagrams, C4 architecture diagrams, state machines, git graphs, and charts
- All diagrams defined as plain text with version-controllable
.mmdfiles; native rendering in GitHub, GitLab, VS Code, Notion, and Obsidian - Includes detailed references for each diagram type covering syntax, relationships, cardinality, participants, decision logic, and styling options
- Configurable themes, layout engines, and export options via Mermaid Live Editor, CLI, or Docker for PNG/SVG output
Mermaid Diagramming
Create professional software diagrams using Mermaid's text-based syntax. Mermaid renders diagrams from simple text definitions, making diagrams version-controllable, easy to update, and maintainable alongside code.
Core Syntax Structure
All Mermaid diagrams follow this pattern:
diagramType
definition content
Key principles:
- First line declares diagram type (e.g.,
classDiagram,sequenceDiagram,flowchart) - Use
%%for comments - Line breaks and indentation improve readability but aren't required
- Unknown words break diagrams; parameters fail silently
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