Create diagrams and visualizations using Mermaid.js v11 syntax. Use when generating flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, user journeys, timelines, architecture diagrams, or any of 24+ diagram types. Supports JavaScript API integration, CLI rendering to SVG/PNG/PDF, theming, configuration, and accessibility features. Essential for documentation, technical diagrams, project planning, system architecture, and visual communication.
Create text-based diagrams using Mermaid.js v11 declarative syntax. Convert code to SVG/PNG/PDF via CLI or render in browsers/markdown files.
Basic Diagram Structure:
{diagram-type}
{diagram-content}
Common Diagram Types:
flowchart - Process flows, decision treessequenceDiagram - Actor interactions, API flowsclassDiagram - OOP structures, data modelsstateDiagram - State machines, workflowserDiagram - Database relationshipsgantt - Project timelinesjourney - User experience flowsSee references/diagram-types.md for all 24+ types with syntax.
Inline Markdown Code Blocks:
```mermaid
flowchart TD
A[Start] --> B{Decision}
B -->|Yes| C[Action]
B -->|No| D[End]
```
Configuration via Frontmatter:
```mermaid
---