Mermaidjs

Skill ashishgoswami01/claude-skill-manager/community-skills/mermaidjs

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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.

SKILL.md

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Mermaid.js v11

Overview

Create text-based diagrams using Mermaid.js v11 declarative syntax. Convert code to SVG/PNG/PDF via CLI or render in browsers/markdown files.

Quick Start

Basic Diagram Structure:

{diagram-type}
  {diagram-content}

Common Diagram Types:

flowchart - Process flows, decision trees
sequenceDiagram - Actor interactions, API flows
classDiagram - OOP structures, data models
stateDiagram - State machines, workflows
erDiagram - Database relationships
gantt - Project timelines
journey - User experience flows

See references/diagram-types.md for all 24+ types with syntax.

Creating Diagrams

Inline Markdown Code Blocks:

```mermaid
flowchart TD
    A[Start] --> B{Decision}
    B -->|Yes| C[Action]
    B -->|No| D[End]
```

Configuration via Frontmatter:

```mermaid
---
theme: dark
---
flowchart LR
    A --> B
```

Comments: Use %% prefix for single-line comments.

CLI Usage

Convert .mmd files to images:

# Installation
npm install -g @mermaid-js/mermaid-cli

# Basic conversion
mmdc -i diagram.mmd -o diagram.svg

# With theme and background
mmdc -i input.mmd -o output.png -t dark -b transparent

# Custom styling
mmdc -i diagram.mmd --cssFile style.css -o output.svg

See references/cli-usage.md for Docker, batch processing, and advanced workflows.

JavaScript Integration

HTML Embedding:

<pre class="mermaid">
  flowchart TD
    A[Client] --> B[Server]
</pre>
<script src="https://cdn.jsdelivr.net/npm/mermaid@latest/dist/mermaid.min.js"></script>
<script>mermaid.initialize({ startOnLoad: true });</script>

See references/integration.md for Node.js API and advanced integration patterns.

Configuration & Theming

Common Options:

theme: "default", "dark", "forest", "neutral", "base"
look: "classic", "handDrawn"
fontFamily: Custom font specification
securityLevel: "strict", "loose", "antiscript"

See references/configuration.md for complete config options, theming, and customization.

Practical Patterns

Load references/examples.md for:

Architecture diagrams
API documentation flows
Database schemas
Project timelines
State machines
User journey maps

Resources

references/diagram-types.md - Syntax for all 24+ diagram types
references/configuration.md - Config, theming, accessibility
references/cli-usage.md - CLI commands and workflows
references/integration.md - JavaScript API and embedding
references/examples.md - Practical patterns and use cases