mermaid-diagrams

Included with Lifetime

$97 forever

Proactively suggest diagrams when explaining complex systems. Triggers on diagrams, charts, visualizations, flowcharts, sequence diagrams, architecture diagrams, ER diagrams, state machines, Gantt charts, mindmaps, C4, class diagrams, git graphs. Use when user asks for visual representations of code, systems, processes, data structures, database schemas, workflows, or API flows. Generate Mermaid diagrams in markdown.

Backend & APIs

What this skill does


# Mermaid Diagrams

Generate diagrams in markdown that render in GitHub, GitLab, VS Code, Obsidian, Notion.

## Quick Start

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

## Quick Decision Tree

```
What to visualize?
├─ Process, algorithm, decision flow    → flowchart
├─ API calls, service interactions      → sequenceDiagram
├─ Database tables, relationships       → erDiagram
├─ OOP, type hierarchy, domain model    → classDiagram
├─ State machine, lifecycle             → stateDiagram-v2
├─ System architecture, services        → flowchart + subgraphs (or C4Context)
├─ Project timeline, sprints            → gantt
├─ User experience, pain points         → journey
├─ Git branches                         → gitGraph
├─ Data distribution                    → pie
└─ Priority matrix                      → quadrantChart
```

## Diagram Types

| Type | Declaration | Best For |
|------|-------------|----------|
| **Flowchart** | `flowchart LR/TB` | Processes, decisions, data flow |
| **Sequence** | `sequenceDiagram` | API flows, service calls |
| **ER** | `erDiagram` | Database schemas |
| **Class** | `classDiagram` | Types, domain models |
| **State** | `stateDiagram-v2` | State machines |
| **Gantt** | `gantt` | Project timelines |
| **Journey** | `journey` | User experience |
| **C4** | `C4Context` | System architecture |
| **Git** | `gitGraph` | Branch visualization |

## Common Patterns

### System Architecture

```mermaid
flowchart LR
    subgraph Client
        Browser & Mobile
    end
    subgraph Services
        API --> Auth & Core
    end
    subgraph Data
        DB[(PostgreSQL)]
    end
    Client --> API
    Core --> DB
```

### API Request Flow

```mermaid
sequenceDiagram
    autonumber
    Client->>+API: POST /orders
    API->>Auth: Validate
    Auth-->>API: OK
    API->>+DB: Insert
    DB-->>-API: ID
    API-->>-Client: 201 Created
```

### Database Schema

```mermaid
erDiagram
    USER ||--o{ ORDER : places
    ORDER ||--|{ LINE_ITEM : contains
    USER { uuid id PK; string email UK }
    ORDER { uuid id PK; uuid user_id FK }
```

### State Machine

```mermaid
stateDiagram-v2
    [*] --> Draft
    Draft --> Submitted : submit()
    Submitted --> Approved : approve()
    Submitted --> Rejected : reject()
    Approved --> [*]
```

## Syntax Quick Reference

### Flowchart Nodes

```
[Rectangle]  (Rounded)  {Diamond}  [(Database)]  [[Subroutine]]
((Circle))   >Asymmetric]   {{Hexagon}}
```

### Flowchart Edges

```
A --> B       # Arrow
A --- B       # Line
A -.-> B      # Dotted arrow
A ==> B       # Thick arrow
A -->|text| B # Labeled
```

### Sequence Arrows

```
->>   # Solid arrow (request)
-->>  # Dotted arrow (response)
-x    # X end (async)
-)    # Open arrow
```

### ER Cardinality

```
||--||   # One to one
||--o{   # One to many
}o--o{   # Many to many
```

## Best Practices

1. **Choose the right type** — Use decision tree above
2. **Keep focused** — One concept per diagram
3. **Use meaningful labels** — Not just A, B, C
4. **Direction matters** — `LR` for flows, `TB` for hierarchies
5. **Group with subgraphs** — Organize related nodes

## Reference Documentation

| File | Purpose |
|------|---------|
| [references/FLOWCHARTS.md](references/FLOWCHARTS.md) | Nodes, edges, subgraphs, styling |
| [references/SEQUENCE.md](references/SEQUENCE.md) | Participants, messages, activation |
| [references/CLASS-ER.md](references/CLASS-ER.md) | Classes, ER diagrams, relationships |
| [references/STATE-JOURNEY.md](references/STATE-JOURNEY.md) | States, user journeys |
| [references/DATA-CHARTS.md](references/DATA-CHARTS.md) | Gantt, Pie, Timeline, Quadrant |
| [references/ARCHITECTURE.md](references/ARCHITECTURE.md) | C4, Block, Kanban |
| [references/CHEATSHEET.md](references/CHEATSHEET.md) | All syntax quick reference |

## Resources

- **Official Documentation**: https://mermaid.js.org
- **Live Editor**: https://mermaid.live
- **GitHub Repository**: https://github.com/mermaid-js/mermaid
- **GitHub Markdown Support**: https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-diagrams
- **GitLab Markdown Support**: https://docs.gitlab.com/ee/user/markdown.html#diagrams-and-flowcharts

Files: 10

Size: 79.3 KB

Complexity: 55/100

Category: Backend & APIs

Source: https://github.com/ccheney/robust-skills/tree/main/skills/mermaid-diagrams

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