Mermaid Diagram

Generate valid Mermaid diagrams like flowcharts, sequence diagrams, mind maps, ER diagrams, or user journeys from text or product descriptions.

Mermaid Diagram Generator

Generate valid Mermaid diagram code from text descriptions.

Diagram Type Selection

需求	推荐类型	Mermaid 关键字
业务流程 / 逻辑流程	Flowchart	flowchart TD
系统交互 / API 时序	Sequence	sequenceDiagram
产品架构 / 系统结构	Flowchart / C4	flowchart LR
状态机 / 用户状态	State	stateDiagram-v2
脑图 / 功能树	Mindmap	mindmap
数据库结构	ER	erDiagram
项目时间线	Timeline	timeline
用户旅程	Journey	journey

Output Rules

1. Always wrap output in ```mermaid code blocks
2. Use Chinese labels when the user writes in Chinese
3. Add comments (%%) for complex diagrams to explain sections
4. Keep node names short (≤10 chars) to avoid layout issues
5. Validate syntax mentally before outputting — common mistakes:
   • Missing quotes around labels with spaces/Chinese
   • Wrong arrow syntax (--> vs --- vs ->>)
   • Unclosed brackets

Quick Syntax Reference

flowchart TD
    A[开始] --> B{判断条件}
    B -- 是 --> C[执行操作]
    B -- 否 --> D[结束]
    C --> D

sequenceDiagram
    用户->>服务端: 发起请求
    服务端->>数据库: 查询数据
    数据库-->>服务端: 返回结果
    服务端-->>用户: 响应

mindmap
  root((产品名))
    功能A
      子功能1
      子功能2
    功能B

Reference Files

• references/diagram-patterns.md — 产品经理常用图模式（带完整示例代码）

Read when: user asks for a specific diagram type or needs a complex multi-node diagram.