mermaid-live-mcp - From prompt to diagram in seconds MCP Server

@iishyfishyy

Basic information

About mermaid-live-mcp - From prompt to diagram in seconds MCP Server

An MCP server that generates live Mermaid diagrams from any AI assistant. Claude, Cursor, and more.

#mermaid #diagrams#visualize#live#render #preview

mermaid-live-mcp - From prompt to diagram in seconds MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "mermaid": {
      "command": "npx",
      "args": [
        "-y",
        "mermaid-live-mcp"
      ]
    }
  }
}

mermaid-live-mcp - From prompt to diagram in seconds MCP Server tools

Generate a diagram from Mermaid.js syntax. Renders in live preview browser with SVG/PNG download options. Supports flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, and more.

Replace a diagram's Mermaid syntax and re-render it in the preview.

List all diagrams generated in this session.

Write a diagram's SVG to disk. PNG export is available via the browser download buttons.

Overview

What is mermaid-live-mcp?

mermaid-live-mcp is an MCP (Model Context Protocol) server that lets you generate Mermaid diagrams from natural language prompts and preview them live in a browser. It renders diagrams in real-time via WebSocket and supports SVG/PNG export. This tool is intended for developers and AI assistant users who want to quickly create and iterate on diagrams.

How to use mermaid-live-mcp?

Install the server via npx and add it to your MCP client configuration (Claude Desktop, Cursor, Claude Code, or Windsurf). The server exposes four tools: generate_mermaid, update_diagram, list_diagrams, and export_diagram. Use generate_mermaid with your Mermaid syntax to open a live browser preview, then update or export as needed.

Key features of mermaid-live-mcp

Live browser preview with real-time WebSocket updates
SVG and PNG export via download buttons or tool
Supports all Mermaid diagram types
No page refresh needed for diagram updates
Four dedicated tools for diagram lifecycle

Use cases of mermaid-live-mcp

Quickly generate flowcharts from text descriptions
Iterate on sequence diagrams during design discussions
Export class diagrams as SVG for documentation
Build ER diagrams with live preview for database modeling
Create and manage multiple Gantt charts in a single session

Frequently asked questions

What tools does the server provide?

The server provides `generate_mermaid` (create and preview), `update_diagram` (replace syntax and re-render), `list_diagrams` (list session diagrams), and `export_diagram` (save SVG to disk).

How do I install mermaid-live-mcp for Claude Desktop?

Add the MCP server configuration to your Claude Desktop config file located at `~/Library/Application Support/Claude/claude_desktop_config.json` on macOS, using the command: `npx -y mermaid-live-mcp`.

How does the live preview work?

The server opens a browser tab with the diagram rendered as SVG. Any updates to a diagram are pushed instantly to the browser via a WebSocket connection – no page refresh required.

Can I export diagrams as images?

Yes. You can download SVG or PNG from the live preview buttons, or use the `export_diagram` tool to write the SVG directly to disk.

What diagram types does mermaid-live-mcp support?

All standard Mermaid diagram types are supported, including flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, pie charts, git graphs, mindmaps, timelines, and more.

Comments

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