mcp-mermaid-validator

Overview

This MCP server provides a tool for validating Mermaid diagram syntax and rendering them as PNG images. It uses the Mermaid CLI tool to process diagram input through Node.js child processes, allowing it to capture both validation results and rendered outputs. The server returns text confirmation along with base64-encoded PNG data for valid diagrams, and detailed error messages for invalid ones.

Try asking AI

After installing, here are 5 things you can ask your AI assistant:

• validateMermaiddiagram: string

  Validates a Mermaid diagram and returns the rendered PNG if valid

  Try:Validate this Mermaid diagram: graph TD; A-->B; A-->C; B-->D; C-->D;Try:Can you check if this Mermaid syntax is correct and show me the result?Try:Validate and render this flowchart: sequenceDiagram; participant A; participant B; A->>B: Hello;

Comparable tools

Installation

npx -y @rtuin/mcp-mermaid-validator@latest

{
  "mcpServers": {
    "mermaid-validator": {
      "command": "npx",
      "args": [
        "-y",
        "@rtuin/mcp-mermaid-validator@latest"
      ]
    }
  }
}

FAQ

What image formats are supported?

The server currently outputs diagrams in PNG format for better compatibility with most MCP clients, particularly those that don't support SVG.

How are errors handled?

The server distinguishes between validation errors (invalid diagram syntax) and system errors, providing detailed error messages to help users fix their diagrams while maintaining service stability.

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