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@vtomilin

Repository

About The

MCP server to efficiently check all Mermaid diagram types for syntax errors

#ai#mcp#mcp-server#llm-mcp

Config

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

{
  "mcpServers": {
    "mermaider": {
      "command": "npx",
      "args": [
        "-y",
        "@vtomilin/mermaider",
        "<config>"
      ]
    }
  }
}

Tools

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Fetch the live tool list by running this server in a temporary sandbox using the button above.

Overview

What is mermaider?

mermaider is an MCP server that provides a single validate_syntax tool to check all Mermaid diagram types for syntax errors. It uses puppeteer-core and an already installed Chrome-based or Firefox browser to run the official Mermaid.js API in a headless page. It is built for developers and LLMs that generate Mermaid diagrams and need fast, reliable syntax validation.

How to use mermaider?

Install and configure your MCP client to run npx -y @vtomilin/mermaider <config>, where <config> is either an inline JSON string or a path to a JSON configuration file containing the browser’s executablePath (and optionally "browser": "firefox"). The server opens a headless browser once and reuses it for all subsequent tool calls, keeping latency low. Examples are provided for VSCode, Cursor/Windsurf, and Bun (via global installation).

Key features of mermaider

  • Single validate_syntax tool for all Mermaid diagram types
  • Reuses a persistent headless browser instance for low latency
  • Uses puppeteer-core – no automatic browser download
  • Faster and more deterministic than mmdc-based validators
  • Supports Chrome-based and Firefox browsers

Use cases of mermaider

  • Validating

Comments

Basic information

Category

Other

License

MIT license

Transports

stdio

Author

vtomilin

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