Markmap MCP Server

Markmap MCP Server

Markmap MCP Server is based on the Model Context Protocol (MCP). It converts Markdown into interactive mind maps using markmap, and can optionally export PNG / JPG / SVG on the server for Agent-friendly delivery. Generation runs locally — no third-party API keys required.

Features

• Markdown → Mind Map: Convert Markdown (headings + nested lists) to interactive HTML mind maps
• Agent-friendly returns: Return a file path, inline HTML, and/or image content (configured at startup)
• Server-side export: Export PNG / JPG / SVG via Playwright for chat/inline preview
• Browser preview: Configurable open behavior — always, never, or agent-decided (startup setting)
• Browser export toolbar: When viewing HTML, also export PNG/JPG/SVG or copy Markdown in the page UI
• Offline HTML: Startup --offline inlines assets so the page works without CDN access
• File workflows: Read from inputPath, list recent outputs, clean up old files
• Privacy-first: Fully local conversion; no cloud mind-map API

Prerequisites

1. Node.js v20 or above
2. For server-side image export (format: png|jpg|svg): install Playwright and Chromium

npm install playwright
npx playwright install chromium

(playwright is an optional dependency of this package.)

Installation

# Install from npm
npm install @jinzcdev/markmap-mcp-server -g

# Basic run
npx -y @jinzcdev/markmap-mcp-server

# Specify output directory and auto-open in browser
npx -y @jinzcdev/markmap-mcp-server --output /path/to/output/directory --open always

Docker

docker build -t markmap-mcp-server .
docker run --rm -i \
  -v /path/to/output:/data/markmap \
  -e MARKMAP_DIR=/data/markmap \
  markmap-mcp-server

Or clone and run locally:

git clone https://github.com/jinzcdev/markmap-mcp-server.git
cd markmap-mcp-server
npm install && npm run build
# Optional: enable server-side image export
npx playwright install chromium
node build/index.js

Usage

Add the following configuration to your MCP client (Cursor / Claude Desktop / etc.):

{
  "mcpServers": {
    "markmap": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@jinzcdev/markmap-mcp-server"],
      "env": {
        "MARKMAP_DIR": "/path/to/output/directory",
        "MARKMAP_OPEN": "never",
        "MARKMAP_RETURN_MODE": "path"
      }
    }
  }
}

Server preferences (CLI / env)

These are decided when the server starts — not tool arguments:

Preference	CLI	Env	Values	Default
Output directory	--output / -o	MARKMAP_DIR	any directory path	~/.markmap-mcp
Open in browser	--open [mode]	MARKMAP_OPEN	always | never | agent (bare --open = always)	never
Return mode	--return-mode	MARKMAP_RETURN_MODE	path | content | both	path
Offline HTML	--offline	MARKMAP_OFFLINE	true | false (CLI: pass --offline to enable)	false

CLI flags override environment variables. --output overrides MARKMAP_DIR.

--open: bare --open means always. You may also pass --open always|never|agent. An invalid value exits with an error. Without the flag, MARKMAP_OPEN is used (default never).

Return mode:

Mode	Meaning
path	Paths JSON only (htmlFilePath + filePath)
content	Inline content only (raw HTML text, or a base64 image block) — no paths
both	Paths JSON plus inline content

Generated HTML always includes the markmap toolbar, English export labels, and fully expanded nodes.

Example prompts

• “Summarize this design doc as a mind map.”
• “Convert ./notes/architecture.md to a mind map.”
• “Generate a PNG mind map of this outline for the chat.”

Available Tools

markdown_to_mindmap

Convert Markdown into an interactive mind map (and optionally an image).

Parameter	Type	Default	Description
markdown	string	—	Markdown content (required unless inputPath is set). Wins when both are provided.
inputPath	string	—	Absolute path to a local .md file
format	html | png | svg | jpg	html	Output format. Image formats need Playwright
filename	string	auto	Output base name (sanitized; prefixed with markmap- if needed; reusing overwrites)
open	boolean	false	Whether to open the result in browser. Only exposed when server open mode is agent (--open agent / MARKMAP_OPEN=agent).

Return (returnMode=path):

{
  "htmlFilePath": "/path/to/markmap-….html",
  "filePath": "/path/to/markmap-….html"
}

For image formats, filePath is the image path and htmlFilePath is still the HTML source.

Return (returnMode=content): Raw HTML text block, or an MCP image content block (base64) for png/jpg/svg — no paths JSON. Oversized HTML (≥200KB) falls back to paths JSON.

Return (returnMode=both): Paths JSON plus the inline content above.

Note: Interactive zoom/collapse and the in-page “Export PNG/JPG/SVG” buttons are part of the HTML viewer. Server-side format: png|jpg|svg is what Agents can consume directly without a manual browser click.

list_mindmaps

List recent generated files in the output directory (newest first). Only files whose names start with markmap are included.

Parameter	Type	Default	Description
limit	number	20	Max files to return (1–200)

Returns {outputDir, files: [{name, filePath, size, mtimeMs, mtime}]}.

get_mindmap

Retrieve a generated mind map file by its absolute path. Path must stay inside the configured output directory (path traversal denied).

Parameter	Type	Default	Description
filePath	string	—	Absolute path to the mind map file (HTML or image)

Returns JSON {filePath, mimeType, size}. For HTML/SVG under 200KB, also appends a text content block. PNG/JPG return metadata only (no image block) — re-export via markdown_to_mindmap with format=png\|jpg if pixels are needed.

cleanup_mindmaps

Delete old (or all) generated mind map files.

Parameter	Type	Default	Description
maxAgeDays	number	7	Delete files older than this many days
all	boolean	false	If true, delete all markmap files
dryRun	boolean	false	If true, preview without deleting

Prompt: mindmap_from_content

Helper prompt that asks the model to structure notes as Markdown, then call markdown_to_mindmap.

Parameter	Type	Default	Description
topic	string	—	Topic or raw notes to organize as a map

Related Projects

Project	Description
MarkXMind Online	Create XMind mind maps with Markdown online. Try it →
Obsidian MarkXMind Plugin	Render XMindMark syntax as XMind mind maps inside Obsidian.

License

This project is licensed under the MIT License.