mammoth-mcp

A Model Context Protocol (MCP) server for converting DOCX files to HTML using mammoth.js.

Features

• convert_docx_to_html: Convert DOCX files to clean HTML with advanced styling options
• convert_docx_to_html_with_images: Convert DOCX files to HTML with embedded base64 images
• extract_raw_text: Extract plain text content from DOCX files
• convert_docx_to_markdown: Convert DOCX files to Markdown format

Installation

$ pnpm install

Development

$ npm run dev
$ npm run build

Usage

Configure MCP Client

Add the server to your MCP client configuration (e.g., Claude Desktop).

The configuration file is located at:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

Option 1: Using npx (Recommended)

This will automatically install and run the latest version:

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

Option 2: Using local installation

If you've cloned the repository locally:

{
  "mcpServers": {
    "mammoth": {
      "command": "node",
      "args": ["/absolute/path/to/mammoth-mcp/dist/esm/index.js"]
    }
  }
}

After updating the configuration, restart Claude Desktop for the changes to take effect.

Available Tools

convert_docx_to_html

Convert a DOCX file to HTML.

Parameters:

• filePath (string, required): Absolute path to the DOCX file
• styleMap (string, optional): Custom style map to control Word styles to HTML conversion
• ignoreEmptyParagraphs (boolean, optional): Whether to ignore empty paragraphs (default: true)
• idPrefix (string, optional): Prefix for generated IDs (bookmarks, footnotes, endnotes)
• includeDefaultStyleMap (boolean, optional): Whether to include default style map (default: true)
• includeEmbeddedStyleMap (boolean, optional): Whether to include embedded style map from document (default: true)

Example:

{
  "filePath": "/path/to/document.docx",
  "styleMap": "p[style-name='Section Title'] => h1:fresh\nb[style-name='Emphasis'] => em",
  "ignoreEmptyParagraphs": false,
  "idPrefix": "doc-"
}

convert_docx_to_html_with_images

Convert a DOCX file to HTML with images embedded as base64 data URIs.

Parameters:

• filePath (string, required): Absolute path to the DOCX file
• styleMap (string, optional): Custom style map to control Word styles to HTML conversion
• ignoreEmptyParagraphs (boolean, optional): Whether to ignore empty paragraphs (default: true)
• idPrefix (string, optional): Prefix for generated IDs (bookmarks, footnotes, endnotes)
• includeDefaultStyleMap (boolean, optional): Whether to include default style map (default: true)
• includeEmbeddedStyleMap (boolean, optional): Whether to include embedded style map from document (default: true)

Example:

{
  "filePath": "/path/to/document-with-images.docx",
  "styleMap": "p[style-name='Code'] => pre:separator('\\n')"
}

extract_raw_text

Extract raw text from a DOCX file, ignoring all formatting. Useful for indexing, search, or text analysis.

Parameters:

• filePath (string, required): Absolute path to the DOCX file

Example:

{
  "filePath": "/path/to/document.docx"
}

convert_docx_to_markdown

Convert a DOCX file to Markdown format. Note: This feature is deprecated by mammoth.js but remains functional.

Parameters:

• filePath (string, required): Absolute path to the DOCX file
• styleMap (string, optional): Custom style map to control Word styles to Markdown conversion
• ignoreEmptyParagraphs (boolean, optional): Whether to ignore empty paragraphs (default: true)
• idPrefix (string, optional): Prefix for generated IDs (bookmarks, footnotes, endnotes)
• includeDefaultStyleMap (boolean, optional): Whether to include default style map (default: true)
• includeEmbeddedStyleMap (boolean, optional): Whether to include embedded style map from document (default: true)

Example:

{
  "filePath": "/path/to/document.docx",
  "styleMap": "p[style-name='Heading 1'] => # "
}

How It Works

This MCP server uses mammoth.js to convert DOCX documents to clean, semantic HTML or Markdown. The conversion preserves:

• Headings
• Paragraphs
• Lists
• Tables
• Bold/italic/underline formatting
• Images (when using the with_images variant)
• Custom style mappings (via styleMap parameter)

Style Maps

Style maps allow you to control how Word styles are converted to HTML/Markdown. Each line in a style map represents a mapping from a Word style to an HTML/Markdown element.

Example style map:

p[style-name='Section Title'] => h1:fresh
p[style-name='Subsection Title'] => h2:fresh
p[style-name='Code'] => pre:separator('\n')

For more information on style maps, see the mammoth.js documentation.

LICENSE

MIT