lighthouse-mcp

An MCP server that wraps around Google's Lighthouse tool to help measure various performance metrics for web pages.

• Run comprehensive Lighthouse audits on any URL
• Get performance scores and metrics
• Configure device emulation (mobile/desktop)
• Control network throttling
• Select specific audit categories

This server is available in the Model Context Protocol Registry. Install it using your MCP client or Claude Desktop.

You can run the tool directly using npx without installation:

npx lighthouse-mcp

Install the package globally from npm:

npm install -g lighthouse-mcp

Then run it:

lighthouse-mcp

1. Clone this repository
2. Install dependencies:

   npm install

3. Build the project:

   npm run build

4. Run the server:

   npm start

Add the following to your MCP settings configuration file:

{
  "mcpServers": {
    "lighthouse": {
      "command": "npx",
      "args": ["lighthouse-mcp"],
      "disabled": false,
      "autoApprove": []
    }
  }
}

Add the following to your MCP settings configuration file:

{
  "mcpServers": {
    "lighthouse": {
      "command": "node",
      "args": ["/absolute/path/to/lighthouse-mcp/build/index.js"],
      "disabled": false,
      "autoApprove": []
    }
  }
}

Replace /absolute/path/to/lighthouse-mcp with the actual path to this project.

Run a comprehensive Lighthouse audit on a URL.

Parameters:

• url (required): The URL to audit
• categories (optional): Array of categories to audit (defaults to all)
  • Options: "performance", "accessibility", "best-practices", "seo", "pwa"
• device (optional): Device to emulate (defaults to "mobile")
  • Options: "mobile", "desktop"
• throttling (optional): Whether to apply network throttling (defaults to true)

Example:

{
  "url": "https://example.com",
  "categories": ["performance", "accessibility"],
  "device": "desktop",
  "throttling": false
}

Get just the performance score for a URL.

Parameters:

• url (required): The URL to audit
• device (optional): Device to emulate (defaults to "mobile")
  • Options: "mobile", "desktop"

Example:

{
  "url": "https://example.com",
  "device": "mobile"
}

Once the MCP server is configured, you can use it with Claude:

What's the performance score for example.com?

Claude will use the get_performance_score tool to analyze the website and return the results.

• Node.js 16+
• Chrome/Chromium browser (for Lighthouse)