Wappalyzer

wappalyzer-mcp is a local stdio MCP server that wraps the public Wappalyzer API.

Requirements

• Node.js 20+
• A Wappalyzer API key in WAPPALYZER_API_KEY

Install

cd /Users/elbert/Sites/wappalyzer/mcp
npm install

Run

WAPPALYZER_API_KEY=your_api_key npx wappalyzer-mcp

Environment variables:

• WAPPALYZER_API_KEY required
• WAPPALYZER_API_BASE_URL optional, defaults to https://api.wappalyzer.com/v2/
• WAPPALYZER_METADATA_BASE_URL optional, defaults to WAPPALYZER_API_BASE_URL
• WAPPALYZER_HTTP_TIMEOUT_MS optional, defaults to 30000

The server fails fast on startup if WAPPALYZER_API_KEY is missing.

Tools

lookup_site

Inputs:

• url required
• live optional, default false
• sets optional, default []
• denoise optional, default true
• max_age optional, default 2

Notes:

• exactly one URL is accepted
• recursive=false is always forced
• unsupported async-only parameters are not exposed
• sets is limited to locale, email, phone, contact, social, meta, security, trackers, company, keywords, signals, createdAt, events, and all

Output:

{
  "request": {
    "url": "https://www.wappalyzer.com/",
    "live": false,
    "sets": [
      "company",
      "contact"
    ],
    "denoise": true,
    "max_age": 2,
    "recursive": false
  },
  "data": {},
  "credits": {
    "spent": 1,
    "remaining": 99999
  }
}

lookup_subdomains

Inputs:

• domain required
• limit optional, default 100
• after optional

Notes:

• exactly one domain is accepted
• limit must be between 10 and 1000 and a multiple of 10

Output:

{
  "request": {
    "domain": "example.com",
    "limit": 100
  },
  "data": {},
  "credits": {
    "spent": 1,
    "remaining": 99999
  }
}

get_credit_balance

Output:

{
  "credits": 99999
}

Resources

• wappalyzer://technologies
• wappalyzer://technologies/{slug}
• wappalyzer://categories
• wappalyzer://categories/{slug}

These resources are read-only and fetch public metadata from:

• GET /technologies/
• GET /technologies/{slug}/
• GET /categories/
• GET /categories/{slug}/

Metadata resources do not send the API key and are cached in-process for 5 minutes.

Client Config

Claude Desktop

Add this to claude_desktop_config.json:

{
  "mcpServers": {
    "wappalyzer": {
      "command": "node",
      "args": [
        "/Users/elbert/Sites/wappalyzer/mcp/index.js"
      ],
      "env": {
        "WAPPALYZER_API_KEY": "your_api_key"
      }
    }
  }
}

Cursor

Add this to .cursor/mcp.json:

{
  "mcpServers": {
    "wappalyzer": {
      "command": "node",
      "args": [
        "/Users/elbert/Sites/wappalyzer/mcp/index.js"
      ],
      "env": {
        "WAPPALYZER_API_KEY": "your_api_key"
      }
    }
  }
}

ChatGPT

Use a remote MCP deployment when you need ChatGPT MCP connector support.

Development

Run automated tests:

npm test

Run live smoke tests with the local secret file:

npm run test:live