Introduction

builtwith-api is a typed wrapper around the BuiltWith API that works as a library, CLI, and MCP server.

What is BuiltWith?

BuiltWith tracks the technologies used by websites across the internet — frameworks, analytics, CMS platforms, e-commerce tools, CDNs, and more. Their API gives you programmatic access to this intelligence.

Three ways to use it

Library

Import createClient and call methods directly. Responses are validated with Zod and fully typed.

import { createClient } from "builtwith-api";

const client = createClient(process.env.BUILTWITH_API_KEY!);
const profile = await client.free("example.com");

CLI

Query from your terminal. Output is JSON, ready for piping.

builtwith free example.com
builtwith domain example.com --onlyLiveTechnologies

MCP Server

Connect BuiltWith to AI tools that support the Model Context Protocol.

{
  "mcpServers": {
    "builtwith": {
      "command": "npx",
      "args": ["-y", "--package", "builtwith-api", "builtwith-mcp"],
      "env": { "BUILTWITH_API_KEY": "your-key" }
    }
  }
}

Requirements

• Node.js 18+
• A BuiltWith API key