Builtwith Api

BuiltWith API

Query the BuiltWith API from your app, terminal, or AI agent.

Installation

# Homebrew (CLI only)
brew install zcaceres/tap/builtwith

# npm (library + CLI)
npm install builtwith-api

# MCP server (separate package)
npm install -g builtwith-mcp

Requires Node.js >= 18 (uses native `fetch`).

Breaking Changes in v3

• ESM-only - no more CommonJS/require() support
• Named export - import { createClient } from 'builtwith-api' (not default/require)
• Zod validation - invalid inputs throw ZodError instead of manual error messages
• Typed responses - methods return typed response objects (when using JSON format)

Features

Response Formats

• JSON support
• XML support
• CSV support
• TSV support (lists, relationships)
• TXT support (lists only)

APIs

Method	Description
free	Free technology summary
domain	Full domain technology lookup
lists	Sites using a technology
relationships	Related domains
keywords	Domain keyword extraction
trends	Technology adoption trends
companyToUrl	Company name to domains
domainLive	Live domain detection
trust	Trust & fraud signals
tags	IP & attribute lookups
recommendations	Technology suggestions
redirects	Redirect chain history
product	E-commerce product search

Library Usage

import { createClient } from 'builtwith-api'

// Initialize with your API key
const builtwith = createClient(process.env.BUILTWITH_API_KEY, {
  responseFormat: 'json' // 'json' 'xml' 'csv' 'tsv' 'txt' (txt only for lists API)
})

const url = 'facebook.com'

// Free lookup - quick summary
await builtwith.free(url)

// Full domain analysis
await builtwith.domain(url, {
  // This will hide technology description, link, tag and category fields
  hideAll: false,
  // This will hide technology description and link fields (but keep tag and categories)
  hideDescriptio