How to Detect a Website's Tech Stack with a Single API Call

2026-03-14 | Tags: api, webdev, techstack, javascript, react

How to Detect a Website's Tech Stack with a Single API Call

Ever wondered what framework powers a competitor's website? Whether they're using React or Vue? What analytics they run? What CDN serves their assets?

Our Tech Stack Detection API answers all of these questions with a single HTTP request.

Quick Start

curl "https://51-68-119-197.sslip.io/api/techstack?url=https://github.com"

Response (abbreviated):

{
  "url": "https://github.com",
  "technologies": {
    "framework": [
      {"name": "React", "confidence": 0.9}
    ],
    "hosting": [
      {"name": "GitHub Pages", "confidence": 0.8}
    ],
    "cdn": [
      {"name": "Fastly", "confidence": 0.95}
    ],
    "analytics": [
      {"name": "Google Analytics", "confidence": 0.85}
    ]
  }
}

What It Detects

The API identifies technologies across 10+ categories:

Category Examples
Frameworks React, Vue.js, Angular, Next.js, Nuxt, Svelte, Gatsby
CMS WordPress, Drupal, Joomla, Ghost, Strapi
Hosting Vercel, Netlify, AWS, Google Cloud, Heroku
CDN Cloudflare, Fastly, Akamai, CloudFront
Analytics Google Analytics, Plausible, Fathom, Hotjar, Mixpanel
JavaScript libraries jQuery, Lodash, Moment.js, Three.js
CSS frameworks Tailwind CSS, Bootstrap, Bulma
E-commerce Shopify, WooCommerce, Magento
Server Nginx, Apache, Express, Caddy
Security Cloudflare, reCAPTCHA, hCaptcha

How It Works

The API loads the target URL in a headless Chromium browser and analyzes:

  1. HTTP headers — Server, X-Powered-By, CDN indicators
  2. HTML meta tags — Generator tags, framework-specific meta
  3. JavaScript globals — window.__NEXT_DATA__, window.__NUXT__, window.React
  4. DOM patterns — Framework-specific attributes (data-reactroot, ng-version, data-v-)
  5. Resource URLs — CDN domains, analytics script sources, font services
  6. CSS patterns — Tailwind utility classes, Bootstrap grid classes

Use Cases

Competitive Analysis

Compare your tech stack against competitors:

# Check what your competitor uses
curl "https://51-68-119-197.sslip.io/api/techstack?url=https://competitor.com"

Lead Qualification

Sales teams use tech stack data to qualify leads. If a prospect uses React, pitch your React component library. If they use WordPress, pitch your WordPress plugin.

Security Auditing

Identify outdated or vulnerable technologies before they become attack vectors:

# Check for known vulnerable libraries
curl "https://51-68-119-197.sslip.io/api/techstack?url=https://your-site.com"

Market Research

Survey which technologies dominate a market segment by checking dozens of sites in your industry.

Rate Limits

Feature Anonymous Free API Key
Daily requests 10 50
Rate limit 1 req/10s 1 req/30s window

Get a free API key at our API docs page — no signup required, no email needed.

Combine with Screenshot API

Pair tech stack detection with our Screenshot API for visual competitive analysis — capture how competitor sites look while analyzing what they're built with.

# Detect tech stack
curl "https://51-68-119-197.sslip.io/api/techstack?url=https://example.com"

# Capture screenshot
curl "https://51-68-119-197.sslip.io/api/screenshot?url=https://example.com&width=1920&height=1080" -o competitor.png

Try It Now

Use our interactive tech stack detector to analyze any website instantly.

Or call the API directly:

curl "https://51-68-119-197.sslip.io/api/techstack?url=https://your-target-site.com"