Donny Nguyen

Posted on Mar 11 • Originally published at rapidapi.com

Detect Any Website's Tech Stack with One API Call

#api #webdev #javascript #devtools

Ever visited a site and wondered "what are they built with?" — whether you're doing competitive research, qualifying sales leads, or just curious.

Figuring it out manually means digging through page source, checking HTTP headers, looking for telltale script tags, and cross-referencing CDN URLs. It takes 10-15 minutes per site, and it's not reliable.

I built a Website Tech Detector API that does this automatically. Send a URL, get back a full tech stack breakdown.

API Link: Website Tech Detector API on RapidAPI

What It Detects

The API fingerprints websites across every layer of the stack:

Frontend frameworks — React, Vue, Angular, Next.js, Nuxt, Svelte
CMS platforms — WordPress, Shopify, Webflow, Wix, Squarespace, Ghost
Analytics & tracking — Google Analytics, Segment, Mixpanel, Hotjar, Facebook Pixel
CDN & hosting — Cloudflare, Vercel, Netlify, AWS, Fastly
JavaScript libraries — jQuery, Lodash, Three.js, D3
CSS frameworks — Tailwind, Bootstrap, Bulma
E-commerce — Shopify, WooCommerce, Magento, BigCommerce
Marketing tools — HubSpot, Intercom, Drift, Klaviyo
Payment processors — Stripe, PayPal, Square

Quick Start

const axios = require('axios');

const response = await axios.get(
  'https://website-tech-detector2.p.rapidapi.com/search',
  {
    params: { url: 'https://stripe.com' },
    headers: {
      'X-RapidAPI-Key': 'YOUR_RAPIDAPI_KEY',
      'X-RapidAPI-Host': 'website-tech-detector2.p.rapidapi.com'
    }
  }
);

console.log(response.data);

Response:

{
  "success": true,
  "url": "https://stripe.com",
  "count": 12,
  "data": [
    { "name": "React", "category": "JavaScript Framework", "confidence": 95 },
    { "name": "Next.js", "category": "Framework", "confidence": 90 },
    { "name": "Cloudflare", "category": "CDN", "confidence": 98 },
    { "name": "Google Analytics", "category": "Analytics", "confidence": 85 },
    { "name": "Stripe.js", "category": "Payment", "confidence": 99 }
  ]
}

Real-World Use Cases

1. Sales Lead Qualification

If you sell dev tools, Shopify plugins, or SaaS integrations — knowing your prospect's stack before the first call is a huge advantage:

async function qualifyLead(companyUrl) {
  const stack = await detectTechStack(companyUrl);

  const isShopifyStore = stack.data.some(t => t.name === 'Shopify');
  const usesReact = stack.data.some(t => t.name === 'React');
  const hasAnalytics = stack.data.some(t => t.category === 'Analytics');

  return {
    url: companyUrl,
    isQualified: isShopifyStore, // adjust for your ICP
    techStack: stack.data,
    signals: { isShopifyStore, usesReact, hasAnalytics }
  };
}

2. Competitor Analysis

Map what your competitors are using and spot patterns:

async function analyzeCompetitors(urls) {
  const results = await Promise.all(urls.map(detectTechStack));

  // Find most common technologies across competitors
  const techCount = {};
  results.forEach(r => {
    r.data.forEach(tech => {
      techCount[tech.name] = (techCount[tech.name] || 0) + 1;
    });
  });

  return Object.entries(techCount)
    .sort(([,a], [,b]) => b - a)
    .map(([name, count]) => ({ name, usedBy: count, total: urls.length }));
}

3. Market Research — Find All Shopify Stores in a Niche

async function filterByPlatform(urls, platform) {
  const results = await Promise.allSettled(
    urls.map(async url => {
      const stack = await detectTechStack(url);
      const uses = stack.data.some(t => t.name === platform);
      return uses ? url : null;
    })
  );

  return results
    .filter(r => r.status === 'fulfilled' && r.value)
    .map(r => r.value);
}

// Find all Shopify stores from a list of e-commerce URLs
const shopifyStores = await filterByPlatform(ecommerceUrls, 'Shopify');

4. Agency Prospecting

If you build websites, identify businesses running outdated platforms who might need an upgrade:

async function findOutdatedSites(urls) {
  const results = await Promise.all(urls.map(detectTechStack));

  const outdatedPlatforms = ['WordPress', 'Wix', 'Squarespace', 'jQuery'];

  return results.filter(r => 
    r.data.some(t => outdatedPlatforms.includes(t.name))
  ).map(r => ({
    url: r.url,
    platform: r.data.find(t => outdatedPlatforms.includes(t.name))?.name
  }));
}

5. Integration Compatibility Check

Before building an integration, verify your prospects are running the right stack:

async function checkIntegrationFit(prospectUrl, requiredTech) {
  const stack = await detectTechStack(prospectUrl);
  const hasRequiredTech = stack.data.some(t => 
    t.name.toLowerCase() === requiredTech.toLowerCase()
  );

  return {
    url: prospectUrl,
    compatible: hasRequiredTech,
    detectedStack: stack.data.map(t => t.name)
  };
}

Parameters

Parameter	Type	Required	Description
`url`	string	Yes	Full URL of the website to analyze

Response Fields

Field	Type	Description
`success`	boolean	Request status
`url`	string	URL analyzed
`count`	number	Technologies detected
`data`	array	Tech stack entries with name, category, confidence

Each tech entry includes:

name — Technology name (e.g., "React")
category — Classification (e.g., "JavaScript Framework")
confidence — Detection confidence score (0-100)

Pricing

Plan	Requests/mo	Price
BASIC	500	Free
PRO	10,000	$9.99/mo
ULTRA	50,000	$29.99/mo
MEGA	200,000	$79.99/mo

Get Started

Subscribe to Website Tech Detector API on RapidAPI →

Free plan available. 500 requests/month at no cost.

Built by Donny Dev — also check out Email Extractor API, DuckDuckGo Search API, and Apollo Lead Scraper API for more data tools.

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