How to Detect Any Website's Tech Stack in JavaScript (No Browser Required)

Ever wondered what framework a website uses? Or which CDN, analytics tool, or CMS powers a competitor's site? Tools like Wappalyzer and BuiltWith charge for API access, but you can build your own tech stack detector with a simple web scraping API. In this tutorial, we'll build a CLI tool that analyzes any website's HTML and identifies its technology stack — frameworks, CDNs, analytics, CMS platforms, and more. What We're Building A Node.js script that: Fetches a website's full HTML (rendered JavaScript included) Detects frontend frameworks (React, Vue, Angular, Svelte, Next.js) Identifies CSS frameworks (Tailwind, Bootstrap, Bulma) Spots analytics & tracking (Google Analytics, Hotjar, Segment, Plausible) Finds CDNs (Cloudflare, Fastly, AWS CloudFront) Detects CMS platforms (WordPress, Shopify, Webflow, Ghost) Identifies hosting/infrastructure clues Prerequisites Grab a free API key (200 credits, no card required): curl -s -X POST https://api.frostbyte.world/api/keys/create | jq Save th