Express.js is a minimal, unopinionated Node.js web framework used across the JavaScript ecosystem as the default choice for REST APIs, server-rendered apps, and the backend layer under countless full-stack projects (including many AI-generated ones, since Node/Express is a natural pairing for a JS-generated frontend). AIWebsiteDetector identifies Express deployments through the `X-Powered-By: Express` response header, which Express sets by default on every response unless a developer explicitly disables it via `app.disable('x-powered-by')` — a single reliable header is normally enough for confident detection.
Detect Express.js Websites — Free Tool
Enter any URL to check if it was built with Express.js. Instant results, no account required.
How we detect Express.js — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect Express.js Websites
HTTP Headers
1 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for express.js-specific patterns in the HTML.
4. Use AI Website Detector (Easiest)
Our automated scanner checks all these signals at once and gives you an instant confidence score. Just enter any URL above.
Frequently Asked Questions
Is this website built with Express.js?
You can detect if any website was built with Express.js by using our free scanner above. Just enter the URL and we'll analyze HTML patterns, JavaScript files, CDN domains, and HTTP headers to determine if Express.js was used — with a confidence score.
How to detect if a website was built with Express.js?
There are several ways to detect Express.js: (1) View the page source and look for Express.js-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Express.js CDN domains, (3) Use our free tool — we check 1 detection signals automatically.
What websites are built with Express.js?
Express.js is used by thousands of websites worldwide. Our scanner has detected many Express.js-built sites across different industries. You can scan any URL to check if it uses Express.js.
How accurate is the Express.js detection?
Our Express.js detection engine checks 1 unique fingerprint signals, achieving high confidence results. We score each match and return a confidence percentage so you know how certain the detection is.
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Detection Info
- Category
- JavaScript Framework
- Signals Used
- 1 patterns
- Accuracy
- High
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