cdnjs
cdnjs is a large free, open-source CDN — operated with Cloudflare — that serves popular JavaScript and CSS libraries to millions of sites. ScanMalware detects it from cdnjs.cloudflare.com asset URLs.
Public library CDNs are a supply-chain consideration: every dependent site trusts that the hosted file is unmodified. Comparing loaded assets against known-good fingerprints helps confirm a CDN file has not been tampered with.
Commonly deployed alongside cdnjs
Of the 25,704 public scans where cdnjs was detected, these are the technologies most often present on the same site. The share is the percentage of cdnjs sites that also ran each one.
| Technology | Category | Share of cdnjs sites |
|---|---|---|
| Cloudflare | wappalyzer | 100% |
| jQuery | wappalyzer | 69.56% |
| JQuery | miscellaneous | 57.28% |
| Google Analytics | wappalyzer | 38.69% |
| Open-Graph-Protocol | miscellaneous | 38.44% |
| HSTS | wappalyzer | 34.28% |
| Cloudflare Bot Management | wappalyzer | 34.18% |
| X-UA-Compatible | miscellaneous | 29.69% |
| jQuery CDN | wappalyzer | 28.2% |
| Google Hosted Libraries | wappalyzer | 26.08% |
| HTTP/3 | wappalyzer | 24.5% |
| Google Tag Manager | wappalyzer | 23.35% |
| Google-Analytics | miscellaneous | 21.61% |
| jsDelivr | wappalyzer | 20.93% |
How ScanMalware detects cdnjs
cdnjs is detected by analysing the response headers, HTML markup, JavaScript runtime and asset URLs captured when ScanMalware loads the site in a real headless browser.
From any scan you can pivot into related signals — JARM TLS fingerprints, ASN ownership and BGP routing, certificate history, JavaScript analysis and the overall security verdict — to understand not just that cdnjs is present, but how it is being used. Open the full search interface for cdnjs →
Recent public scans featuring cdnjs
A rolling sample of recent public scans where cdnjs was detected. Listing a site here is not a safety judgement — open a scan to see its full verdict.
| Site | Scanned |
|---|---|
| QR Code Generator - Shortener https://qrco.de/microsoft13 | 2026-11-04 |
| QR Code Generator - Shortener https://qrco.de/microsoft2a | 2026-11-04 |
| Simulazione attacco reale https://microsoft.dropcloud.it/accountmicrosoft365/security/review-activity?rid=ktrFbSw | 2026-11-04 |
| Upromise | Turn spending into college savings | Win $20K https://upromise.com | 2026-11-04 |
| PORTAL - Mail Authentication https://obontezip--danielsplurnbin.replit.app/ | 2026-11-04 |
| Shop Covid-19 + Flu A&B At-Home Test Kits—Easy, Fast, and Reliable – iHealth Labs Inc https://ihealthlabs.com/products/ihealth-covid-19-flu-a-b-antigen-rapid-home-test?srsltid=… | 2026-11-04 |
| FlowFlex COVID-19 Rapid Test https://www.testkitsusa.com/healthconfirm-covid-19-flu-a-b-antigen-test/ | 2026-11-04 |
| 咲夜の小屋 https://kagurazakasakuya-github-io.pages.dev/ | 2026-11-04 |
Frequently asked questions about cdnjs
- Does using cdnjs mean a website is unsafe?
- No. cdnjs is a stack component, not a verdict. ScanMalware scores the whole page — its scripts, redirects, certificates, threat-intelligence matches and behaviour — so a site using cdnjs can be perfectly safe or actively malicious.
- How many sites using cdnjs has ScanMalware scanned?
- cdnjs has been detected in 25,704 public scans on ScanMalware.com. Each scan is a real headless-browser visit, and the figure updates as new URLs are submitted.
- What technologies are commonly used with cdnjs?
- Across scanned sites, cdnjs is most often seen alongside Cloudflare, jQuery and JQuery. The full co-occurrence breakdown is listed on this page.
Browse all profiled technologies on the technology index, or scan a URL to see its full stack.