Express

registrynpm

package nameexpress

maintainerExpress Contributors / OpenJS Foundation

Express is the most widely used Node.js web framework, powering a vast share of all Node.js HTTP servers. It handles request routing, middleware composition, and response generation. Express is used in production APIs, proxy servers, and microservices across virtually every industry.

api usage

Checking Express

express 4.21.0 is a clean version with no known supply chain compromise. The response returns compromised: false with an empty sources array.

bash

curl "https://api.attestd.io/v1/check?product=express&version=4.21.0" \
  -H "Authorization: Bearer YOUR_API_KEY"

json

{
  "product": "express",
  "version": "4.21.0",
  "supported": true,
  "risk_state": "none",
  "supply_chain": {
    "compromised": false,
    "sources": [],
    "malware_type": null,
    "description": null,
    "advisory_url": null,
    "compromised_at": null,
    "removed_at": null
  },
  "last_updated": "2026-05-01T00:00:00Z"
}

attack surface

Why this package is monitored

Express middleware executes on every incoming HTTP request before application route handlers. A backdoored version can intercept all request bodies, authentication headers, and session cookies processed by the application.

Attestd monitors express using the following detection sources:

registry

Manually curated advisories in the Attestd registry, verified by a human analyst. Confidence 1.0.

osv

OSV.dev malicious-package advisories with IDs prefixed MAL-. Confidence 0.95.

npm_deprecation

npm package versions with deprecation messages containing targeted attack language such as malicious, backdoor, or compromised. Confidence 0.80.

Supply chain overview All npm packages Helmet Passport.js Mongoose node-postgres (pg)Response fields