engine.io 4.0.1

The realtime engine behind Socket.IO. Provides the foundation of a bidirectional connection between client and server

engine.io@4.0.1 was published on 2020-10-21. Its manifest declares 7 runtime dependencies and 0 peer requirements. Bundled type declarations are not declared in the inspected metadata. The declared Node.js requirement is >=10.0.0.

All engine.io versions · Permanent reference to 4.0.1 · Latest release

Package specifications

Version4.0.1
License declarationMIT
Published2020-10-21T22:32:58.597Z
Node.js requirement>=10.0.0
Type declarationsNot declared
Runtime dependency count7
Peer requirement count0
Optional dependency count0
Minified sizeMeasurement not available yet
Minified + gzipMeasurement not available yet
Unpacked distribution size71.59 KiB
Published file count12
Package typeNot declared
ES module entryNot declared
Default entrylib/engine.io
Side effects declarationNot declared
Direct advisories2
Resolved graph dependencies14
Repository stars63225
Repository forks10218

Install engine.io 4.0.1

npm install engine.io@4.0.1
pnpm add engine.io@4.0.1
yarn add engine.io@4.0.1

Runtime dependencies

Peer requirements

  • None declared

Optional dependencies

  • None declared

Resolved dependency graph

This deps.dev graph describes a generic 64-bit Linux environment, not your application lockfile.

How to interpret the specifications

Bundlephobia measurements use its standard package build and may exclude peer dependencies. Unpacked npm distribution size includes shipped files and is a different measurement. Module declarations do not prove tree-shaking or runtime compatibility.

Advisories apply to this package version directly; transitive dependencies need separate inspection. Repository signals describe the whole repository and are current observations, including on historical-version pages.

Known direct advisories

OpenSSF repository checks

Provider assessment: 2026-08-24T00:00:00Z. These are repository checks, not a jsL maintenance score.

Code-Review1/10 — Found 3/30 approved changesets -- score normalized to 1
Maintained10/10 — 30 commit(s) and 20 issue activity found in the last 90 days -- score normalized to 10
Security-Policy10/10 — security policy file detected
Dangerous-Workflow10/10 — no dangerous workflow patterns detected
CII-Best-Practices0/10 — no effort to earn an OpenSSF best practices badge detected
Token-Permissions9/10 — detected GitHub workflow tokens with excessive permissions
Binary-Artifacts9/10 — binaries present in source code
License10/10 — license file detected
Fuzzing0/10 — project is not fuzzed
SAST0/10 — SAST tool is not run on all commits -- score normalized to 0
Packaging10/10 — packaging workflow detected
Pinned-Dependencies2/10 — dependency not pinned by hash detected -- score normalized to 2

Evidence and freshness