engine.io 3.4.2
The realtime engine behind Socket.IO. Provides the foundation of a bidirectional connection between client and server
engine.io@3.4.2 was published on 2020-06-04. Its manifest declares 6 runtime dependencies and 0 peer requirements. Bundled type declarations are not declared in the inspected metadata. The declared Node.js requirement is >=8.0.0.
All engine.io versions · Permanent reference to 3.4.2 · Latest release
Package specifications
| Version | 3.4.2 |
|---|---|
| License declaration | MIT |
| Published | 2020-06-04T14:12:39.544Z |
| Node.js requirement | >=8.0.0 |
| Type declarations | Not declared |
| Runtime dependency count | 6 |
| Peer requirement count | 0 |
| Optional dependency count | 0 |
| Minified size | Measurement not available yet |
| Minified + gzip | Measurement not available yet |
| Unpacked distribution size | 68.68 KiB |
| Published file count | 13 |
| Package type | Not declared |
| ES module entry | Not declared |
| Default entry | lib/engine.io |
| Side effects declaration | Not declared |
| Direct advisories | 2 |
| Resolved graph dependencies | 16 |
| Repository stars | 63225 |
| Repository forks | 10218 |
Install engine.io 3.4.2
npm install engine.io@3.4.2 pnpm add engine.io@3.4.2 yarn add engine.io@3.4.2
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.
- accepts@1.3.8 — direct
- after@0.8.2 — indirect
- arraybuffer.slice@0.0.7 — indirect
- base64-arraybuffer@0.1.4 — indirect
- base64id@2.0.0 — direct
- blob@0.0.5 — indirect
- cookie@0.3.1 — direct
- debug@4.1.1 — direct
- engine.io-parser@2.2.1 — direct
- has-binary2@1.0.3 — indirect
- isarray@2.0.1 — indirect
- mime-db@1.52.0 — indirect
- mime-types@2.1.35 — indirect
- ms@2.1.3 — indirect
- negotiator@0.6.3 — indirect
- ws@7.5.13 — direct
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-Review | 1/10 — Found 3/30 approved changesets -- score normalized to 1 |
|---|---|
| Maintained | 10/10 — 30 commit(s) and 20 issue activity found in the last 90 days -- score normalized to 10 |
| Security-Policy | 10/10 — security policy file detected |
| Dangerous-Workflow | 10/10 — no dangerous workflow patterns detected |
| CII-Best-Practices | 0/10 — no effort to earn an OpenSSF best practices badge detected |
| Token-Permissions | 9/10 — detected GitHub workflow tokens with excessive permissions |
| Binary-Artifacts | 9/10 — binaries present in source code |
| License | 10/10 — license file detected |
| Fuzzing | 0/10 — project is not fuzzed |
| SAST | 0/10 — SAST tool is not run on all commits -- score normalized to 0 |
| Packaging | 10/10 — packaging workflow detected |
| Pinned-Dependencies | 2/10 — dependency not pinned by hash detected -- score normalized to 2 |
Evidence and freshness
- https://registry.npmjs.org/engine.io/3.4.2 — retrieved 2026-10-29T07:09:18.456Z
- https://api.deps.dev/v3/projects/github.com%2Fsocketio%2Fsocket.io — retrieved 2026-10-29T05:09:27.248Z
- https://api.deps.dev/v3/systems/npm/packages/engine.io/versions/3.4.2:dependencies — retrieved 2026-10-29T07:09:19.048Z
- https://api.deps.dev/v3/systems/npm/packages/engine.io/versions/3.4.2 — retrieved 2026-10-29T07:09:19.102Z