engine.io 1.2.1
The realtime engine behind Socket.IO. Provides the foundation of a bidirectional connection between client and server
engine.io@1.2.1 was published on 2014-05-22. Its manifest declares 4 runtime dependencies and 0 peer requirements. Bundled type declarations are not declared in the inspected metadata. No Node.js engine requirement is declared in this manifest.
All engine.io versions · Permanent reference to 1.2.1 · Latest release
Package specifications
| Version | 1.2.1 |
|---|---|
| License declaration | Not declared |
| Published | 2014-05-22T16:07:56.824Z |
| Node.js requirement | Not declared |
| Type declarations | Not declared |
| Runtime dependency count | 4 |
| Peer requirement count | 0 |
| Optional dependency count | 0 |
| Minified size | Measurement not available yet |
| Minified + gzip | Measurement not available yet |
| Unpacked distribution size | Not supplied |
| Published file count | Not supplied |
| 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 | 13 |
| Repository stars | 63225 |
| Repository forks | 10218 |
Install engine.io 1.2.1
npm install engine.io@1.2.1 pnpm add engine.io@1.2.1 yarn add engine.io@1.2.1
Runtime dependencies
- ws 0.4.31
- debug 0.6.0
- base64id 0.1.0
- engine.io-parser 1.0.5
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.
- after@0.8.1 — indirect
- arraybuffer.slice@0.0.6 — indirect
- base64-arraybuffer@0.1.2 — indirect
- base64id@0.1.0 — direct
- blob@0.0.2 — indirect
- commander@0.6.1 — indirect
- debug@0.6.0 — direct
- engine.io-parser@1.0.5 — direct
- nan@0.3.2 — indirect
- options@0.0.6 — indirect
- tinycolor@0.0.1 — indirect
- utf8@2.0.0 — indirect
- ws@0.4.31 — 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/1.2.1 — retrieved 2026-10-29T07:08:53.201Z
- 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/1.2.1:dependencies — retrieved 2026-10-29T07:08:53.718Z
- https://api.deps.dev/v3/systems/npm/packages/engine.io/versions/1.2.1 — retrieved 2026-10-29T07:08:53.746Z