# engine.io-parser@5.2.3 security report (npm)

- Verdict: **No issues** (risk level: safe)
- Scanned: 2026-10-04T16:28:28.000Z
- Files reviewed: 14
- Findings: no findings
- Report: https://security.togoder.click/npm/engine.io-parser
- Source: Togoder Security (https://security.togoder.click), AI source-code review

## Summary

Togoder Security scanned the npm package engine.io-parser@5.2.3 on Oct 4, 2026. An AI review of 14 source files produced no findings. No malicious behavior, install-time payloads, credential theft or exfiltration were identified.

## Findings

No findings.

## Files reviewed

- `build/cjs/commons.js` (safe): The file only defines static packet type constants and an error packet object with no network, filesystem, process, or dynamic execution behavior.
- `build/cjs/contrib/base64-arraybuffer.js` (safe): No malicious patterns detected; the file contains only a standard base64 encoding/decoding implementation with no network, filesystem, process, or dynamic code execution activity.
- `build/cjs/decodePacket.browser.js` (safe): No malicious patterns detected; the code is a standard packet decoder for a Socket.IO-like library with no data exfiltration, dynamic code execution, or suspicious behavior.
- `build/cjs/decodePacket.js` (safe): No malicious patterns detected; the code implements standard packet decoding for a Socket.IO-like protocol without any exfiltration, obfuscation, or dangerous behavior.
- `build/cjs/encodePacket.browser.js` (safe): No malicious patterns detected; the code performs standard packet encoding for the Socket.IO protocol using browser-native APIs without any external communication, credential access, dynamic code execution, or filesystem/process manipulation.
- `build/cjs/encodePacket.js` (safe): No malicious patterns detected; the code is a standard packet encoding utility using only Node.js core APIs for data serialization.
- `build/cjs/index.js` (safe): No malicious patterns detected
- `build/esm/commons.js` (safe): Cleared by Jev triage; no further analysis needed
- `build/esm/contrib/base64-arraybuffer.js` (safe): This is a standard base64 encode/decode implementation for ArrayBuffer with no malicious patterns, network calls, or environment access.
- `build/esm/decodePacket.browser.js` (safe): Cleared by Jev triage; no further analysis needed
- `build/esm/decodePacket.js` (safe): The code is a straightforward packet decoder for Socket.IO with no malicious patterns, external network calls, or dynamic code execution.
- `build/esm/encodePacket.browser.js` (safe): No malicious patterns detected; the code is a standard packet encoding utility for socket.io with no data exfiltration, credential harvesting, obfuscation, or suspicious behavior.
- `build/esm/encodePacket.js` (safe): Cleared by Jev triage; no further analysis needed
- `build/esm/index.js` (safe): No malicious patterns detected; the code implements packet encoding/decoding for the Socket.IO protocol using standard patterns.

AI analysis is guidance, not a guarantee. Methodology: https://security.togoder.click/methodology