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code-review-nodejs

Security review of Node.js / JavaScript code — dangerous sinks and Express/framework pitfalls. Load when reviewing a Node/JS codebase/PR, on package.json + Express/Next/Nest, or "review this Node app". Signals: child_process, eval, Function, prototype pollution, JWT, Mongoose/Sequelize.

skills/code-review/code-review-nodejs/SKILL.md

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Repository last updated: Oct 14, 2026
License: MIT

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# Node.js / JavaScript security code review

## When it applies
Reading Node/JS source (Express, Next.js, NestJS, a package). Language companion to
`code-review-methodology` — the exact sinks and framework gotchas to grep and trace.

## Sinks & patterns (grep, then trace to user input)
- **Command exec**: `child_process.exec`/`execSync` with user input (use `execFile`/`spawn` w/ arg array);
  template strings in commands.
- **Code eval**: `eval`, `new Function`, `vm.runIn…`, `setTimeout("string")` — RCE.
- **Prototype pollution**: recursive merge/`Object.assign`/`lodash.merge`/`set`, `JSON.parse` into
  object merges, query parsers — `__proto__`/`constructor` keys (→ `web-prototype-pollution`).
- **SQL/NoSQL**: string-built SQL; Mongo queries taking raw `req.body`/`req.query` (operator injection
  `{$gt:''}`); Sequelize `.query()`/`literal`.