JavaScript_Node.js_rules

Security rules for JavaScript and Node.js applications, with Node.js being a runtime for running JavaScript outside a web browser.

In plain words
What is it for?
Use them when generating or reviewing Node.js services, APIs, and other JavaScript application code.
Why use it?
They help reduce common security mistakes in server-side JavaScript code.

Cursor rule

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/wiz-sec-public/secure-rules-files/javascript_node.js_rules
Clone the repo
git clone --depth 1 https://github.com/wiz-sec-public/secure-rules-files
Per session 1,097 This file is loaded in full into every session.
When invoked 1,097 The same file — it is already loaded in full.
Security scan A 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.01097 $0.01097
Opus 5 $0.00549 $0.00549
Sonnet 5 $0.00219 $0.00219
Haiku 4.5 $0.00110 $0.00110

Measured yesterday against content hash fb393d8e23f5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

JavaScript_Node.js_rules scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

**Mitigation Rule:** When executing external commands using Node.js `child_process` module, prefer `child_process.spawn()` with an array of arguments over `child_process.exec()` or `child_process.execSync()`. Never pass
javascript/node.js/JavaScript_Node.js_rules.mdc · 42 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 42 lines · 1,097 tokens per session scan A fb393d8e23f5

Subscribe to this mod's changes

JavaScript_Node.js_rules is a cursor rule published in the GitHub repository wiz-sec-public/secure-rules-files (239 stars, last pushed 8mo ago), with no licence file. It adds 1,097 tokens to every session, about $0.0055 per session on Opus 5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.