nodejs

nodejs is a cursor rule for Cursor from Renvia-code/best-cursor-rules. It costs 0 tokens per session (2,224 once invoked), scanned A, original, CC0-1.0.

A set of backend coding guidelines for Node.js, a runtime for running JavaScript outside a web browser. It covers web servers such as Express or Fastify, TypeScript, input validation, databases, project structure, errors, and asynchronous code.

In plain words
What is it for?
Use it when building or reviewing Node.js web backends, including routes, controllers, services, middleware, configuration, and API setup.
Why use it?
It gives a consistent way to organize server code and handle common concerns such as security middleware, request data, errors, and database access.

Cursor rule for Cursor

Written for Cursor: a Cursor rule (.mdc).

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is import { UserController } from '../controllers/users'.

Good fit Use it when building or reviewing Node.js web backends, including routes, controllers, services, middleware, configuration, and API setup.

Compare 6 cursor rules from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/Renvia-code/best-cursor-rules
agentmods
npx agentmods add rules/renvia-code/best-cursor-rules/nodejs

Made for: Cursor.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for nodejs

README.md
[![agentmods](https://agentmods.dev/badge/rules/renvia-code/best-cursor-rules/nodejs/github.svg)](https://agentmods.dev/rules/renvia-code/best-cursor-rules/nodejs)
Your own site
<a href="https://agentmods.dev/rules/renvia-code/best-cursor-rules/nodejs"><img src="https://agentmods.dev/badge/rules/renvia-code/best-cursor-rules/nodejs/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for nodejs

Your own site · 80×15
<a href="https://agentmods.dev/rules/renvia-code/best-cursor-rules/nodejs"><img src="https://agentmods.dev/badge/rules/renvia-code/best-cursor-rules/nodejs.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 2,224 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original 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 5.1 $0.00000 $0.02224
Opus 5.5 $0.00000 $0.00890
Sonnet 5.5 $0.00000 $0.00445
Haiku 4.5 $0.00000 $0.00222

Measured 1mo ago against content hash f4fa0c6d3b35, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

nodejs scanned grade A with 0 findings 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 1mo ago.

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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

rules/backends/nodejs.mdc · 439 lines

How it starts

The opening of the file, as written. The whole thing — 439 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Node.js Backend Best Practices

Overview

Aspect Recommendation
Runtime Node.js 20+ LTS
Framework Express or Fastify
Language TypeScript
Validation Zod
ORM Prisma or Drizzle

Project Structure

src/
├── index.ts             # Entry point
├── app.ts               # Express app setup
├── config/
│   └── index.ts         # Configuration
├── routes/
│   ├── index.ts         # Route aggregator
│   └── users.ts         # User routes
├── controllers/
│   └── users.ts         # Request handlers
├── services/
│   └── users.ts         # Business logic
├── middleware/
│   ├── auth.ts
│   └── errorHandler.ts
├── utils/
│   └── errors.ts
└── types/
    └── index.ts

Express Setup

Application

// src/app.ts
import express from 'express'
import cors from 'cors'
import helmet from 'helmet'
import { errorHandler } from './middleware/errorHandler'
import routes from './routes'

const app = express()

// Security middleware
app.use(helmet())
app.use(cors({ origin: process.env.CORS_ORIGIN }))

// Body parsing
app.use(express.json())
app.use(express.urlencoded({ extended: true }))

// Routes
app.use('/api', routes)

// Error handling (must be last)
app.use(errorHandler)

export default app

Entry Point

// src/index.ts
import app from './app'
import { config } from './config'

const server = app.listen(config.port, () => {
  console.log(`Server running on port ${config.port}`)
})

// Graceful shutdown
process.on('SIGTERM', () => {
  console.log('SIGTERM received, shutting down gracefully')
  server.close(() => {
    console.log('Server closed')
    process.exit(0)
  })
})

Routes and Controllers

Route Definition

// src/routes/users.ts
import { Router } from 'express'
import { UserController } from '../controllers/users'
import { authenticate } from '../middleware/auth'
import { validate } from '../middleware/validate'
import { createUserSchema, updateUserSchema } from '../schemas/user'

const router = Router()
const controller = new UserController()

router.get('/', controller.getAll)
router.get('/:id', controller.getById)
router.post('/', validate(createUserSchema), controller.create)
router.patch('/:id', authenticate, validate(updateUserSchema), controller.update)
router.delete('/:id', authenticate, controller.delete)

export default router

Read the full file on GitHub · 439 lines

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. 1mo ago First seen · 439 lines · 0 tokens per session scan A f4fa0c6d3b35

Subscribe to this mod's changes

nodejs is a cursor rule published in the GitHub repository Renvia-code/best-cursor-rules (13 stars, last pushed 10mo ago), licensed CC0-1.0. It costs nothing until one of its globs matches a file; then it loads 2,224 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.