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.
npx agentmods add rules/mitas/cursor-rules/node-expressgit clone --depth 1 https://github.com/mitas/cursor-rulesWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00423 | $0.00423 |
| Opus 5 | $0.00211 | $0.00211 |
| Sonnet 5 | $0.00085 | $0.00085 |
| Haiku 4.5 | $0.00042 | $0.00042 |
Grade A, and why
node-express 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 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.
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.
This is a copy
86% identical to node-express — 8 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
description: Node.js and Express.js best practices for backend development globs: /.js, **/.ts, src//*.ts
Node.js and Express.js Best Practices
Project Structure
- Use proper directory structure
- Implement proper module organization
- Use proper middleware organization
- Keep routes organized by domain
- Implement proper error handling
- Use proper configuration management
Express Setup
- Use proper middleware setup
- Implement proper routing
- Use proper error handling
- Configure proper security middleware
- Implement proper validation
- Use proper static file serving
API Design
- Use proper REST principles
- Implement proper versioning
- Use proper request validation
- Handle errors properly
- Implement proper response formats
- Document APIs properly
Database Integration
- Use proper ORM/ODM
- Implement proper migrations
- Use proper connection pooling
- Implement proper transactions
- Use proper query optimization
- Handle database errors properly
Authentication
- Implement proper JWT handling
- Use proper password hashing
- Implement proper session management
- Use proper OAuth integration
- Implement proper role-based access
- Handle auth errors properly
Security
- Use proper CORS setup
- Implement proper rate limiting
- Use proper security headers
- Implement proper input validation
- Use proper encryption
- Handle security vulnerabilities
Performance
- Use proper caching
- Implement proper async operations
- Use proper connection pooling
- Implement proper logging
- Use proper monitoring
- Handle high traffic properly
Testing
- Write proper unit tests
- Implement proper integration tests
- Use proper test runners
- Implement proper mocking
- Test error scenarios
- Use proper test coverage
Deployment
- Use proper Docker setup
- Implement proper CI/CD
- Use proper environment variables
- Configure proper logging
- Implement proper monitoring
- Handle deployment errors
Best Practices
- Follow Node.js best practices
- Use proper async/await
- Implement proper error handling
- Use proper logging
- Handle process signals properly
- Document code properly
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.
- yesterday First seen · 86 lines · 423 tokens per session scan A fd5e837fe639
node-express is a cursor rule published in the GitHub repository mitas/cursor-rules (2 stars, last pushed 1y ago), licensed MIT. It adds 423 tokens to every session, about $0.0021 per session on Opus 5. A static security scan graded it A with 0 findings. It is 86% identical to node-express, differing in 8 lines, and is treated as a copy.
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