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 skills add aj-geddes/useful-ai-prompts --skill nodejs-express-servergit clone --depth 1 https://github.com/aj-geddes/useful-ai-promptsWrote 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.
[](https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/nodejs-express-server)<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/nodejs-express-server"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/nodejs-express-server/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.
<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/nodejs-express-server"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/nodejs-express-server.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk fail
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00043 | $0.00666 |
| Opus 5 | $0.00022 | $0.00333 |
| Sonnet 5 | $0.00009 | $0.00133 |
| Haiku 4.5 | $0.00004 | $0.00067 |
Grade A, and why
nodejs-express-server 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Node.js Express Server
Table of Contents
Overview
Create robust Express.js applications with proper routing, middleware chains, authentication mechanisms, and database integration following industry best practices.
When to Use
- Building REST APIs with Node.js
- Implementing server-side request handling
- Creating middleware chains for cross-cutting concerns
- Managing authentication and authorization
- Connecting to databases from Node.js
- Implementing error handling and logging
Quick Start
Minimal working example:
const express = require("express");
const app = express();
const PORT = process.env.PORT || 3000;
// Middleware
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
// Routes
app.get("/health", (req, res) => {
res.json({ status: "OK", timestamp: new Date().toISOString() });
});
// Error handling
app.use((err, req, res, next) => {
console.error(err.stack);
res.status(err.status || 500).json({
error: err.message,
requestId: req.id,
});
});
app.listen(PORT, () => {
console.log(`Server running on port ${PORT}`);
});
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Basic Express Setup | Basic Express Setup |
| Middleware Chain Implementation | Middleware Chain Implementation |
| Database Integration (PostgreSQL with Sequelize) | Database Integration (PostgreSQL with Sequelize) |
| Authentication with JWT | Authentication with JWT |
| RESTful Routes with CRUD Operations | RESTful Routes with CRUD Operations |
| Error Handling Middleware | Error Handling Middleware |
| Environment Configuration | Environment Configuration |
What ships with it
8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/authentication-with-jwt.md 832 B
- references/basic-express-setup.md 626 B
- references/database-integration-postgresql-with-sequelize.md 830 B
- references/environment-configuration.md 462 B
- references/error-handling-middleware.md 877 B
- references/middleware-chain-implementation.md 999 B
- references/restful-routes-with-crud-operations.md 1.7 KB
- scripts/security-checklist.sh 734 B runs code
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.
- 9d ago First seen · 103 lines · 43 tokens per session scan A db24461cdf82
nodejs-express-server is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (338 stars, last pushed 6mo ago), licensed MIT. It adds 43 tokens to every session and 666 once invoked, about $0.0002 per session on Opus 5. 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 2026-09-03.
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