What is nodejs-express-server?

A guide to building Node.js servers with Express.js, a framework for handling web requests. It covers routes, middleware, authentication, databases, errors, and logging.

Use it to create REST APIs, route requests, add middleware, connect databases, authenticate users, and handle server errors.

It provides patterns for organizing request handling and shared server behavior as an application grows.

nodejs-express-server — Skill for Claude Code and Codex by aj-geddes

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.

Any agent

npx skills add aj-geddes/useful-ai-prompts --skill nodejs-express-server

Clone the repo

git clone --depth 1 https://github.com/aj-geddes/useful-ai-prompts

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/nodejs-express-server/github.svg)](https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/nodejs-express-server)

Your own site

<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.

Your own site · 80×15

<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>

Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 666 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. Third-party audits

Socket warn 14 Sept 2026
Snyk pass 14 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00043	$0.00666
Opus 5.5	$0.00017	$0.00266
Sonnet 5.5	$0.00009	$0.00133
Haiku 4.5	$0.00004	$0.00067

Measured 2mo ago against content hash db24461cdf82, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/security-checklist.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/nodejs-express-server/SKILL.md · 103 lines

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.

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

Read the full file on GitHub · 103 lines

Files

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.

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.

2mo ago First seen · 103 lines · 43 tokens per session scan A db24461cdf82

Subscribe to this mod's changes

nodejs-express-server is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (376 stars, last pushed 8mo ago), licensed MIT. It adds 43 tokens to every session and 666 once invoked, about $0.0002 per session on Opus 5.5. 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.

Backend and APIs

nodejs-express-server next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
nodejs-express-serveraj-geddes/useful-ai-prompts	Skill	376	8mo ago	MIT	A	43	Claude Code, Codex
mem0-oss-to-platformmem0ai/mem0	Skill	68k	2d ago	Apache-2.0	A	217	Claude Code, Codex
azure-mgmt-botservice-dotnetmicrosoft/skills	Skill	3.2k	yesterday	MIT	A	78	Claude Code
fastapi-router-pymicrosoft/skills	Skill	3.2k	yesterday	MIT	A	46	Claude Code
dev-runtimelangwatch/langwatch	Skill	5.0k	yesterday	Apache-2.0	A	172	Claude Code
api-designericrisco/rsc-harness	Skill	503	2d ago	MIT	A	105	Claude Code, Codex
migrate-segw-to-raparc-mcp/arc-1	Skill	252	yesterday	MIT	A	106	Claude Code

nodejs-express-server