claude-config/skills/nodejs.md

Node.js & JavaScript Skill

Installed Versions

• Node.js 20.x
• npm 10.x
• Claude Code CLI

Common Commands

Project Initialization

npm init -y                    # Initialize package.json
npm install express            # Install dependency
npm install -D nodemon        # Install dev dependency
npm install --save-exact       # Install exact version

Development

npm start                       # Start app
npm run dev                    # Start with hot reload
npm test                        # Run tests
npm run build                   # Build for production
npm outdated                    # Check for updates
npm update                      # Update dependencies

Docker for Node

# Basic Dockerfile
FROM node:20-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY . .
EXPOSE 3000
CMD ["npm", "start"]

Project Templates

Express API

const express = require('express');
const app = express();
const port = 3000;

app.use(express.json());
app.get('/', (req, res) => res.send('Hello'));
app.listen(port, () => console.log(`Server on ${port}`));

Fast Setup

npx create-next-app myapp        # Next.js
npx create-react-app myapp       # React
npx create-vue-app myapp         # Vue

Best Practices

• Use npm ci instead of npm install in CI/CD
• Use package-lock.json for reproducible builds
• Define scripts in package.json for common tasks
• Use environment variables with dotenv