### Basic Dockerfile Example

Source: https://github.com/nilbuild/developer-roadmap/blob/master/src/data/question-groups/full-stack/content/docker-role.md

This Dockerfile sets up a Node.js environment, copies application code, installs dependencies, and defines the start command.

```dockerfile
FROM node:14
WORKDIR /app
COPY . .
RUN npm install
CMD ["npm", "start"]
```

--------------------------------

### Example: Start Caching Proxy

Source: https://github.com/nilbuild/developer-roadmap/blob/master/src/data/projects/caching-server.md

Example command to start the caching proxy on port 3000, forwarding requests to http://dummyjson.com.

```shell
caching-proxy --port 3000 --origin http://dummyjson.com
```

--------------------------------

### Node.js: Compare process.cwd() and __dirname

Source: https://github.com/nilbuild/developer-roadmap/blob/master/src/data/question-groups/nodejs/content/process-cwd-vs-dirname.md

Use process.cwd() to get the directory where the Node.js process was started and __dirname to get the directory of the current module. Note that these can differ depending on where the script is executed from.

```javascript
console.log(process.cwd());
// /Users/username/projects/nodejs

console.log(__dirname);
// /Users/username/projects/nodejs/src
```

--------------------------------

### Run Development Server

Source: https://github.com/nilbuild/developer-roadmap/blob/master/readme.md

Start the development server for the developer-roadmap project using the pnpm dev command. Remember to configure your environment variables by renaming .env.example to .env.

```bash
pnpm dev
```

--------------------------------

### Run Development Server

Source: https://github.com/nilbuild/developer-roadmap/blob/master/contributing.md

Command to start the local development server after setting up the project.

```bash
pnpm dev
```

--------------------------------

### WebSocket Server Setup with Socket.IO

Source: https://github.com/nilbuild/developer-roadmap/blob/master/src/data/question-groups/full-stack/content/real-time-updates.md

Set up a Socket.IO server to handle WebSocket connections and broadcast messages. This example assumes an existing HTTP server.

```javascript
const io = require('socket.io')(server);
io.on('connection', (socket) => {
  socket.on('chat message', (msg) => io.emit('chat message', msg));
});
```

--------------------------------

### Onboard Open Claw

Source: https://github.com/nilbuild/developer-roadmap/blob/master/src/data/roadmaps/openclaw/content/installation@2JiT8CS9PSVSfIeao29hq.md

After installation, run this command to connect your first model and channel with Open Claw.

```bash
openclaw onboard
```

--------------------------------

### Application-Level Middleware in Express.js

Source: https://github.com/nilbuild/developer-roadmap/blob/master/src/data/question-groups/nodejs/content/middleware-pattern.md

Illustrates how to apply middleware to all requests or specific route patterns. The first example adds a timestamp to the request object, while the second targets requests starting with '/api'.

```javascript
const app = express();

// Runs for ALL requests
app.use((req, res, next) => {
  req.requestTime = Date.now();
  next();
});

// Runs only for /api/* routes
app.use('/api', (req, res, next) => {
  console.log('API request');
  next();
});
```

--------------------------------

### Clone Repository and Install Dependencies

Source: https://github.com/nilbuild/developer-roadmap/blob/master/contributing.md

Use these commands to clone the repository and install project dependencies locally for development.

```bash
git clone git@github.com:nilbuild/developer-roadmap.git --depth 1
cd developer-roadmap
pnpm add @roadmapsh/editor@npm:@roadmapsh/dummy-editor -w
pnpm install
```

--------------------------------

### SQL ROW_NUMBER() Function Example

Source: https://github.com/nilbuild/developer-roadmap/blob/master/src/data/question-groups/sql-queries/content/rank-dense-rank-row-number.md

Use ROW_NUMBER() to assign a unique sequential integer to each row, starting with 1, based on the order specified in the OVER clause. Ties do not affect the uniqueness of the assigned number.

```sql
SELECT
  id,
  day,
  amount,
  ROW_NUMBER() OVER (ORDER BY amount DESC) AS rowNumber
FROM
  sales;
```

--------------------------------

### Run Angular Development Server

Source: https://github.com/nilbuild/developer-roadmap/blob/master/src/data/roadmaps/angular/content/setting-up-a-new-project@EbFRcy4s6yzzIApBqU77Y.md

Navigate to your project directory and start the development server. This command compiles the application and serves it locally, typically at http://localhost:4200/.

```bash
cd your-project-name
ng serve
```

--------------------------------

### CI/CD Security Check with GitHub Actions

Source: https://github.com/nilbuild/developer-roadmap/blob/master/src/data/question-groups/nodejs/content/npm-package-security.md

Integrate security checks into your CI/CD pipeline using GitHub Actions. This example sets up Node.js, installs dependencies, runs `npm audit`, and uses the Snyk action.

```yaml
# GitHub Actions example
name: Security Check

on: [push, pull_request]

jobs:
  security:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      
      - name: Setup Node
        uses: actions/setup-node@v3
        with:
          node-version: '18'
          
      - name: Install dependencies
        run: npm ci
        
      - name: Run security audit
        run: npm audit --audit-level=high
        
      - name: Run Snyk
        uses: snyk/actions/node@v1.1234.0  # Use specific version tag, not master
        env:
          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
```