Security

Securing your Express application is crucial to prevent common vulnerabilities. Here are some best practices and tools to help with that.

a. Helmet

Helmet helps secure your Express apps by setting various HTTP headers.

npm install helmet

In your app.js:

const helmet = require('helmet');
app.use(helmet());

b. Rate Limiting

Limit the number of requests from a single IP to prevent abuse.

npm install rate-limit

In your app.js:

const rateLimit = require('express-rate-limit');

const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100 // Limit each IP to 100 requests per windowMs
});

app.use(limiter);

c. CORS (Cross-Origin Resource Sharing)

Control how your resources are shared across different origins.

npm install cors

In your app.js:

const cors = require('cors');
app.use(cors());

You can configure CORS to allow or block specific origins:

app.use(cors({
  origin: 'https://example.com'
}));