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How do I secure an Express.js application?

Asked on Sep 22, 2025

Answer

Securing an Express.js application involves implementing various best practices to protect against common vulnerabilities. Here is a basic example of how to set up some security measures in an Express.js app.

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

        // Use Helmet to set various HTTP headers for security
        app.use(helmet());

        // Rate limiting to prevent brute-force attacks
        const limiter = rateLimit({
            windowMs: 15 * 60 * 1000, // 15 minutes
            max: 100 // limit each IP to 100 requests per windowMs
        });
        app.use(limiter);

        // Example route
        app.get('/', (req, res) => {
            res.send('Hello, secure world!');
        });

        app.listen(3000, () => {
            console.log('Server is running on port 3000');
        });

Additional Comment:

Use "helmet" to set secure HTTP headers, which helps protect against some well-known web vulnerabilities.
Implement rate limiting using "express-rate-limit" to mitigate brute-force attacks by limiting the number of requests from a single IP.
Always keep your dependencies up to date to avoid known vulnerabilities.
Consider using HTTPS to encrypt data in transit.
Validate and sanitize user inputs to prevent injection attacks.

✅ Answered with JavaScript best practices.

Ask any question about JavaScript here... and get an instant response.

How do I secure an Express.js application?

Asked on Sep 22, 2025

Answer

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