Secure Coding Practices in Node.js

1. Introduction

Secure coding practices are essential for developing robust applications. In Node.js, security is a critical aspect due to the widespread use of JavaScript and the exposure of web applications to various threats.

2. Common Vulnerabilities

• SQL Injection
• Cross-Site Scripting (XSS)
• Cross-Site Request Forgery (CSRF)
• Insecure Deserialization
• Denial-of-Service (DoS)

3. Best Practices

3.1 Input Validation

Always validate user inputs to prevent injection attacks. Use libraries such as validator for input validation.

const validator = require('validator');

const email = req.body.email;
if (!validator.isEmail(email)) {
    return res.status(400).send('Invalid email format');
}

3.2 Use Parameterized Queries

Prevent SQL injection by using parameterized queries with your database.

const query = 'SELECT * FROM users WHERE email = ?';
db.query(query, [email], (err, results) => {
    // Handle results
});

3.3 Implement Proper Error Handling

Do not expose stack traces or sensitive information in error messages. Always log errors securely.

3.4 Secure Dependencies

Use tools like npm audit to check for vulnerabilities in your dependencies.

3.5 Use HTTPS

Always serve your applications over HTTPS to protect data in transit.

3.6 Content Security Policy (CSP)

Implement a strict CSP to prevent XSS attacks by controlling resources the user agent is allowed to load.

3.7 Keep Software Updated

Regularly update your Node.js and dependencies to mitigate known vulnerabilities.

4. FAQ