Web Security Essentials for Modern Apps

Security must be a priority from day one.

OWASP Top 10

1. Broken Access Control
2. Cryptographic Failures
3. Injection attacks
4. Insecure Design
5. Security Misconfiguration

Authentication Best Practices

Password Storage

import bcrypt from 'bcrypt';
const SALT_ROUNDS = 12;
async function hashPassword(password) {
  return bcrypt.hash(password, SALT_ROUNDS);
}

JWT Security

• Use short-lived tokens (15 minutes)
• Implement refresh token rotation
• Store in httpOnly cookies, not localStorage
• Always validate iss and aud claims

Quick Wins

1. Enable HTTPS everywhere
2. Sanitize user input
3. Keep dependencies updated
4. Implement rate limiting
5. Log security events