Authentication Web Security

Web Security Overview

At its core, web security is about doing one thing well inside your authentication project. Once you understand the pattern, you can apply it consistently across features and teams.

Good web security pays off across the whole codebase: fewer surprises, easier testing, and smoother onboarding. The snippet below is a solid starting point.

import rateLimit from 'express-rate-limit';

const loginLimiter = rateLimit({
  windowMs: 15 * 60 * 1000,
  max: 5,
  message: 'Too many login attempts, try again later',
});

app.post('/login', loginLimiter, loginHandler);

Rate limiting login attempts is a first line of defence against brute-force attacks.

Web Security Example

// verify the caller on every protected request
function authenticate(req, res, next) {
  const token = req.headers.authorization?.replace('Bearer ', '');
  req.user = verifyToken(token); // throws if invalid
  next();
}

• Start from a minimal Web Security example and grow it only as needed.
• Keep configuration explicit so Web Security behaves the same in every environment.
• Name things clearly so teammates understand your Web Security at a glance.
• Add tests around Web Security early to lock in expected behaviour.

Authentication Cheatsheet

Quick authentication reference related to web security.

How Web Security Works

Web Security is part of proving who a user is and what they are allowed to do. Authentication verifies identity, while authorization decides access — and web security plays a specific role in that flow.

Rate limiting login attempts is a first line of defence against brute-force attacks.

• Never store or log plain-text passwords or secrets.
• Prefer short-lived tokens with refresh over long-lived ones.
• Always send credentials over HTTPS.
• Fail closed: deny access when anything is uncertain.

Security Guidance for Web Security

Security is the whole point of web security. Small mistakes — weak hashing, tokens in localStorage, missing rate limits — are exactly what attackers look for, so follow proven defaults.

Common Mistakes

• Copying web security snippets without understanding what each line does.
• Skipping error handling and edge cases when wiring up web security.
• Leaving web security untested, so regressions slip into production.
• Over-engineering web security before you actually need the extra flexibility.

Key Takeaways

• Web Security is a core part of working effectively with authentication.
• Start small and keep web security focused on a single responsibility.
• Apply consistent patterns so web security scales across your project.
• Test and document web security to keep it maintainable over time.