Public Key Credentials

Public Key Credentials Overview

At its core, public key credentials 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 public key credentials pays off across the whole codebase: fewer surprises, easier testing, and smoother onboarding. The snippet below is a solid starting point.

import { generateAuthenticationOptions, verifyAuthenticationResponse }
  from '@simplewebauthn/server';

const options = await generateAuthenticationOptions({ rpID: 'example.com' });
// browser calls navigator.credentials.get(...)
const verification = await verifyAuthenticationResponse({
  response, expectedChallenge, expectedRPID: 'example.com', authenticator,
});

WebAuthn and passkeys replace passwords with device-bound public-key credentials.

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

Authentication Cheatsheet

Quick authentication reference related to public key credentials.

How Public Key Credentials Works

Public Key Credentials is part of proving who a user is and what they are allowed to do. Authentication verifies identity, while authorization decides access — and public key credentials plays a specific role in that flow.

WebAuthn and passkeys replace passwords with device-bound public-key credentials.

• 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 Public Key Credentials

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

Common Mistakes

• Skipping error handling and edge cases when wiring up public key credentials.
• Leaving public key credentials untested, so regressions slip into production.
• Over-engineering public key credentials before you actually need the extra flexibility.
• Ignoring documentation, which makes public key credentials hard for the next developer to change.

Key Takeaways

• Public Key Credentials is a core part of working effectively with authentication.
• Start small and keep public key credentials focused on a single responsibility.
• Apply consistent patterns so public key credentials scales across your project.
• Test and document public key credentials to keep it maintainable over time.