Identity Providers

Identity Providers Overview

Identity Providers lets you structure authentication work so it stays readable, testable, and easy to scale. Instead of ad-hoc code, you follow a clear pattern that other developers can recognise immediately.

The key is to keep identity providers focused and predictable. Start from the minimal example here, then layer in only the complexity your feature actually needs.

import { Issuer } from 'openid-client';

const issuer = await Issuer.discover('https://accounts.example.com');
const client = new issuer.Client({
  client_id: CLIENT_ID,
  client_secret: CLIENT_SECRET,
  redirect_uris: [REDIRECT_URI],
  response_types: ['code'],
});

OpenID Connect adds an identity layer on OAuth; discovery auto-configures the client.

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

Authentication Cheatsheet

Quick authentication reference related to identity providers.

How Identity Providers Works

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

OpenID Connect adds an identity layer on OAuth; discovery auto-configures the client.

• 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 Identity Providers

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

Common Mistakes

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

Key Takeaways

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