Question 1

OAuth 2.0 vs OpenID Connect, what's the difference?

Accepted Answer

OAuth 2.0 is delegation: gives apps permission to access your data (identity provider doesn't authenticate you). OpenID Connect (OIDC) layers authentication on top: proves who you are + provides an ID token with claims. Use OAuth for third-party API access. Use OIDC for user login (SSO). Enterprise SSO = OIDC + SAML hybrid.

Question 2

Should I use Auth0/Clerk or build my own authentication?

Accepted Answer

Auth0/Clerk/WorkOS unless you have 50k+ users and specific compliance needs (HIPAA/PCI). Managed providers handle: password resets, MFA, bot detection, compliance audits, breach response, updates. Roll-your-own costs 3-6 engineers + $50k/year compliance. Clerk best for SaaS startups; Auth0 for enterprise; Okta for organizations with legacy systems.

Question 3

JWT vs session cookies, when do I pick each?

Accepted Answer

Sessions (cookie + server-side store): simpler, session revocation instant, best for web browsers, vulnerable to CSRF (mitigate with SameSite). JWT: stateless, API-friendly, scales horizontally, can't revoke instantly (expiry window = vulnerability). Hybrid: use both, cookie with short-lived JWT refresh token for APIs, session for browsers.

Question 4

RBAC vs ABAC, when does each make sense?

Accepted Answer

RBAC (Role-Based): user has role (admin/editor/viewer) → fixed permissions. Simple, fast, scales to 100s of roles. ABAC (Attribute-Based): rules evaluated per request (e.g., allow if owner=requester AND time<18:00). Flexible, auditable, slower. Start RBAC; add ABAC rules only when RBAC becomes unwieldy (>20 roles or complex approval workflows).

Question 5

How do I store passwords securely?

Accepted Answer

NEVER store plaintext or use MD5/SHA1. Use bcrypt (12+ rounds), scrypt, or Argon2. Hash + salt at rest. Let OAuth/OIDC providers handle it. If you must: Argon2id (best, OWASP recommendation), bcrypt (proven, slower = harder to crack), PBKDF2 (acceptable, NIST-approved). Implement rate limiting on login attempts (5 tries in 15 min → lock 30 min).

Question 6

How do I set up single sign-on (SSO) with SAML?

Accepted Answer

SAML 2.0 flow: user visits your app → redirected to enterprise IdP (Okta/Azure AD) → IdP authenticates → posts signed SAML assertion back to your app → app verifies signature + extracts claims (email, name, groups). Use `@node-saml/node-saml` or use Okta SDK. Enterprise loves SAML; never roll it yourself (signature validation = crypto gotchas).

Question 7

Magic links vs passwords, should I ditch passwords?

Accepted Answer

Magic links (email or SMS OTP): no password to steal, mobile-friendly, passwordless phishing impossible. But email/SMS hijacking = still vulnerable. Best: passwordless default + password option as backup, or passkeys (WebAuthn) + magic link. Implementation: generate short token, email link with `?code=xyz`, verify token expires in 10-15 min, set session. Cost: ~$0.01/email via SendGrid.

प्रदेश	ज्युनियर	मध्यम	सीनियर
USA	$100k	$145k	$190k
UK	£55k	£80k	£115k
EU	€60k	€85k	€125k
CANADA	C$105k	C$150k	C$200k

Authentication & Authorization (OAuth, JWT, SSO)

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