modern-auth-2026

Implement passkeys and WebAuthn in Next.js by creating server-side challenge endpoints, storing public keys in a dedicated credentials table, and verifying authenticator counters during the login flow. Supabase handles session management and secure data storage.

The best way to replace password logins in Supabase is using a passwordless-first architecture combining passkeys for primary sign-in, OAuth for social fallback, and short-lived magic links for email recovery to reduce phishing and account takeover risk.

Supabase supports passwordless authentication including passkeys, OAuth providers like Google and Apple, and magic links. It manages database schemas, RLS policies for credential rows, and session exchange patterns for both web and mobile apps.

Handle cross-device passkey sync using platform vs cross-platform attachments and QR hybrid flows for devices lacking local credentials. Manage account recovery via an email recovery hierarchy with short-lived magic links and backup passkeys.

You can use passkeys as a second factor for MFA alongside TOTP patterns in Supabase. This involves configuring multi-factor authentication flows that verify server-generated short-lived challenges during the WebAuthn authentication process.

WebAuthn credential storage in Supabase requires a passkey_credentials table with strict Row Level Security policies to secure public-key rows. This ensures only authenticated users can access or update their credential data during passkey registration and authentication.