How to Implement Passkey Authentication in Next.js With SuperTokens

A complete self-hosted passkey implementation for a Next.js App Router application can use SuperTokens’ WebAuthn and Session recipes to handle relying-party responsibilities such as challenge generation, attestation validation, public-key storage, signature verification, and session issuance without sending credentials to a third-party identity provider. The setup centers on shared domain configuration, backend and frontend SDK initialization, and a catch-all API route under `/api/auth` that exposes SuperTokens authentication endpoints. Client-side helper methods manage registration and sign-in ceremonies by invoking the browser’s WebAuthn APIs while the SuperTokens Core verifies credentials and creates sessions; the SDK also avoids common binary-data serialization issues. Correct origin and relying-party ID configuration is essential because passkeys are bound to domains, while cross-device use is largely managed by browsers and operating systems through synced or hybrid credentials. The guide emphasizes planning recovery before launch through fallback factors, email-based recovery tokens, or multiple registered authenticators to prevent permanent lockouts. It also describes a gradual migration strategy in which passkeys coexist with password authentication and are linked to the same user account, allowing teams to adopt passkeys without immediately removing existing login methods.

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