Abra-QR-dabra: Watch Passwordless Mobile Auth Magically Appear

A developer explored adding QR-based mobile authentication to a React/Express starter application, inspired by QR code design tools discussed on Hacker News. The proposed use case involves users who are already logged in on a desktop scanning a QR code to receive a passwordless magic-link login on their phone, potentially landing directly on a relevant setup or permissions page. The implementation adds a frontend QR page using the qrcode.react library, which requests a new mobile login link from a protected backend endpoint and renders that link as a QR code. The backend validates the existing user’s token, creates a magic link using the user’s email, and returns it as JSON. While presented as a minimal proof of concept, the approach could be integrated into onboarding flows or modals, enhanced with post-login redirects, and customized with more visually elaborate QR code designs.

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