A web app for generating and verifying QR code-based documents using the PERN stack, featuring an in-browser camera scanner and an admin analytics dashboard.
Explore the live production deployment or review source code repository.
Verifying the authenticity of printed credentials or certificates is often slow and manual, while digital verification typically requires downloading third-party scanning apps. Issuers also need a centralized portal to generate QR codes, set expiration parameters, and monitor scan logs securely.
As the Solo Full-Stack Developer, I developed the complete solution: • Backend & Database: Built REST APIs with Node.js/Express.js and designed PostgreSQL schemas on Supabase to manage QR codes, verification logs, and data exports (CSV/JSON). • Auth & Security: Implemented JWT and bcrypt for admin authentication, rate limiting (100 req/15 min), and Helmet HTTP security headers. • In-Browser Scanner: Integrated @zxing/library for direct webcam and mobile camera scanning without installing third-party apps. • Frontend: Built responsive interfaces with React 19, Vite, Tailwind CSS, and Zustand. • Deployment: Deployed to Vercel connected to Supabase PostgreSQL.
• Successfully deployed to production on Vercel and Supabase, processing 10+ live verification requests. • Enabled instant document verification directly in mobile and desktop browsers without third-party app installations. • Maintained a stable cloud posture with JWT authentication and rate limiting to safeguard against brute force attacks.
