How to Build a Barcode, MRZ & Document Scanner Web App with React and JavaScript

Modern web applications increasingly need to capture and process identity documents, QR codes, and barcodes directly in the browser. The Dynamsoft Capture Vision (DCV) SDK provides vision pipelines for barcode reading, MRZ (Machine-readable Zone) recognition, and document boundary detection—all running client-side in WebAssembly. This tutorial shows you how to build a fully featured React application around the DCV SDK. You will learn how to manage SDK lifecycle state with hooks, wire up live camera streams and file uploads, and create an interactive document editor—all within a clean component architecture. Demo Video: React Barcode, MRZ & Document Scanner Prerequisites Before you start, make sure you have: Node.js 18+ and npm 9+ A free Dynamsoft trial license key Project Structure react/ ├── index.html # Vite entry – loads Dynamsoft CDN bundle ├── vite.config.js ├── package.json ├── public/ │ └── full.json # DCV template └── src/ ├── main.jsx # React tree bootstrap ├── App.jsx # Root