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App

The Interopchain web application — a browser-based interface that allows users to interact with the Hyperledger Fabric blockchain via the NodeJS backend server.

Features

  • Authentication — user registration and log-in flows.
  • Blockchain data display — query and display HL7 FHIR data returned by Smart Contracts (chaincodes).
  • QR Code reader — scan QR codes to retrieve patient identifiers or transaction references.
  • Transaction signing — review and sign blockchain transactions before submission.
  • Server communication — all blockchain interactions are proxied through the NodeJS server REST API.

Prerequisites

  • Node.js ≥ 18 LTS
  • The NodeJS server running (see server/)

Getting Started

cd app
cp .env.example .env        # Edit .env with your configuration
npm install
npm start

The application is available at http://localhost:3001 by default.

Project Structure

app/
├── src/
│   ├── index.js            # Application entry point
│   ├── components/         # Reusable UI components
│   │   ├── Auth/           # Login and registration forms
│   │   ├── Dashboard/      # Blockchain data display
│   │   ├── QRCodeReader/   # QR code scanning component
│   │   └── TransactionSigner/ # Transaction review and signing
│   ├── services/           # API client for the server
│   └── App.js              # Root application component
├── public/
├── .env.example
├── package.json
└── README.md

Environment Variables

Variable Description Default
REACT_APP_API_URL Base URL of the NodeJS server REST API http://localhost:3000
PORT Port for the development server 3001