⬡ ChainScan — Multi-Role QR Blockchain System

Ek hi QR code scan karo — alag role = alag data!

Requirements

• Node.js: https://nodejs.org
• MongoDB: https://www.mongodb.com/try/download/community

Setup

Step 1 - Clone karo

git clone https://github.com/Harshal2007vk/chainscan.git cd chainscan

Step 2 - Install karo (3 alag terminals)

cd blockchain && npm install cd backend && npm install cd frontend && npm install

Step 3 - Blockchain start karo (band mat karna!)

cd blockchain npx hardhat node

Step 4 - Contract deploy karo (naye terminal mein)

cd blockchain npx hardhat run scripts/deploy.js --network localhost

Step 5 - Demo users banao

cd backend node seed.js

Step 6 - Backend start karo (band mat karna!)

cd backend npm run dev

Step 7 - Frontend start karo

cd frontend npm start

Browser: http://localhost:3000

Login

• supplier@demo.com / demo1234
• wholesaler@demo.com / demo1234
• customer@demo.com / demo1234

Test

Manual tab mein PROD-001 ya PROD-002 type karo → Verify dabao

Role-wise Data

Field	Customer	Wholesaler	Supplier
Name	✅	✅	✅
Origin	✅	❌	✅
Expiry	✅	✅	✅
Shipment	❌	✅	✅
Bulk Price	❌	✅	✅
Cost Price	❌	❌	✅
Scan Logs	❌	❌	✅
Generate QR	❌	❌	✅