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app.js

+const express = require('express');
+const Web3 = require('web3');
+const contractAbi = [/* Paste the ABI of the SupplyChain contract here */];
+const contractAddress = '0x...'; // Paste the address of the deployed contract here
+
+const web3 = new Web3('http://localhost:8545'); // Update the URL if using a different Ethereum node
+
+const supplyChainContract = new web3.eth.Contract(contractAbi, contractAddress);
+
+const app = express();
+app.set('view engine', 'ejs');
+app.use(express.urlencoded({ extended: true }));
+
+app.get('/', (req, res) => {
+    res.render('index');
+});
+
+app.post('/create-item', async (req, res) => {
+    const { name, quantity } = req.body;
+    const accounts = await web3.eth.getAccounts();
+    await supplyChainContract.methods.createItem(name, quantity).send({ from: accounts[0] });
+    res.redirect('/');
+});
+
+app.post('/mark-in-transit', async (req, res) => {
+    const { itemId } = req.body;
+    const accounts = await web3.eth.getAccounts();
+    await supplyChainContract.methods.markItemInTransit(itemId).send({ from: accounts[0] });
+    res.redirect('/');
+});
+
+app.post('/mark-delivered', async (req, res) => {
+    const { itemId } = req.body;
+    const accounts = await web3.eth.getAccounts();
+    await supplyChainContract.methods.markItemDelivered(itemId).send({ from: accounts[0] });
+    res.redirect('/');
+});
+
+app.listen(3000, () => {
+    console.log('Server is running on port 3000');
+});
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