Create blockchain.js

routes/blockchain.js

@@ -0,0 +1,32 @@
+import express from 'express';
+import Web3 from 'web3';
+import { abi, bytecode } from '../contracts/MyContract';
+
+const router = express.Router();
+const web3 = new Web3(new Web3.providers.HttpProvider('https://mainnet.infura.io/v3/YOUR_PROJECT_ID'));
+
+router.post('/deploy-contract', async (req, res) => {
+  const { from, gas, gasPrice } = req.body;
+  const contract = new web3.eth.Contract(abi);
+  const deployTx = contract.deploy({ data: bytecode, arguments: [] });
+  const txCount = await web3.eth.getTransactionCount(from);
+  const tx = {
+    from,
+    gas,
+    gasPrice,
+    data: deployTx.encodeABI(),
+    nonce: web3.utils.toHex(txCount),
+  };
+  const signedTx = await web3.eth.accounts.signTransaction(tx, '0xYOUR_PRIVATE_KEY');
+  const receipt = await web3.eth.sendSignedTransaction(signedTx.rawTransaction);
+  res.json({ contractAddress: receipt.contractAddress });
+});
+
+router.post('/interact-contract', async (req, res) => {
+  const { contractAddress, functionName, args } = req.body;
+  const contract = new web3.eth.Contract(abi, contractAddress);
+  const result = await contract.methods[functionName](...args).call();
+  res.json({ result });
+});
+
+export default router;