NodeJs — Building a dApp Backend

A decentralized application (dApp) often needs a traditional backend to store off-chain data, user authentication, and interactions with the blockchain network.

// Example: Backend endpoint for blockchain data
const express = require('express');
const app = express();

app.get('/balance/:address', async (req, res) => {
  const balance = await web3.eth.getBalance(req.params.address);
  res.json({ balance });
});

app.listen(3000, () => console.log('dApp backend running on port 3000'));