How can I build an API for a cryptocurrency exchange using Node.js and Express?

Use Node.js and Express to create RESTful APIs for handling trades, transactions, or user data:

const express = require('express');
const app = express();
const PORT = 3000;

app.use(express.json());

app.post('/trade', (req, res) => {
  const { userId, crypto, amount } = req.body;
  // Logic to handle trade
  res.json({ message: `Trade for ${amount} ${crypto} by user ${userId} processed.` });
});

app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});

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