Understanding the Code

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const express = require('express');: Imports the Express module.
const app = express();: Creates an Express application.
app.use(express.json());: Adds middleware to parse JSON request bodies.
app.get('/', (req, res) => {...});: Defines a route that handles GET requests to the root URL.
app.post('/data', (req, res) => {...});: Defines a route that handles POST requests to /data.
app.listen(port, () => {...});: Starts the server and listens on the specified port.

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