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Hashing Password with SHA-256 using 'crypto' module

// Import 'crypto' module
const crypto = require('crypto');

// Example password
const password = 'mypassword';

// Create SHA-256 hash of the password
const hash = crypto.createHash('sha256').update(password).digest('hex');

// Log the generated hash
console.log('Hash:', hash);

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cd node-rate-limiter
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Building a Real-Time Chat Application with WebSockets in Node.js

const express = require('express');
const http = require('http');
const socketIo = require('socket.io');

const app = express();
const server = http.createServer(app);
const io = socketIo(server);

app.use(express.static('public'));

io.on('connection', (socket) => {
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const PORT = process.env.PORT || 3000;
server.listen(PORT, () => console.log(`Server running on port ${PORT}`));
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Real-Time Chat</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
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</html>

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Simple RESTful API in Node.js using Express

// Import 'express' module
const express = require('express');
const app = express();

// Define a route for accessing a resource
app.get('/api/resource', (req, res) => {
  res.json({ message: 'Resource data' });
});

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  console.log('RESTful API is running on port 3000');
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Date Manipulation and Sum Calculation

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Set and Access Environment Variable

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File Stream Copy using 'fs' module

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Simple WebSocket Server using 'ws' library

// Import 'ws' module
const WebSocket = require('ws');

// Create WebSocket Server on port 8080
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// Event listener for new connections
wss.on('connection', (ws) => {
  // Event listener for incoming messages
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    console.log('Received:', message);
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