DeveloperBreeze

Simple RESTful API in Node.js using Express

January 26, 2024

javascript

// 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' });
});

// Start the server and listen on port 3000
app.listen(3000, () => {
  console.log('RESTful API is running on port 3000');
});

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Building a Real-Time Chat Application with WebSockets in Node.js

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.chat-container {
    background-color: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 300px;
}

#messages {
    list-style-type: none;
    padding: 0;
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 10px;
}

#messages li {
    padding: 8px;
    background-color: #f1f1f1;
    border-radius: 3px;
    margin-bottom: 5px;
}

#chat-form {
    display: flex;
}

#message {
    flex: 1;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 3px;
    margin-right: 5px;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 3px;
    padding: 8px 12px;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

const socket = io();

const messageForm = document.getElementById('chat-form');
const messageInput = document.getElementById('message');
const messagesList = document.getElementById('messages');

messageForm.addEventListener('submit', (e) => {
    e.preventDefault();
    const message = messageInput.value;
    socket.emit('chatMessage', message);
    messageInput.value = '';
});

socket.on('chatMessage', (message) => {
    const li = document.createElement('li');
    li.textContent = message;
    messagesList.appendChild(li);
});

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

// Read a file
fs.readFile('file.txt', 'utf8', (err, data) => {
  if (err) throw err;
  console.log(data);
});

// Write to a file
fs.writeFile('newfile.txt', 'Hello, Node.js!', (err) => {
  if (err) throw err;
  console.log('File written successfully.');
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Date Manipulation and Sum Calculation

// Import required modules
const moment = require('moment');
const _ = require('lodash');

// Get the current date and time using Moment.js
const now = moment();

// Example array of numbers
const numbers = [1, 2, 3, 4, 5];

// Calculate the sum of the array using Lodash
const sum = _.sum(numbers);

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Access Command-line Arguments

// Access command-line arguments excluding the first two elements (node and script path)
const args = process.argv.slice(2);

// Log the command-line arguments
console.log('Command-line arguments:', args);

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