Here's an example of an event-based solution in Node.js to handle MongoDB connection health checks: const EventEmitter = require('events'); const MongoClient = require('mongodb').MongoClient; const MONGO_URI = 'mongodb://localhost:27017/mydb'; class MongoDBHealthCheck extends EventEmitter { constructor() { super(); this.mongoClient = new MongoClient(MONGO_URI, { useNewUrlParser: true }); this.isHealthy = false; } start(

Here's an example of an express middleware that retrieves the IP address and user agent from a Mongoose collection called "Session" and compares it with the incoming request's user IP and user agent: const mongoose = require('mongoose'); const Session = mongoose.model('Session'); const verifySession = async (req, res, next) => { try { const

XPath (XML Path Language) is a query language used to navigate and select elements in an XML or HTML document. In JavaScript, you can use the document.evaluate() method to execute an XPath query and select elements in an HTML document. Here's an example of how to use XPath to

To delete a large file in Ubuntu, you can use the rm (remove) command in the terminal. Here's how to do it: 1. Open a terminal window. 2. Navigate to the directory containing the file you want to delete using the cd command. For example, if the file is located

To see how much free space is available in Linux, you can use the df (disk free) command. Here's how: 1. Open a terminal window. 2. Type the following command and press Enter: df -h The -h option will display the sizes in a human-readable format (e.g. "1.2G"