Basics Pdf - Node.js Beyond The

mkdir myproject cd myproject npm init

const assert = require('assert'); const greet = require('./greet');

Node.js is built around asynchronous programming using callbacks, promises, and async/await. Understanding how to work with asynchronous code is crucial for building efficient and scalable applications. node.js beyond the basics pdf

Node.js provides a built-in module system that allows developers to organize and reuse code. Dependencies can be managed using npm or yarn.

Node.js provides various libraries for authentication and authorization, including Passport.js. mkdir myproject cd myproject npm init const assert

// Using callbacks fs.readFile('file.txt', (err, data) => { if (err) { console.error(err); } else { console.log(data.toString()); } });

const mongoose = require('mongoose'); mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true }); Dependencies can be managed using npm or yarn

const user = new User({ name: 'John', age: 30 }); user.save((err) => { if (err) { console.error(err); } else { console.log('User saved successfully'); } });

passport.use(new LocalStrategy((username, password, done) => { // Verify user credentials if (username === 'john' && password === 'password') { return done(null, { username: 'john' }); } else { return done(null, false); } }));