OpenJS Node.js Application Developer (JSNAD) Certification Guide 2024 (Loira Venith) (Z-Library)

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OpenJS Node.js Application Developer (JSNAD) Certification Guide A complete practical study guide to become a node.js certified developer with 100+ sample programs demonstrated Liora Venith

Preface Get certified in Node.js application development and take your career to the next level! The JSNAD certification is your ticket to proving your deep understanding and proficiency in Node.js application development. This fantastic book is perfect for anyone aiming to ace the JSNAD exam. The book is packed with essential Node.js concepts, including asynchronous programming, middleware integration, and advanced routing techniques. This is your chance to get to grips with the core aspects of Node.js and build a solid foundation! And there's more! You'll also learn about testing strategies, deployment methodologies, and performance optimization. This book includes quick reference guides and a glossary of advanced terms, making it easy to revisit key concepts and really cement your understanding. You'll also find lots of practical exercises and knowledge checks throughout the book, which are great for checking your understanding and spotting areas you can improve on. And there's more! You'll also find detailed explanations of complex topics that demystify intricate Node.js functionalities, making them accessible and comprehensible. And there's more! The book also offers access to sample

projects and code repositories, providing hands-on experience that mirrors the scenarios encountered in the certification exam. These projects are the perfect chance for learners to put their new skills into practice, building amazing, robust Node.js applications that can scale to any challenge! In this book you will learn how to: Master Node.js architecture and the event-driven, non-blocking I/O model. Master asynchronous programming using callbacks, promises, and async/await. Implement a robust middleware solution for efficient request handling in Express.js. Write unit tests using Mocha and Chai to ensure your code is reliable. Use Jest to test the full range of Node.js applications. Set up secure environment variables for different stages of deployment. Profile and manage your applications' memory to improve performance. Deploy your Node.js applications using PM2 and configure Nginx as a reverse proxy. Create CI/CD pipelines with GitHub Actions for automated testing and deployment.

Prologue When I first decided to pursue the JSNAD certification, I was thrilled and a little daunted by the incredible scope of knowledge it would bring me. I was excited to dive into the world of asynchronous programming and middleware integration, as well as the challenge of deploying applications and optimizing performance. I knew I needed a structured approach that would not only cover the theoretical aspects but also provide practical insights to help me tackle the exam with confidence. That's why I've crafted this book—to bridge that gap! I dove deep into the core concepts of Node.js, making sure that each chapter built upon the previous one. This created a cohesive and comprehensive learning experience that I'm really excited to share with you! The good news is that I'm going to share the very strategies that helped me navigate complex topics, the resources that were absolutely invaluable during my preparation, and the common pitfalls to avoid. I wanted to create a roadmap that would guide aspiring developers through their certification journey with clarity and assurance. I've packed this book with all the details you need to know, plus real-world examples and practical exercises to help you really understand the concepts. I've made sure you have all the

tools you need to revise quickly and understand even the trickiest concepts with quick reference guides and a glossary of advanced terms. And that's not all! I've also included sample projects and code repositories that mirror the types of challenges you'll face on the certification exam and in professional development environments. Working through these examples has been an amazing way for me to apply theoretical knowledge in a practical context, and I know you'll feel the same! The more you dive into "JSNAD Certification Preparation," the more you'll see how engaging the material is! I really encourage you to take the time to work through the exercises, explore the sample projects, and reflect on the strategies discussed. It's a great way to really get the most out of the book! This book is so much more than just a study aid! It's a fantastic companion designed to support you every step of the way toward achieving your certification goals. I know how hard you're working to get your JSNAD certification. That's why I created this book—to make your journey as smooth and effective as possible! - Venith

Copyright © 2024 by GitforGits All rights reserved. This book is protected under copyright laws and no part of it may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without the prior written permission of the publisher. Any unauthorized reproduction, distribution, or transmission of this work may result in civil and criminal penalties and will be dealt with in the respective jurisdiction at anywhere in India, in accordance with the applicable copyright laws. Published by: GitforGits Publisher: Sonal Dhandre www.gitforgits.com Printed in India

First Printing: October 2024 Cover Design by: Kitten Publishing For permission to use material from this book, please contact GitforGits at support@gitforgits.com.

Content Preface Chapter 1: Advanced Node.js Concepts Overview Intricacies of Node.js Event Loop Phases of Event Loop Timers Phase Pending Callbacks Phase Idle, Prepare Phase Poll Phase Check Phase Close Callbacks Phase Event Loop Benefits and Applications High-throughput Web Servers Real-time Communication Platforms Streaming Data Applications Microservices Architecture IoT Systems API Gateways and Proxies Asynchronous Programming Patterns

Callbacks Promises Async/Await Managing Complex Asynchronous Workflows Parallel Execution with Promises Sequential Execution with Async/Await Handling Multiple Independent Operations Cancellation and Timeouts Deep Dive into Buffers and Binary Data Handling Understanding Buffers Reading and Writing Binary Data Manipulating Binary Streams Network Communication with Buffers Working with Binary Protocols Buffer Encoding and Decoding Effective Error Handling Using ‘Try/Catch’ Blocks Propagating Errors Using Promises with Error Handling Creating Custom Error Classes Implementing Error Handling Middleware Debugging Techniques Using Node.js Debugger

Utilizing Console Logging Employing Advanced Logging Libraries Inspecting Memory Usage Using Profiling Tools Utilizing Timers and Intervals for Optimized Performance Using ‘setTimeout’ Using ‘setInterval’ Using ‘setImmediate’ Summary Knowledge Exercise Chapter 2: Module Systems and Package Management Overview Advanced Techniques with Node.js Modules CommonJS Modules ES6 Modules Organizing Codebase with Modules Implementing Modules in Platform Scalability through Modularity Maintainability with Clear Module Boundaries

ES6 Modules for Tooling Mixing CommonJS and ES6 Modules Index Files for Simplified Imports Creating and Managing NPM Packages Initializing a New NPM Package Create a New Directory Initialize the Package Developing Package Functionality Create the Main Module File Adding Dependencies Monorepos and Workspace Management Understanding Monorepositories Benefits of Monorepos Setting up Monorepo with Yarn Workspaces Initialize the Root Repository Configure Yarn Workspaces Create Package Directories Initialize Individual Packages Define Package Dependencies Install Dependencies Implementing Code Sharing Between Packages Creating the Utils Package Using Utils in Backend Package Running the Backend Application Managing External Dependencies

Handling Versioning within Monorepo Install Lerna Configure Lerna Implementing Shared Configurations Handling CI/CD Pipelines Leveraging Native Modules Understanding Native Modules Popular Native Modules Using ‘Sharp’ Module for Image Processing Installing Sharp Module Processing Images with Sharp Using Image Service in Application Handling Native Module Dependencies Prerequisites for Native Module Compilation Automating Build Environments Using Native Modules Creating Custom Native Modules Using Node-API (N-API) Dependency Injection and Modular Design Patterns Understanding Dependency Injection Implementing Dependency Injection Refactoring Code for Dependency Injection Injecting Dependencies in the Application Implementing Dependency Injection in Controllers Modular Design Patterns

Applying Factory Pattern Implementing Singleton Pattern Applying Strategy Pattern Summary Knowledge Exercise Chapter 3: Process Management and System Interaction Overview Harnessing Child Processes and Clustering Creating and Managing Child Processes Using ‘spawn’ Using ‘exec’ Using ‘fork’ Performing Parallel Tasks with Child Processes Clustering for Improved Scalability Setting up Clustering Applying Clustering to Our Platform Handling Sticky Sessions Inter-Process Communication Methods Understanding Inter-Process Communication

Message Passing with process.send() and process.on('message') Using Built-in IPC Channels Leveraging Sockets for Communication Utilizing External Message Brokers Optimizing with Worker Threads What Are Worker Threads? Worker Threads for CPU-Intensive Tasks Setting up a Worker Thread Performing CPU-Intensive Tasks Without Blocking Managing Multiple Worker Threads Sharing Memory Between Threads Environment Variables and System Resource Management Understanding Environment Variables Managing Environment Variables in Node.js Setting Environment Variables Using Environment Variables Securely Managing .env file Setting ‘NODE_ENV’ System Resource Management Controlling Resource Usage Monitoring Resource Usage Handling Uncaught Exceptions and Rejections Graceful Shutdown Configuring Application Behavior

Application Configuration Management Advanced Logging with Console and Debug Modules Importance of Logging Utilizing ‘Console’ Module Creating a Custom Logger with Console Redirecting Logs to Files Using ‘Debug’ Module Integrating Debug into App Combining Console and Debug Modules Summary Knowledge Exercise Chapter 4: Network Programming and Security Overview Building Robust HTTP(S) Servers and Clients Setting up HTTP Server Handling Requests and Responses Implementing Middleware Error Handling Middleware Authentication Middleware

Upgrading to HTTPS Generate Self-Signed Certificates Create HTTPS Server Test the HTTPS Server Redirect HTTP to HTTPS Implementing Static File Serving Use Express Static Middleware Adding a Template Engine Create a View Render the View Implementing Body Parsing Middleware Implementing TLS/SSL for Secure Communications Obtaining SSL/TLS Certificates Integrating TLS/SSL into the Server Verifying Encrypted Data Transmission Using OpenSSL's ‘s_client’ Using Wireshark to Inspect Traffic Testing Application Functionality Enforcing Secure Communication Force HTTPS Middleware Integrate Middleware Configuring for Production Update SSL Options Security Enhancements Working with UDP and DNS Modules

Introduction to UDP Datagram Sockets Creating UDP Server and Client UDP Server UDP Client Running UDP Server and Client Integrating UDP UDP Notification Server UDP Notification Client Running Notification Server and Client Introduction to DNS Module Basic DNS Lookup Resolving with ‘dns.resolve’ Reverse DNS Lookup Integrating DNS into App Using Promises with DNS Module Using WebSockets Introduction to WebSockets Implementing WebSockets Securing WebSocket Communications Authentication Handling Origin Verification Scaling WebSocket Connections Summary

Knowledge Exercise Chapter 5: File Systems and Data Streams Overview Advanced File System Operations Handling Asynchronous File Operations Implementing File Watching Managing File Permissions Setting Permissions with ‘fs.chmod()’ Changing File Ownership with ‘fs.chown()’ Checking File Permissions Handling Directory Operations Using Streams for Large Files Mastering Streams for Efficient Data Processing Understanding Streams Using Readable Streams Using Writable Streams Using Duplex Streams Using Transform Streams Using Crypto Module with Transform Streams Reading and Decrypting Manuscript Handling Backpressure Piping Multiple Streams

Creating Custom Stream Implementations Understanding Custom Streams Creating a Custom Transform Stream Creating Route to Perform Analysis Creating a Custom Writable Stream Creating a Custom Duplex Stream Custom Readable Stream Managing Large Data Sets with Buffers Understanding Buffers in Node.js Reading Large Files using Buffers Writing Large Files using Buffers Manipulating Binary Data with Buffers Concatenating Buffers Working with Binary Protocols Integrating Crypto Module for Data Security Introduction to Crypto Module Hashing with Crypto Module Encrypting and Decrypting Data with Cipher Algorithms Setting up Encryption and Decryption Functions Encrypting and Upload Manuscripts Decrypting Manuscripts for Retrieval Testing Encryption and Decryption Encrypting Sensitive Data in Files

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