Welcome to Web development with Node.js, Fifth Edition The most popular server-side web development platform is Node.js, which enables programmers to utilize the same tools and paradigms for both server-side and client-side applications. This revised fifth edition of Node.js Web Development walks you through current ideas, methods, and best practices for utilizing Node.js while concentrating on the new capabilities of Node.js 14, Express 4.x, and ECMAScript. He book begins by guiding you through the fundamental ideas of creating server-side web applications with Node.js. You'll discover how to create a full-featured Node.js web application with a backend database tier to enable you to experiment with various databases. Terraform and Docker Swarm will be used to deploy the program to actual web servers, such as a cloud hosting infrastructure based on AWS EC2, while integrating additional technologies. As you advance, you'll learn about functional and unit testing as well as using Docker to install test infrastructure. Finally, you'll learn how to implement a variety of app security measures using best practices, tighten the security of Node.js apps, provision HTTPS using Let's Encrypt, and more. The book will assist you in applying your knowledge across the complete life cycle of designing a web app with each chapter. You will have obtained useful Node.js web development expertise by the end of this book, and you will be able to create and deploy your own applications using a public web hosting service. What Node.js is Every frontend web developer has access to JavaScript, making it a tremendously popular programming language that has gained the stigma of being used just for client-side code in web pages. Given that you choose to read this book, there's a good chance you've heard of Node.js, a framework for writing JavaScript code outside of web browsers. Node.js, which has been around for ten years, is now a well-established programming environment that is utilized in numerous initiatives of various sizes. You will learn about Node.js in this book. You will have gained knowledge of every stage of creating server-side web applications using Node.js by the time you finish this book, from conception to deployment and security. In writing this book, we made the following assumptions: • You are already proficient in writing software. • You are knowledgeable about JavaScript. • You have some experience creating web applications in several languages. Do we stick with a new programming tool only because it's the trendy new tool when we assess it? Maybe some of us do that, but the mature course of action is to compare each tool. The technical justification for choosing Node.js is what this chapter is all about. Prior to writing any code, it is important to understand what Node.js is and how it fits into the larger market for software development tools. Then, realizing that tinkering about in live code is frequently the greatest way to learn, we will get right into creating usable applications. In this chapter, we'll go over the following subjects: • An overview of Node.js • What Node.js is capable of • Why Node.js should be used • Node.js's architecture • Utilizing Node.js for performance, utilization, and scalability • Microservice architecture, Node.js, and testing • Using Node.js, implement the 12-factor app model Description of Node.js Node.js is a cutting-edge framework for creating general-purpose programming, network servers, clients of any kind, application servers, and web applications. It uses a clever combination of server-side JavaScript, asynchronous I/O, and asynchronous programming to achieve tremendous scalability in networked applications. Despite being only ten years old, Node.js has quickly gained popularity and is currently having a big impact. It is being used by both large and small businesses for both large- and small-scale initiatives. For instance, PayPal has migrated numerous services from Java to Node.js. The architecture of Node.js deviates from a standard decision made by other application platforms. In contrast to Node.js, where threads are frequently utilized to scale an application to fill the CPU due to their intrinsic complexity. Single-thread event-driven architectures are said to provide reduced memory footprints, high throughput, superior latency profiles under load, and easier programming models. Numerous people view the Node.js platform, which is currently experiencing tremendous growth, as a strong alternative to the conventional online application frameworks employing Java, PHP, Python, or Ruby on Rails. Its core is a standalone JavaScript engine with extensions that may be used for general-purpose programming and is firmly centered on the creation of application servers. Node.js is not an application server, despite the fact that we are comparing it to platforms for application servers. Node.js is a runtime for programming similar to Python, Go, or Java SE. Even while Node.js is used to build application servers and online application frameworks, it is merely a platform for running JavaScript code. The main architectural decision is to use Node.js' event-driven architecture instead of multithreading. Blocking actions are routed to a single-threaded event loop in the Node.js architecture, and the results are returned to the caller as an event that calls an event handler function. Domain Name System (DNS), HTTP, internet relay chat (IRC), and FTP are just a few examples of the many TCP and UDP protocols that can be implemented using the Node.js core modules. The Socket.IO library for Node.js makes it simple to add real-time chat or monitor existing websites, for example, without the need for technology like an Apache/PHP or Rails stack. Although it supports the development of internet servers or clients, its main use case is regular website development. Due of its small size and fast performance, Node.js is frequently utilized as a glue service. Deploying small services on current cloud infrastructure with function-as-a-service platforms like Kubernetes and Docker is a particularly exciting combo. Node.js's capabilities Outside of web browsers, JavaScript applications can be created using the Node.js framework. This is not the JavaScript environment found in web browsers, which is strange! Node.js uses the same JavaScript programming language as browsers do, however it lacks certain of the browser's functionality. For instance, Node.js does not provide an HTML DOM. In addition to JavaScript support natively, the built-in modules offer the following features: • tools for the command line written in shell script • a read-eval-print loop (REPL), a type of interactive-terminal application • Outstanding process control features to monitor child processes • A buffer object with extensive, event-driven callbacks that handles binary data TCP or UDP sockets • DNS check • a client server for HTTP, HTTPS, and HTTP/2 We tend to be more productive working with higher-level interfaces rather than working at a low level of the HTTP or other protocols. For instance, PHP coders assume that Apache/Nginx/and other servers are already there providing the HTTP, so they don't need to implement the HTTP server portion of the stack. The Node.js community offers a number of web application frameworks, such Express, that provide the higher-level interfaces needed by normal programmers, which simplifies the situation. Developers may concentrate on their business logic by using an HTTP server that is already configured with features like sessions, cookies, providing static files, and logging. Other frameworks enable OAuth 2 or concentrate on REST APIs, for example. What applications does Node.js have? The Node.js community has expanded the technology's uses beyond the creation of web service applications. Build tools: Node.js has gained popularity as a platform for creating command-line tools for communicating with service infrastructure or developing software. Frontend developers frequently utilize Grunt, Gulp, and Webpack to create website assets. Babel is frequently used to transpile current ES-2016 code so that it will work on legacy browsers. Static website production systems, such as Metalsmith, Punch, and AkashaCMS, run at the command line and produce website content that you send to a web server. Popular CSS optimizers and processors, such as PostCSS, are implemented in Node.js. Desktop apps Frameworks for creating desktop applications for Windows, macOS, and Linux include Electron and node-webkit (NW.js). These frameworks enable the creation of desktop apps using web UI technologies by utilizing a sizable portion of Chrome, wrapped by Node.js modules. Applications can make use of cutting-edge web frameworks like Bootstrap, React, VueJS, and AngularJS and are built in contemporary HTML5, CSS3, and JavaScript. The Slack desktop client, the Atom and Microsoft Visual Code programming editors, the Postman REST client, the GitKraken GIT client, and Etcher, which makes it incredibly simple to burn OS images to flash drives to run on single-board computers, are just a few of the well-known applications that have been developed using Electron. Applications for smartphones and tablets can be created using Node.js on both iOS and Android devices thanks to the project Node.js for Mobile Systems. Because a JavaScript engine with JIT capabilities is prohibited by Apple's App Store policies, iOS applications cannot make use of regular Node.js. The project uses Node.js-on-Chakra Core to construct iOS applications while avoiding App Store restrictions. Internet of Things (IoT) The majority of ARM-based single-board computers support the Node.js programming language, which is particularly popular for Internet-of-Things projects. The Node RED project provides the best illustration. It provides a graphical programming environment that enables you to create programs by connecting different types of blocks. It has input and output mechanisms that are hardware-focused, such as those to communicate with the General Purpose I/O (GPIO) pins on Raspberry Pi or Beagle bone single-board computers. Summary This chapter taught you a lot of things. In particular, you learned that JavaScript has applications outside of web browsers and that Node.js is a fantastic programming environment with lots of intriguing features. Despite being a relatively new project, Node.js has quickly gained popularity and is now extensively used for a variety of purposes, including command-line developer tools in addition to online applications. The Node.js platform has been able to keep up with the rapid advancements in the JavaScript language since it is built on Chrome's V8 JavaScript engine. Instead of using threads and blocking I/O, the Node.js architecture uses asynchronous functions controlled by an event loop that initiates callback functions. This architecture claims performance advantages that appear to provide a variety of advantages, Contact Us SEO Expate Bangladesh LTD is the trusted and guaranteed services provider in the world. 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