Book excerpt: Node.js Recipes are structured in a Cookbook format featuring recipes that contain problem statements and solutions. A detailed explanation follows each problem statement of the recipe. This is usually contained within the solution; however, an optional discussion section can often contain other useful information helping to demonstrate how the solution works.Node.js® is built on Chrome's V8 JavaScript Engine. Node.js is designed to build and execute applications using an event-driven, non-blocking Input/Output model attempting to make it lightweight and efficient. Node.js contains one of the largest open source package ecosystem using npm to create, install, and manage a variety of useful JavaScript packages that can easily be embedded into any Node application.