Summary  
This chapter explains how to structure server code using a framework by defining routes for various HTTP methods and parameters and by organizing request processing through customizable middleware layers.

General domain of usage  
Web applications

# We've covered the essentials of Express.js

#### Why use Express.js? 
We learned its role, benefits over plain Node.js, and various use cases.

#### Setting up an Express application
We installed Express.js, created a simple app, and explored its basic structure.

#### Creating routes and handling requests
We mastered route creation, handling different HTTP methods, and managing URL parameters.

#### Middleware in Express
We understood middleware, created custom ones, used built-in middleware, and discussed execution order.

Learn to build backend applications with Node.js and Express.js. Set up your environment and create your first Node.js apps. Work with the file system and build simple console tools. Use Express.js to build web apps, handle routes, and manage requests.

Explore the Backend's crucial role and get acquainted with Node.js — a game-changing runtime environment. Uncover its advantages, learn Node.js installation, and dive into creating your first Node.js app.

Create console applications using Node.js. We will cover fundamental concepts, practical examples, and hands-on exercises to ensure we can confidently create our console applications.

Delve into Express.js as a web application framework. You'll gain insights into why Express is a popular choice for web development, how to set up a basic Express application, create routes to handle various requests and understand middleware concepts.

Learn how to build a REST API using Node.js and Express.js, step by step. This section will walk you through creating a simplified Twitter-like app, helping you master the art of developing RESTful APIs while adding a valuable project to your portfolio.

Summary of Key Express.js Concepts

We've covered the essentials of Express.js

Why use Express.js?

Setting up an Express application

Creating routes and handling requests