Book Image

Deno Web Development

By : Alexandre Portela dos Santos
Book Image

Deno Web Development

By: Alexandre Portela dos Santos

Overview of this book

Deno is a JavaScript and TypeScript runtime with secure defaults and a great developer experience. With Deno Web Development, you'll learn all about Deno's primitives, its principles, and how you can use them to build real-world applications. The book is divided into three main sections: an introduction to Deno, building an API from scratch, and testing and deploying a Deno application. The book starts by getting you up to speed with Deno's runtime and the reason why it was developed. You'll explore some of the concepts introduced by Node, why many of them transitioned into Deno, and why new features were introduced. After understanding Deno and why it was created, you will start to experiment with Deno, exploring the toolchain and writing simple scripts and CLI applications. As you progress to the second section, you will create a simple web application and then add more features to it. This application will evolve from a simple 'hello world' API to a web application connected to the database, with users, authentication, and a JavaScript client. In the third section, the book will take you through topics such as dependency management, configuration and testing, finishing with an application deployed in a cloud environment. By the end of this web development book, you will become comfortable with using Deno to create, maintain, and deploy secure and reliable web applications.
Table of Contents (15 chapters)
Section 1: Getting Familiar with Deno
Section 2: Building an Application
Section 3: Testing and Deploying

Preparing the environment for the application

The environment where an application runs always has a big impact on it. It is one of the big causes of the so-common statement, "it works on my machine". Over the years, developers have been creating solutions that try to minimize this as much as possible. These solutions can go from automatically provisioning new clean instances for the application to run, to creating more complete packages where everything the application depends on is included.

We can refer to virtual machines (VMs) or containers as ways to achieve this goal. Both are different solutions to the same problem but have one big thing in common: resource isolation. Both try to isolate an application from the environment around it. There are many reasons for this, from security, to automation, to reliability.

Containers are a modern way of providing a package for an application. Modern software projects use them to provide a single container image that has...