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)
1
Section 1: Getting Familiar with Deno
5
Section 2: Building an Application
10
Section 3: Testing and Deploying

Summary

As we go through the book, our knowledge of Deno gets more practical and we start to use it for use cases that are closer to the real world. That was what this chapter was about.

We started the chapter by learning about some fundamental characteristics of the runtime, namely the program lifecycle, and how Deno sees module stability and versioning. We rapidly moved on to the Web APIs provided by Deno by writing a simple program that fetches the Deno logo from the website, converts it to base64, and puts it into an HTML page.

Then, we got into the Deno namespace and explored some of its low-level functionality. We built a couple of examples with the filesystem API and ended up building a rudimentary copy of the ls command with it.

Buffers are things that are heavily used in the Node world, with their capabilities to perform asynchronous read and write behavior. As we know, Deno shares many use cases with Node.js, and that made it impossible to not talk about buffers...