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

Running Deno code in the browser

One of the things we mentioned in the previous chapters and one that we've considered as one of Deno's selling points is its full compatibility with ECMAScript6. This makes it possible for Deno code to be compiled and run on the browser. This compilation is something made by Deno itself, and the bundler is included in the toolchain.

This feature enables a whole load of possibilities. A lot of them are due to the capacity for sharing code between the API and the client, and that's what we'll explore in this section.

We'll build a very simple JavaScript client to interact with the Museums API we just built. This client can then be used by any browser application that wants to connect to the API. We'll write that client in Deno and bundle it so that it can be used by a client, or even served by the application itself.

The client we'll write will be a very rudimentary HTTP client, thus we'll not focus much...