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

Building a web server using the HTTP module

The main focus of this book, together with presenting Deno and how it can be used, is to learn how to use it to build web applications. Here, we'll create a simple JSON API to introduce you to the HTTP module.

We'll build an API that will save and list notes. We will call these notes post-its. Imagine that this is the API that will feed your post-its board.

We'll create a very simple routing system with the help of Web APIs and the functions from the Deno standard library's HTTP module. Keep in mind we're doing this to explore the APIs themselves and thus this is not production-ready code.

Let's start by creating a folder named post-it-api and a file named index.ts inside. One more time, we will use TypeScript as we believe the autocomplete and type checking capabilities greatly improve our experience and reduce the number of possible errors.

The final code for this section is available at https...