Book Image

Accelerating Server-Side Development with Fastify

By : Manuel Spigolon, Maksim Sinik, Matteo Collina
Book Image

Accelerating Server-Side Development with Fastify

By: Manuel Spigolon, Maksim Sinik, Matteo Collina

Overview of this book

This book is a complete guide to server-side app development in Fastify, written by the core contributors of this highly performant plugin-based web framework. Throughout the book, you’ll discover how it fosters code reuse, thereby improving your time to market. Starting with an introduction to Fastify’s fundamental concepts, this guide will lead you through the development of a real-world project while providing in-depth explanations of advanced topics to prepare you to build highly maintainable and scalable backend applications. The book offers comprehensive guidance on how to design, develop, and deploy RESTful applications, including detailed instructions for building reusable components that can be leveraged across multiple projects. The book presents guidelines for creating efficient, reliable, and easy-to-maintain real-world applications. It also offers practical advice on best practices, design patterns, and how to avoid common pitfalls encountered by developers while building backend applications. By following these guidelines and recommendations, you’ll be able to confidently design, implement, deploy, and maintain an application written in Fastify, and develop plugins and APIs to contribute to the Fastify and open source communities.
Table of Contents (21 chapters)
Part 1:Fastify Basics
Part 2:Build a Real-World Project
Part 3:Advanced Topics

Understanding the application lifecycle

The application lifecycle covers the boot process and the execution of our application server. In particular, we refer to loading the plugins, adding routes, making the HTTP server run, and eventually closing it. Fastify will emit four different events, allowing us to interact with the behavior of every phase:

  • onRoute
  • onRegister
  • onReady
  • onClose

Now, for every event of the previous list, let’s check the respective callback signature and most common use cases.

The onRoute hook

The onRoute hook event is triggered every time a route is added to the Fastify instance. This callback is a synchronous function that takes one argument, commonly called routeOptions. This argument is a mutable object reference to the route declaration object itself, and we can use it to modify route properties.

This hook is encapsulated and doesn’t return any value. Therefore, one of the most common use cases is adding route...