Book Image

Accelerating Server-Side Development with Fastify

By : Manuel Spigolon, Maksim Sinik, Matteo Collina
5 (1)
Book Image

Accelerating Server-Side Development with Fastify

5 (1)
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 encapsulation

So far, we’ve written a few plugins. We are pretty confident about how they are structured and what arguments a plugin receives. We still need to discuss one missing thing about them – the concept of encapsulation.

Let’s recall the plugin function definition signature:

async function myPlugin(fastify, options)

As we know at this point, the first parameter is a Fastify instance. This instance is a newly created one that inherits from the outside scope. Let’s suppose something has been added to the root instance, for example, using a decorator. In that case, it will be attached to the plugin’s Fastify instance, and it will be usable as if it is defined inside the current plugin.

The opposite isn’t true, though. If we add functionalities inside a plugin, those things will be visible only in the current plugin’s context.

Context versus scope

Firstly, let’s take a look at the definitions...