What is fastify-plugin?
The fastify-plugin npm package is designed to facilitate the creation of plugins for the Fastify web framework. It ensures that plugins adhere to specific conventions and are compatible with the Fastify ecosystem. This package helps in encapsulating functionality, adding hooks, decorators, and more, in a way that's easily reusable across different Fastify projects.
What are fastify-plugin's main functionalities?
Plugin Creation
This feature allows developers to create a Fastify plugin. The code sample demonstrates how to use fastify-plugin to decorate the Fastify instance with a new function called 'utility'.
const fp = require('fastify-plugin');
async function myPlugin (fastify, options) {
fastify.decorate('utility', () => 'something useful');
}
module.exports = fp(myPlugin);
Plugin Options
This feature enables passing options to the plugin, including specifying Fastify version compatibility. The code sample shows how to pass data through options and use it within the plugin.
const fp = require('fastify-plugin');
async function myPlugin (fastify, options) {
fastify.decorate('usefulData', options.data);
}
module.exports = fp(myPlugin, { name: 'myPlugin', fastify: '3.x' });
Encapsulation
This feature ensures that the plugin does not encapsulate its context, allowing the decorators, hooks, and changes made by the plugin to be available in the parent scope. The code sample demonstrates registering another plugin within a fastify-plugin, ensuring dependencies are managed.
const fp = require('fastify-plugin');
async function myPlugin (fastify, options) {
fastify.register(require('some-other-plugin'), options);
}
module.exports = fp(myPlugin, { dependencies: ['some-other-plugin'] });
Other packages similar to fastify-plugin
fastify-decorators
Provides decorators for Fastify, aiming to simplify the creation of controllers, services, and plugins. While it offers a different approach by leveraging TypeScript decorators, it shares the goal of enhancing Fastify's extensibility.
middie
A plugin to add middleware support to Fastify. While fastify-plugin is a tool for creating Fastify plugins, middie focuses specifically on enabling the use of Express/Connect-style middleware within Fastify applications.
fastify-autoload
Automatically loads plugins and routes, simplifying the application structure. Unlike fastify-plugin, which is about creating plugins, fastify-autoload helps in organizing and loading them efficiently in a Fastify application.
fastify-plugin
fastify-plugin
is a plugin helper for Fastify.
When you build plugins for Fastify and you want that them to be accessible in the same context where you require them, you have two ways:
- Use the
skip-override
hidden property - Use this module
Usage
fastify-plugin
can do two things for you:
- Add the
skip-override
hidden property - Check the bare-minimum version of Fastify
Example:
const fp = require('fastify-plugin')
module.exports = fp(function (fastify, opts, next) {
next()
})
If you need to set a bare-minimum version of Fastify for your plugin, just add the semver range that you need:
const fp = require('fastify-plugin')
module.exports = fp(function (fastify, opts, next) {
next()
}, '0.x')
You can check here how to define a semver
range.
Acknowledgements
This project is kindly sponsored by:
License
Licensed under MIT.