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Fastify hooks. All Fastify hooks are still applied.


Fastify hooks. Jul 14, 2022 · A hook in Fastify is an event handler function that has been registered against a specific event. All Fastify hooks are still applied. But how exactly are they executed? For that we can look at the hookRunner function in the hooks. Fastify allows you to listen to specific events in the application or request/response lifecycle. Fastify hooks are similar to middleware in other frameworks and allow you to execute code before or after certain events. This post explains Fastify and its advantages and use cases, and it provides practical tutorial steps to get you Oct 20, 2024 · Custom hook points in Fastify provide developers with powerful tools to extend and customize the framework's behavior at specific stages of the request-response lifecycle. Following this, a logger is instantiated and subsequently passes through the steps shown below. " It governs which decorators, registered hooks, and plugins are available to routes. These hooks allow developers to perform actions or modify behavior at crucial moments, enhancing the flexibility and extensibility of Fastify applications. Before or during the User Handler, reply. Contribute to fastify/fastify development by creating an account on GitHub. My Fastify server code was working fine till last week. Request is a core Fastify object containing the following fields: query - The parsed querystring, its format is specified by querystringParser. Additionally, Fastify’s structured lifecycle hooks allow developers to implement security checks consistently across the application. js 2 Advanced Fastify: Hooks, Middleware, and Decorators 3 Migrate Your Express Application to Fastify May 2, 2020 · I studies the doc and trying to wrap my head aroud the new scope building. Application Let's cd into a fresh directory called 'testing-example' and type npm init -y in our terminal. How autoHooks Works TypeScript TypeScript The Fastify framework is written in vanilla JavaScript, and as such type definitions are not as easy to maintain; however, since version 2 and beyond, maintainers and contributors have put in a great effort to improve the types. The other log I’m currently moved to fastify there are also a lot of plugins available. Defining a decoration asynchronously could result in the Fastify instance booting before the May 29, 2025 · Learn how to build a high-performance API using Fastify and Node. raw is used to send a response, onResponse hooks will still be executed. This plugin can be used in a variety of circumstances, for example, if you have to proxy an internal domain Encapsulation Encapsulation A fundamental feature of Fastify is the "encapsulation context. Each hook type serves a distinct purpose and comes with its own API. A plugin can be a function that takes a Fastify instance, options, and a callback function as parameters. All plugins talk to the Fastify instance directly, which itself is a plugin. These hooks offer fine-grained control over the application's behavior, enabling tasks such as logging, authentication, and data transformation. All errors are automatically handled by Fastify. The left branch shows the corresponding error code generated if the parent throws an error. Jun 28, 2024 · This article explains the importance of context logging in Node. . 1 Mar 28, 2023 · Fastify’s plugin system is powerful and flexible, allowing you to define hooks for different parts of the request/response lifecycle. cjs", or just "hooks. I found this solution that u Fastify 中文文档. js and demonstrates how to implement it using the async_hooks module Nov 2, 2020 · Learn how to build a fast and simple CRUD API using Fastify, while also implementing data validation and adding plugins. Schema-based: even if it is not mandatory we recommend using JSON Schema to validate your routes and serialize your outputs. fastify-ws WebSocket integration for Fastify — with support for WebSocket lifecycle hooks instead of a single handler function. x, which is no longer actively maintained. In this article,… Server-Side Development with Fastify — Customize LoggingFastify is a Nov 4, 2020 · Spread the love Related Posts Server-Side Development with Fastify — Route DeclarationsFastify is a small Node framework for developing back end web apps. Plugins can Encapsulation: Explains a core concept upon which all Fastify plugins are built. May 5, 2023 · Getting Started with Fastify for Node. In this article,… Server-Side Development with Fastify — Customize LoggingFastify is a small Node framework for developing back end web apps. Oct 20, 2024 · Application hooks in Fastify provide a powerful mechanism for executing code at specific points during the application's lifecycle. io fastify/fastify fastify / docs / Hooks. Before diving into the new onListen hook, let's briefly overview Fastify's hooks. This plugin can be used in a variety of circumstances, for example, if you have to proxy an internal domain Introduction The documentation for Fastify is split into two categories: Reference documentation Guides The reference documentation utilizes a very formal style in an effort to document Fastify's API and implementation details thoroughly for the developer who needs such. Jul 28, 2022 · I am using Fastify HTTP proxy in a service that act as a proxy that needs to inspect specific requests/response in the interaction between a client and a target server. js", "validation-hooks. This allows for more flexible request start and end logging by attaching custom onRequest and onResponse hooks. js www. json. HTTP2: Details Fastify's HTTP2 support. This system allows you to define hooks in strategic locations that can be applied to routes within the same directory and optionally to routes in subdirectories. One of them is the onReady hook, which is useful for executing tasks right before the server starts accepting new requests. prototype. Apr 26, 2023 · This post is part of Building Node. Feb 19, 2021 · Server-Side Development with Fastify — Route Level Hooks and Decorators Fastify is a small Node framework for developing back end web apps. aborted in wrapThenable, which is not reliable since NodeJS v15. Fastify is very flexible when it comes to testing and is compatible with most testing frameworks (such as Node Test Runner, which is used in the examples below). By understanding the different types of hooks, their execution order, and best practices, you can create more flexible and maintainable Fastify applications. ), allowing developers to finely control different stages of request processing. Let's start! Install Install with npm: fastify-webpack-hot Webpack Hot Module Replacement for Fastify. Mar 7, 2024 · Middleware and hooks support. Nov 26, 2023 · Fastify has a default content type parser which handles the request body stream and parse it. May 3, 2022 · The Fastify Hooks API helps listen to specific events in the Fastify HTTP routing lifecycle. hook allows you to specify to which lifecycle hook should request context initialization be bound. In this article,… Server-Side Development with Fastify — Route DeclarationsFastify is a small Apr 3, 2020 · Example I propose that a hook definition takes a priority index as an optional third argument. Use Fastify's hooks like preHandler for async tasks after validation. Aug 29, 2024 · Fastify 4. onClose event into hooks is called when fastify. Extensível: Fastify é completamente extensível via hooks, plugins e decorators. I tried search This is documentation for Fastify v3. hijack() can be called to: Prevent Fastify from running subsequent hooks and the user handler Prevent Fastify from sending the response automatically If reply. Hooks are functions that get called at specific points in a component's lifecycle. Plugins can provide a wide variety of functionality, such as middleware, route handlers, hooks, decorators, and more. 5k Star 34. js Applications with Fastify Series 1 Getting Started with Fastify for Node. It focuses on being developer-friendly and helps bootstrap your apps with a high-performance, extensible framework to base your own code on. Mar 6, 2023 · My question is, I need the Fastify instance in the Middleware function to then pass onto the merchant model/class which in turn executes a SQL query. The new type system introduces generic constraining and defaulting, plus a new way to define Jun 23, 2025 · Fastify is a lightweight and flexible Node. The proposed logic works a similar way to how z-index works in css. This information can be invaluable for pinpointing performance bottlenecks. Request Request The first parameter of the handler function is Request. request. You have to register a hook before the event is triggered, otherwise, the event is lost. Throwing errors from custom validators will cause unhandled promise rejections that crash the application when combined with async hooks. appsignal. 5. 7. toString. In this article, I share insights, best practices, and practical examples to boost your backend development Plugins Plugins Fastify can be extended with plugins, which can be a set of routes, a server decorator, or other functionality. Contribute to fastify/docs-chinese development by creating an account on GitHub. By setting this option to true, these log messages will be disabled. addHook. 0 Also, all the code I’ve created so far is listed Fast and low overhead web framework, for Node. fastify-xml-body-parser Parse XML payload / request body into JS / JSON object. It remains widely used, but its development slowed down long ago as applications grew in complexity, and its architecture has remained largely unchanged. To customize this behavior, use setErrorHandler. Require @fastify/cors and register it as any other plugin. js development, offering developers the speed, efficiency, and s Delay Accepting Requests Introduction Fastify provides several hooks useful for a variety of situations. Errors In Fastify Lifecycle Hooks And A Custom Error Handler From the Hooks documentation: If you get an error during the execution of your hook, just pass it to done() and Fastify will automatically close the request and send the appropriate error code to the user. In this article,… Server-Side Development with Fastify — Server OptionsFastify is a small Node framework for developing back end web apps. You have to register a hook before the event is triggered otherwise the event is lost. com Jul 26, 2022 · How Fastify executes hooks This is not everything we need though. js # node # fastify Building Node. Recommendations: Recommendations for how to deploy Fastify into production environments. To customize this behavior you should use setErrorHandler. In this article,… Server-Side Development with Fastify — Customize LoggingFastify is a overview # Fastify allows you to use plugins to add functionality to your application and reuse shared logic. Lifecycle Lifecycle This schema shows the internal lifecycle of Fastify. Fastify allows us to listen to these events Hooks Hooks Hooks are registered with the fastify. js vs Fastify performance with 2025 benchmarks. So I'm passing Fastify from the routes file, to validateMerchant and then to the merchant class file. addHook method and allow you to listen to specific events in the application or request/response lifecycle. To achieve this, Fastify provides the reply. Extensible: Fastify is fully extensible via its hooks, plugins, and decorators. fastify. In this article,… Server-Side Development with Fastify — Customize LoggingFastify is a small Fast and low overhead web framework, for Node. 0. js applications. Routes Routes The route methods configure the endpoints of the application. Discover best practices, scalability tips, and real-world applications. 훅은 fastify. Defining a decoration asynchronously could result in the Fastify instance booting before the decoration completes Run a Fastify application with one command! Contribute to fastify/fastify-cli development by creating an account on GitHub. This behavior can be customized with custom serializers. May 31, 2023 · In the first article of this series, we introduced Fastify and compared it to Express, highlighting the benefits of switching to Fastify for high-performance web applications. There isn't, though, a direct mechanism to handle scenarios in which you'd like the server to start accepting specific requests and denying all others, at least up to Jan 3, 2024 · Fastify 中的拦截器（hooks）是指在路由处理函数（handler）执行前或执行后，添加处理函数的中间件。 Fastify 的拦截器机制能够让开发者增加、修改请求和响应的生命周期事件（lifecycle events），从而支持用户的自定义行为和控制。 @fastify/pre-commit is a pre-commit hook installer for git. Getting-Started Getting Started Hello! Thank you for checking out Fastify! This document aims to be a gentle introduction to the framework and its features. js. These hooks allow you to execute custom logic at predefined points, giving you fine-grained control over your application's flow. Apr 10, 2025 · Secure Fastify APIs easily with the Auth0 Fastify SDK. You have to register a hook before the event is triggered, otherwise the event is lost. For example, you can easily provide input and output validation using JSON Schema and perform specific operations before the handler is executed: Oct 2, 2023 · fastify/lib/route. I understand async/sync to a degree when it comes to fetching data from other API's but I'm struggling to understand Aug 6, 2024 · In this adoption guide, we’ll discuss some reasons to choose Fastify, key features, compare Fastify to some popular alternatives, and more. Nov 1, 2020 · Spread the love Related Posts Server-Side Development with Fastify — Server OptionsFastify is a small Node framework for developing back end web apps. Serverless: Details on how to deploy Fastify applications in various Function as a Service (FaaS) environments. Oct 19, 2020 · An introduction to Fastify, showing how to set up a Fastify API, define API routes, add schema validation to requests, load and use plugins, and define hooks. params - The params Convenience plugin for Fastify that loads all plugins found in a directory and automatically configures routes matching the folder structure. It can however be useful for sending data to external services, for fastify Version: Fast and low overhead web framework, for Node. In this article, we’ll look at how to create back end … Suppose I have multiple things that I need to do sequentially in a particular lifecycle hook, which is a more optimal/efficient approach run-time performance-wise? The only way this impacts me other than performance-wise, is with respect to code maintainability and testablity (unit testing of individual hooks). Meaning that they can't talk to each other directly. Hooks in the Fastify framework provide specific entry points in the application lifecycle where developers can inject custom logic. This API is synchronous. js, designed with a focus on speed, security, and a great developer experience. Internally Fastify compiles the schema in a highly performant function. Principais recursos Alto desempenho: até onde sabemos, Fastify é um dos mais rápidos web frameworks 'na área', dependendo da complexidade do código, com o Fastify, você pode servir mais de 76 mil requisições por segundo. js/Fastify since October 2022, coming from a PHP background. call(opts[hook])) Hooks Hooks Hooks are registered with the fastify. Errors: Details how Fastify handles errors and lists the standard set of errors Fastify generates. Fastify's plugin model is fully reentrant and graph-based, it handles asynchronous code without any problems and it enforces both the load and close order of plugins. Alternatives Fastify offers alternatives to commonly used middleware, such as @fastify/helmet for helmet, @fastify/cors for cors, and @fastify/static for serve-static. The req object is the Fastify Request object, and the res object is the Fastify Reply object. Sep 12, 2023 · 3. Complete migration guide included. The right branch of each section shows the next phase of the lifecycle. Express’s flexible middleware model offers similar capabilities but requires careful orchestration by the developer. Narrowing down, the problem was introduced when upgrading from 3. 1 Plugins Plugins are the main way to add functions, share code, or encapsulate logic in a Fastify application. Here’s an example of plugins Middleware engine for Fastify. x- serializing response body in onResponse hookThe docs suggest the onResponse hook is a good place for handling my use case, which includes recording a response scoped to an individual request: The onResponse hook is executed when a response has been sent, so you will not be able to send more data to the client. Proxy your HTTP requests to another server, with hooks. Hooks are registered with the fastify. send() from an async handler, with an asynchronous onSend hook, it is possible that the hook can be called more than once per request. “Server-Side Development with Fastify — App Hooks” is published by John Au-Yeung in DataSeries. md 412 lines (342 loc) • 13. See Fastify Factory requestIdHeader and Fastify Factory genReqId for customization options. Is there a way for the onResponse hook to execute ONLY when the Sep 17, 2024 · As a proud sponsor and active contributor to the Fastify project, we're thrilled to announce the release of Fastify v5. We see this function acts as a sort of recursive loop that continues running as long as the handlers do not error. js file. Nov 3, 2020 · Spread the love Related Posts Server-Side Development with Fastify — Middleware and HooksFastify is a small Node framework for developing back end web apps. js, valued for its simplicity, flexibility, and vast ecosystem. Mar 28, 2025 · Hooks can be used to execute preprocessing or postprocessing logic, such as permission checking, request logging, modifying responses, etc. Understanding Route Autoloading with Hooks The route autoloader has some special features relating to hooks. Fastify has rapidly become an essential framework for modern Node. Using CLI Get the fastify-cli to create a new scaffolding project: npm install --global fastify-cli fastify generate myproject Request/Response validation and hooks Fastify can do much more than this. Encapsulation: Explains a core concept upon which all Fastify plugins are built. addHook 메서드로 등록될 수 있으며 애플리케이션이나 요청/응답 생명 주기의 특정 이벤트를 들을 수 있게 해줍니다. Fastify provides various types of hooks (such as onRequest, preHandler, onSend, etc. The Hook System in @fastify/autoload enables automatic loading and cascading of Fastify hooks throughout your application directory structure. Note that you need to initialize it on the earliest lifecycle stage that you intend to use it in, or earlier. g. Jul 22, 2024 · Fastify is like the superhero of web frameworks, swooping in to save the day with the best developer experience and the least amount of hassle. Here I will show you how to create a plugin with Fastify using the following versions: Fastify v4. Aug 7, 2023 · When using reply. Inspired by Hapi and Express, Fastify is so speedy Mar 13, 2025 · For years, Express has been the go-to framework for Node. Fastify offers a different approach, focusing on efficiency, built-in validation, and structured plugins while keeping a FactorydisableRequestLogging Default: false When logging is enabled, Fastify will issue an info level log message when a request is received and when the response for that request has been sent. Nov 30, 2021 · The onRequest hook will only be scoped to the plugin itself, if you want it register the hook to run on any request that happens on the server then you have to wrap and export it with fastify-plugin 🙂 Monitor Hook Execution Times: Use Fastify’s built-in logging or external monitoring tools to keep track of the execution times of your hooks. The guides category utilizes an informal educational style as a means to introduce newcomers to core and advanced Fastify Jan 14, 2022 · 💬 A change in Fastify hook types broke our hooks When upgrading Fastify we encountered strange problems with our preHandler-hooks. Provide stats for routes using require('node:perf_hooks'), for Fastify. We can use this feature to validate WebSocket connections before the WebSocket handshake occurs. Hooks are registered with the fastify. Feb 24, 2021 · Fastify offers some alternatives to the most commonly used middlewares, such as fastify-helmet in the case of helmet, fastify-cors for cors and fastify-static for serve-static. By using hooks you can interact directly with the lifecycle of Fastify. It adds an onRequest hook and a wildcard options route. The chosen approach makes us write decoupled code. We also explored Fastify's plugin system in detail, showing you how to extend and customize your web applications with reusable modules. We would like to show you a description here but the site won’t allow us. Default value is onRequest. Style Guide: Explains the writing style we use for the Fastify documentation for those who want to contribute documentation. js 2 Advanced Fastify: Hooks, Middleware, and Decorators 3 Migrate Your Express Application to Fastify Nov 24, 2017 · I'm trying to setup auth as per example from fastify-auth: fastify. What I understood is that if in my plugin I register the hooks like that module. Mar 7, 2024 · Request Lifecycle and Hooks Fastify is based on a lifecycle/hook model where hooks are per-route (or per-encapsulation context), guaranteeing that only what is needed is executed. 0: nodejs/node#41117 The comments in the code . verifyJWT])) fastify. See full list on blog. exports = function (fastify, opts, done) { Testing Testing is one of the most important parts of developing an application. Now we know the order in which the hooks are stored. It is an elementary preface with examples and links to other parts of the documentation. “Server-Side Development with Fastify — Hooks” is published by John Au-Yeung in Dev Genius. The type system was changed in Fastify version 3. close() is executed. Use the register API to add one or more plugins. Each plugin is independent. Run npm i fastify && npm i pino-pretty -D Hooks Hooks Hooks are registered with the fastify. When we create a Fastify server instance, there’s a Nov 3, 2020 · Spread the love Related Posts Server-Side Development with Fastify — Middleware and HooksFastify is a small Node framework for developing back end web apps. send() is called), and allows you to prevent Fastify from sending the response, and from running the remaining hooks (and user handler if the reply was hijacked before). How? Glad you asked, check out Hooks Hooks Hooks are registered with the fastify. I suggest using something like this: Feb 18, 2021 · Fastify is a small Node framework for developing back end web apps. Oct 30, 2017 · fastify / fastify Public Notifications You must be signed in to change notification settings Fork 2. Fastify still uses reply. But don't worry, you can still force a commit by telling git to skip the pre-commit hooks by simply committing using --no-verify. A visual representation of the encapsulation context is shown in the following figure: In the figure above, there are several entities: The root context Three root plugins Two child contexts, each with: Two child Feb 25, 2021 · Fastify is a small Node framework for developing back end web apps. This fastify plugin forwards all requests received with a given prefix (or none) to an upstream. Configurable: Fastify offers a plugin system just like Express. Dec 1, 2023 · Token based authentication with Fastify, JWT, and Typescript Building web applications? You’ll probably need user authentication. hijack() method that can be called during the request lifecycle (At any point before reply. js Applications with Fastify (3 Part Series) 1 Getting Started with Fastify for Node. It can attach any type of property to core objects, e. Feb 1, 2023 · Prerequisites I have written a descriptive issue title I have searched existing issues to ensure the feature has not already been requested 🚀 Feature Proposal We have an onReady hook used if we wan This code uses Fastify to create the server and a preHandler hook to define the middleware. When a request is received, routing occurs immediately. Aug 25, 2024 · In this comprehensive guide, we will cover everything you need to know to get up and running with Fastify from scratch: Installing Fastify Creating your first server Fastify‘s Architecture Defining routes Using plugins Handling requests and sending responses Validation and serialization Logging Testing Security Best Practices Performance optimization Deployment options Debugging and Nov 4, 2020 · Spread the love Related Posts Server-Side Development with Fastify — Middleware and HooksFastify is a small Node framework for developing back end web apps. This feature enables plugin encapsulation and Sep 15, 2023 · Request/Reply hooks: There are a total of 10 hooks that are called in a specific order during the HTTP request lifecycle. , functions, plain objects, or native types. As developers, It’s our responsibility to safeguard user data Fastify plugin to override decorators, plugins and hooks - matthyk/fastify-override Apr 7, 2021 · I'm trying to increment a value when the request is successful. 2 kB Markdown Technical Principles Every decision in the Fastify framework and its official plugins is guided by the following technical principles: “Zero” overhead in production “Good” developer experience Works great for small & big projects alike Easy to migrate to microservices (or even serverless) and back Security & data validation If something could be a plugin, it likely should be Easily Hooks Hooks Hooks are registered with the fastify. There are also a few events that are triggered at the application level. This enables developers to extend and customize Fastify’s behavior. route({ method: 'POST', url Jun 3, 2021 · 💬 Why is the onRequest hook not triggering when the application doesn´t find a registered matching route? When running the npm init fastify command and registering a plugin that adds a onRequest ho May 24, 2025 · Compare Express. auth([fastify. Where fastify is the encapsulated Fastify instance, options is the options object, and done is the function you must call when your plugin is ready. It simplifies Auth0 integration, offering route protection and token validation. raw. 29. They’re explained in-depth in the Fastify Hooks documentation. It will ensure that your npm test (or other specified scripts) passes before you can commit your changes. Most of the events triggered by Fastify relate to the different stages of the request/response lifecycle. Built upon ws and uws. Full declaration Routes options Shorthand declaration Url building Async Await Promise resolution Route Prefixing Handling of / route inside prefixed plugins Custom Log Level Custom Log Serializer Config Constraints Version Constraints Host Mar 28, 2025 · 5. defaultStoreValues / defaultStoreValues(req: FastifyRequest) sets initial values The decorators API customizes core Fastify objects, such as the server instance and any request and reply objects used during the HTTP request lifecycle. In this article,… Server-Side Development with Fastify — Customize LoggingFastify is a Mar 18, 2025 · This will match files like "auth-hooks. Oct 20, 2024 · Fastify hooks provide a powerful mechanism for extending and customizing your application's behavior. May 19, 2023 · I've been used Node. Fastify handles 48,000 requests/second vs Express. Nov 26, 2020 · All you need to know to control the Fastify errors! Error types Errors in the Fastify wor Tagged with fastify, node, errors, webdev. js web framework used to build dynamically generated web pages and high-performance API back ends. By default, register creates a new scope, meaning changes to the Fastify instance (via decorate) will not affect the current context ancestors, only its descendants. Oct 20, 2024 · In Fastify, hooks provide a powerful mechanism to extend and customize the request-response lifecycle. Contribute to fastify/middie development by creating an account on GitHub. There is no built in middleware support, so you have to create a plug-in and use the hooks. Feb 26, 2025 · Fastify is a high-performance web framework for Node. js Line 273 in 7d97dcd throw new FST_ERR_HOOK_INVALID_HANDLER(hook, Object. Plugins can modify Fastify or act in certain moments (when the server closes or the request is sent for example). js". I believe the logic could live here. Fastify hooks and middleware are mechanisms provided by the Fastify framework that allow you to intercept and modify the request/response lifecycle. They allow you to inject custom functionality at these crucial moments, thus altering the component's behavior. Since your onRequest hook consumes the request body stream, the parser fails and gets stuck. Middleware is executed before the request reaches the handler, indicating that the middleware’s work is done. And if This plugin accepts options hook and defaultStoreValues, createAsyncResource. When we have multiple hooks registered for the same hook event, then we will sort the hooks using the priority index when we build hooks. 2k Fastify CASL plugin that supports ACL-like protection of endpoints via either a preSerialization & preHandler hook, sanitizing the inputs and outputs of your application based on user rights. When using custom validators with async preValidation hooks, validators must return {error} objects instead of throwing errors. 0 nodejs v19. Plugins, Decorators, Middleware, Hooks In Fastify, plugins, decorators, middleware, and hooks are core concepts of the framework, each playing a different role: 5. Request and response hooks allow developers to intercept and modify requests and responses at various stages of processing. May 8, 2024 · Fastify's hooks are a fundamental aspect of its design. Aug 29, 2022 · Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, Jan 17, 2024 · Fastify Concepts Lifecycle and Hooks Fastify operates on two main lifecycles: one for the application itself and another for the request and reply. addHook('preHandler', fastify. Now all of a sudden (I am sure some dependency somewhere got updated) I am getting errors on line where I am calling . body - The request payload, see Content-Type Parser for details on what request payloads Fastify natively parses and how to support other content types. @fastify/http-proxy is built on top of @fastify/reply-from, which enables single route proxying. Request/Response Hooks By using the hooks you can interact directly inside the lifecycle of Fastify. This is all conveniently configured in your package. Hooks Hooks Hooks are registered with the fastify. Yet the onResponse executes whatever the response from the handler is. Fastify Plugin Example Fastify’s plugins encapsulate functionality and provide lifecycle hooks, making them reusable and efficient. Serializers The default logger uses standard serializers for objects with req, res, and err properties. Sep 8, 2024 · Discover how to leverage Fastify for building efficient, scalable Node. Hooks: Details the API by which Fastify plugins can inject themselves into Fastify's handling of the request lifecycle. In this part, we'll dive deeper into some of Fastify's more advanced concepts 此时，Fastify 的实例将会作为回调函数参数的一个属性，该实例可以添加钩子、插件、路由及其他任意内容。 举例来说，某个监控工具可以如下使用（当然这是一个简化的例子）。 Alternatives Fastify offers some alternatives to the most commonly used middleware, such as @fastify/helmet in case of helmet, @fastify/cors for cors, and @fastify/static for serve-static. Routes can be declared using the shorthand method or the full declaration. Decorators Decorators The decorators API customizes core Fastify objects, such as the server instance and any request and reply objects used during the HTTP request lifecycle. cglchz rturn wdqz chqmbi hsq azzjqm viixww vofltthp umvbp cpoik

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