In-app vite:serverCreated event hooks

title: vite:serverCreated event hooks in applications
date: 2024/11/18
updated: 2024/11/18
author: cmdragon

excerpt:
Using the vite:serverCreated hook, developers can perform specific actions when a Vite server is created, including adding middleware and custom configurations. This enables rapid response to requests and adjustments to server behavior in development environments, improving development efficiency and user experience.

categories:

front-end development

tags:

Nuxt
Vite
hooks
middleware
log (computing)
cross-domain
exploit (a resource)

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In Nuxt 3.vite:serverCreated Hooks allow developers to execute custom logic after the Vite server has been created. The use of this hook allows developers to dynamically adjust the behavior of the server, thus enhancing the development experience and system flexibility.

article outline

Definitions and roles
timing of call
Parameter description
Sample usage
application scenario
- 5.1 Adding Server Middleware
- 5.2 Custom Logging Functions
- 5.3 Special treatment in the development environment
- 5.4 Handling cross-domain requests
caveat
- 6.1 Performance considerations
- 6.2 Order of execution of middleware
- 6.3 Adaptive processing
summarize

1. Definitions and roles

vite:serverCreated is a hook in Vite that allows developers to perform certain actions immediately after the Vite server is created.
With this hook, you can access to the server instance and perform custom configurations, add middleware, and more.

2. Timing of the call

vite:serverCreated The hook is invoked after the Vite server instance is created and before it starts listening for requests. This timing is ideal for initialization or configuration operations on the server.

3. Description of parameters

The hook receives two parameters:

viteServer: The currently created instance of the Vite server contains a number of methods and properties for manipulating the server.
env: The current environment variables, allowing different actions to be taken depending on the environment.

4. Example usage

Here's how to usevite:serverCreated A basic example of a hook that shows how to add custom logic to a Vite server when it is created.

exist`plugins/` Implementation in the document

// plugins/

export default defineNuxtPlugin((nuxtApp) => {
  ('vite:serverCreated', (viteServer, env) => {
    // Output the current environment
    ('Current environment:', env.NODE_ENV); {

    // Add custom middleware on server creation
    ((req, res, next) => {
      ('Request path:', ); // Add custom middleware at server creation time.
      next(); // Continue processing the request
    });
  });
});

5. Application scenarios

5.1 Adding Server Middleware

pass (a bill or inspection etc)vite:serverCreated hooks, you can easily add custom middleware to the Vite server to handle specific requests or responses.

((req, res, next) => {
  if ( === '/api/special') {
    (200, { 'Content-Type': 'text/plain' }); {
    ('This is a special API response');;
  } else {
    next(); // Continue to replace with the next middleware or processor.
  }
}).

5.2 Custom Logging Functions

Capturing and printing request logs is a common requirement during development. Using thevite:serverCreated hooks, you can easily implement a request logging feature to record the time, method and path of a request.

((req, res, next) => {
  const timestamp = new Date().toISOString();
  (`[${timestamp}] request method: ${} | request path: ${}`); { const timestamp = new Date(.toISOString(); // Continue processing the request.
  next(); // Continue processing the request
}).

5.3 Special treatment in the development environment

You can add some specific processing logic to your development environment based on different environment variables. For example, you may want to enable debugging information in development mode:

if (env.NODE_ENV === 'development') {
  ((req, res, next) => {
    ('Request in development mode:', ); }
    next(); // Continue processing the request
  });
}

5.4 Handling cross-domain requests

During the development phase, the front-end and back-end usually run on different ports, which can lead to problems with cross-domain requests. You can solve this problem by adding CORS middleware:

((req, res, next) => {
  ('Access-Control-Allow-Origin', '*'); // Allow access for all domains
  ('Access-Control-Allow-Methods', 'GET, POST, OPTIONS'); // allowed request methods
  ('Access-Control-Allow-Headers', 'Content-Type'); // Allowed request headers
  if ( === 'OPTIONS') {
    // Handle preflight requests
    (204); // No content
    return ();
  }
  next();
}).

6. Cautions

6.1 Performance considerations

When adding middleware, consider the impact on performance. Try to avoid blocking operations in request processing, such as complex computations or I/O operations. These can cause requests to be delayed or lag.

6.2 Order of execution of middleware

The order in which middleware is executed affects how requests are processed. Ensure that the order of operation is clear when designing the middleware to avoid logical conflicts, if a middleware does not call thenext(), subsequent middleware will not be able to execute.

6.3 Adaptive processing

When writing middleware, adaptation to different environment variables is necessary. For example, the development environment can enable more debugging information, while the production environment should be kept simple. This is accomplished byenv parameter, you can easily implement this function.

7. Summary

By using thevite:serverCreated Hooks that allow developers to perform specific actions when a Vite server is created, including adding middleware and custom configurations. This enables rapid response to requests and adjustments to server behavior in development environments, improving development efficiency and user experience.

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