title: Detailed Guide to Creating Error Objects with createError
date: 2024/8/8
updated: 2024/8/8
author: cmdragon
excerpt:
Abstract: This article introduces the use of createError function in Nuxt application development for creating error objects with additional metadata to enhance the flexibility of error handling and user experience. The content includes function parameter description, application examples in Vue components and API routing, creation of custom error pages, error capture and handling techniques, and how to trigger a fatal error to display a full-screen error alert.
categories:
- front-end development
tags:
- error handling
- Nuxt Applications
- Vue components
- API Routing
- Custom Errors
- metadata
- user experience
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When developing nuxt applications, handling errors is an important part of ensuring that the user experience is not compromised. We can use thecreateError function to create an error object with additional metadata.
What is it?createError？
createError is a function for creating error objects that support additional metadata such as status codes, status messages, etc. These error objects can be used in Vue and Nitro parts of the application and can be thrown to provide more context when handling errors.
function parameter
createError The function receives an object as a parameter, which can contain the following properties:
-
cause:: Root causes of errors (optional) -
data: Additional data (optional) -
message: Error message (optional) -
name: Error name (optional) -
stack: Error stack (optional) -
statusCode: HTTP status code (optional) -
statusMessage: Status messages (optional) -
fatal: Signs of lethality (optional)
In the following examples, we will clarify how error handling is performed on both the client and server side.
Example 1: Using thecreateError
In a Vue component, we can use thecreateError Throwing errors to be handled in the user interface. Here is an example where we try to get the details of a movie and throw an error with a 404 status code if no relevant data is found.
<template>
<div>
<h1> movie details</h1>
<p v-if="!data"> Loading... </p>
<p v-else>{{ }}</p>
</div>
</template>
<script setup lang="ts">;
const route = useRoute()
// Use useFetch to get the movie data
const { data } = await useFetch(`/api/movies/${}`)
// If no data is found, throw an error
if (!) {
throw createError({ statusCode: 404, statusMessage: 'Page not found' })
}
</script>
In this example, if the movie data is not found, the user is presented with a full-screen error page.
Example 2: Use in API RoutingcreateError
In addition to using it in Vue components, we can also use it in API routingcreateError to throw an error. The following is an example that demonstrates how to handle non-existent resources in API routing.
export default eventHandler(() => {
// Assuming the requested movie is not found here
throw createError({
statusCode: 404,
statusMessage: 'Page not found'
})
})
In this example, when a user requests a movie that does not exist, the server returns a 404 error indicating that the page was not found.
process error
Customizing the error page
You can do this by adding the~/ File to customize the default error page. This file should contain the logic for handling errors and a template for displaying error messages.
Below is a simple example of a customized error page:
<script setup lang="ts">
const props = defineProps({
error: Object
})
const handleError = () => clearError({ redirect: '/' })
</script>
<template>
<div>
<h2>{{ }}</h2>
<button @click="handleError">Clearing Errors</button>
</div>
</template>
error object (computing)
error The object contains the following fields:
-
url: The URL where the error occurred -
statusCode: HTTP status codes -
statusMessage: Status messages -
message: Error Details -
description: Error Description -
data:: Additional error data
If you throw a custom error, make sure to use thedata field to store custom content.
Catching and handling errors
Recommended useonErrorCaptured maybevue:error hook to handle errors. You can configure this hook to catch and handle errors in the Nuxt plugin:
// plugins/
export default defineNuxtPlugin(nuxtApp => {
('vue:error', (err) => {
// Handling errors
})
})
Clearing Errors
When you are ready to remove the error page, you can use theclearError function to clear previously thrown errors. You can use it to restore the normal state when needed, such as when the user revisits the page.
trigger a fatal error
If you want to trigger a full-screen error page on the client side, you can do so by setting thefatal: true to realize. Example:
throw createError({ statusCode: 500, message: 'Internal server error', fatal: true })
In this way, the user will see a more obvious error message.
summarize
utilizationcreateError Functions allow for more flexible error management and improved user experience. By adding appropriate error messages and metadata, developers can help users better understand what errors are occurring and take the necessary steps when needed.
For the rest of the article, please click to jump to the personal blog page or scan the code to follow or WeChat search:Programming Intelligence Front-End to Full-Stack Communication and Growth, read the full article:Detailed Guide to Creating Error Objects with createError | cmdragon's Blog
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