How to create a custom 404 error page in a Vue.js single-page application

To create a custom 404 error page in a Vue.js single-page application, you can follow these steps:

1. Create a Component for the 404 Page: First, create a Vue component for the 404 page. This component will represent the content of the custom error page.

2. Configure Routing: Configure your Vue Router to handle 404 errors by redirecting to the custom 404 page whenever a route is not found.

Here's a step-by-step guide:

1. Create a Component for the 404 Page:

Create a new Vue component for the 404 page. For example, you can create a file named NotFound.vue in your src/components directory:

htmlCopy code
<template>
  <div class="not-found">
    <h1>404 Not Found</h1>
    <p>Sorry, the page you are looking for does not exist.</p>
  </div>
</template>

<script>
export default {
  name: 'NotFound'
}
</script>

<style scoped>
.not-found {
  text-align: center;
  margin-top: 50px;
}
</style>

2. Configure Routing:

Update your Vue Router configuration to redirect to the custom 404 page whenever a route is not found. You can do this by adding a wildcard route (*) that matches all paths and redirects to the NotFound component.

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// In your router configuration (usually in src/router/index.js)
import Vue from 'vue';
import VueRouter from 'vue-router';
import NotFound from '../components/NotFound.vue';

Vue.use(VueRouter);

const routes = [
  // Your existing routes
  // Add other routes as necessary
  {
    path: '*',
    component: NotFound
  }
];

const router = new VueRouter({
  mode: 'history',
  base: process.env.BASE_URL,
  routes
});

export default router;

Now, whenever a user navigates to a route that doesn't exist within your Vue application, they will be redirected to the custom 404 page.

3. Styling and Customization (Optional):

You can customize the NotFound.vue component to match the look and feel of your application by adding CSS styles and additional content as needed.

With these steps, you've successfully created a custom 404 error page in your Vue.js single-page application.