How to implement error handling in Vue.js

Error handling in Vue.js is an essential aspect of building robust and reliable applications. There are various ways to implement error handling in Vue.js. Here are some common approaches:

1. Global Error Handling with Vue.config.errorHandler: You can use the Vue.config.errorHandler to define a global error handler. This function will be called whenever an uncaught error occurs in any component.

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   Vue.config.errorHandler = function (err, vm, info) {
     // Handle the error
     console.error('Error:', err, 'VM:', vm, 'Info:', info);
   };
   

2. Error Capturing with errorCaptured Lifecycle Hook: Components have an errorCaptured lifecycle hook that allows you to capture errors in the child components. This hook is called when an error occurs in any child component.

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   export default {
     errorCaptured(err, vm, info) {
       // Handle the error
       console.error('Error:', err, 'VM:', vm, 'Info:', info);
       // Return false to stop propagation to the global error handler
       return false;
     },
   };
   

3. Using try-catch Blocks: You can use standard JavaScript try-catch blocks to handle errors within a specific method or lifecycle hook.

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   methods: {
     fetchData() {
       try {
         // Code that might throw an error
       } catch (error) {
         // Handle the error
         console.error('Error:', error);
       }
     },
   },
   

4. Axios Interceptors for API Requests: If you are using Axios for making HTTP requests, you can use interceptors to handle errors globally for all your API requests.

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   // Add a response interceptor
   axios.interceptors.response.use(
     response => response,
     error => {
       // Handle error
       console.error('API Error:', error);
       return Promise.reject(error);
     }
   );
   

5. Using a Plugin for Notification: You can use a notification plugin like Vue Toasted or Vue Notification to display user-friendly error messages.

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   // Example using Vue Toasted
   import Toasted from 'vue-toasted';
   
   Vue.use(Toasted, {
     position: 'top-center',
     duration: 3000,
   });
   
   // Usage
   this.$toasted.error('An error occurred!');