Angular provides robust mechanisms for handling errors in applications. Here's a guide to help you manage errors effectively:
🛠️ Introduction to Error Handling
When developing Angular apps, errors can occur in various scenarios like network issues, invalid data, or unexpected exceptions. Proper error handling ensures a better user experience and easier debugging.
- Local Error Handling: Use
try/catch
blocks in components/services - Global Error Handling: Implement
ErrorHandler
interface - Navigation Errors: Handle errors during routing with
NavigationErrorEvent
⚠️ Common Error Types
Error Type | Description | Example |
---|---|---|
HttpErrorResponse |
Errors from HTTP requests | catchError operator |
ErrorEvent |
Errors during navigation | NavigationErrorEvent |
ComponentErrors |
Errors within component logic | try...catch in lifecycle hooks |
📦 Handling Errors in Components
Use HttpClient
with error handling operators:
import { HttpClient } from '@angular/common/http';
import { catchError, throwError } from 'rxjs';
this.http.get('/api/data').pipe(
catchError((error) => {
console.error('API Error:', error);
return throwError(() => new Error('Something went wrong!'));
})
).subscribe(data => {
// Handle success
});
🌐 Global Error Handling
Implement a custom ErrorHandler
:
import { ErrorHandler, NgZone } from '@angular/core';
import { HttpException } from '@angular/common/http';
export class GlobalErrorHandler implements ErrorHandler {
constructor(private zone: NgZone) {}
handleError(error: any): void {
console.error('Global Error:', error);
this.zone.run(() => {
// Display error message to user
});
}
}
📚 Best Practices
- Use
Angular
's built-in error handling utilities - Log errors to a centralized service
- Show user-friendly messages instead of technical errors
- Test error scenarios with Angular's
TestBed
For more advanced error handling techniques, check out our Angular Advanced Features documentation. 🚀