Route Guards in Angular

Guarding routes in Angular is a fundamental concept for securing and controlling access to specific routes within your application. Angular provides a powerful mechanism to protect routes using guards. Guards can be used to implement authentication, authorization, and other route protection mechanisms. In this explanation, I’ll provide a detailed overview of route guards in Angular with examples.

There are four types of route guards in Angular:

1. CanActivate:

• This guard determines whether a route can be activated. It’s commonly used for authentication and authorization checks before navigating to a route.

Example: Let’s create a simple AuthGuard to protect a route. Suppose you want to protect an admin panel route:

// auth.guard.ts
import { Injectable } from '@angular/core';
import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree, Router } from '@angular/router';
import { AuthService } from './auth.service';

@Injectable({
  providedIn: 'root'
})
export class AuthGuard implements CanActivate {
  constructor(private authService: AuthService, private router: Router) {}

  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot
  ): boolean | UrlTree {
    if (this.authService.isLoggedIn()) {
      return true;
    } else {
      // Redirect to the login page if not logged in
      return this.router.parseUrl('/login');
    }
  }
}

In this example, the AuthGuard checks if the user is logged in using the AuthService. If…