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What are functional Route Guards, and how do they differ from class-based guards?

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01

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Explain functional route guards in modern Angular.

routingguards
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03

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Functional route guards are standard JavaScript functions registered as guards (e.g., return boolean or UrlTree). They utilize inject() to fetch dependencies, avoiding the boilerplate of class-based guards implementing interfaces, and are simpler to combine and reuse.

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04

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Functional route guard with inject()
import { inject } from '@angular/core';
import { Router, CanActivateFn } from '@angular/router';
import { AuthService } from './auth.service';

export const authGuard: CanActivateFn = (route, state) => {
  const authService = inject(AuthService);
  const router = inject(Router);

  if (authService.isAuthenticated()) {
    return true;
  }
  
  return router.parseUrl('/login');
};
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