angular-guards
ALWAYS use when working with Angular Route Guards, CanActivate, CanDeactivate, CanLoad, or route protection in Angular applications.
What this skill does
# Angular Route Guards
**Version:** Angular 21 (2025)
**Tags:** Guards, Routing, Auth, CanActivate
**References:** [Guards Guide](https://angular.dev/guide/routing/router-tutorial#protecting-routes) • [CanActivate](https://angular.io/api/router/CanActivate)
## API Changes
This section documents recent version-specific API changes.
- NEW: Functional guards — Use `CanActivateFn` instead of class-based
- NEW: CanMatch guard — Prevent lazy loading of unauthorized code
- NEW: provideRouter with guards — Modern guard registration
- DEPRECATED: Class-based guards — Migrate to functional
## Best Practices
- Create functional guard
```ts
export const authGuard: CanActivateFn = () => {
const authService = inject(AuthService);
const router = inject(Router);
if (authService.isAuthenticated()) {
return true;
}
return router.createUrlTree(['/login']);
};
```
- Use CanActivate for route protection
```ts
const routes: Routes = [
{
path: 'dashboard',
canActivate: [authGuard],
component: DashboardComponent
}
];
```
- Use CanActivateChild for child routes
```ts
export const adminGuard: CanActivateChildFn = () => {
const auth = inject(AuthService);
return auth.isAdmin() || inject(Router).createUrlTree(['/unauthorized']);
};
const routes: Routes = [
{
path: 'admin',
canActivateChild: [adminGuard],
children: [...]
}
];
```
- Use CanMatch for lazy loading
```ts
const routes: Routes = [
{
path: 'admin',
canMatch: [authGuard],
loadComponent: () => import('./admin/admin.component')
}
];
```
- Use CanDeactivate for unsaved changes
```ts
export const canDeactivateGuard: CanDeactivateFn<CanComponentDeactivate> = (component) => {
if (component.hasUnsavedChanges?.()) {
return confirm('You have unsaved changes. Are you sure?');
}
return true;
};
```
- Use withComponentInputBinding
```ts
export const appConfig: ApplicationConfig = {
providers: [
provideRouter(routes, withComponentInputBinding())
]
};
```
- Use multiple guards
```ts
const routes: Routes = [
{
path: 'admin',
canActivate: [authGuard, adminGuard],
loadComponent: () => import('./admin/admin.component')
}
];
```
- Pass data to guards
```ts
const routes: Routes = [
{
path: 'user/:id',
canActivate: [userGuard],
data: { requiredRole: 'admin' }
}
];
export const userGuard: CanActivateFn = (route, state) => {
const requiredRole = route.data['requiredRole'];
// Check role
};
```
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