Routing in Angular allows navigation between views. When you need to pass data during navigation, Angular’s routing state comes in handy. Here’s a practical guide with example code and best practices.

What is Routing State?

Angular’s Router allows passing state using the state property in NavigationExtras. This is useful for transferring temporary data.

Step-by-Step Example

1. Define Routes

const routes: Routes = [ { path: 'home', component: HomeComponent }, { path: 'details', component: DetailsComponent } ];

2. Navigate with State

this.router.navigate(['/details'], { state: { productId: 123, productName: 'Angular Guide' } });

3. Receive State

const navigation = this.router.getCurrentNavigation(); const state = navigation?.extras.state; if (state) { console.log('Product ID:', state['productId']); }

Note: Data passed via router state is only available during initial navigation, and will be lost on page refresh.

Best Practices

• Use for short-lived data
• Use services for global state
• Use localStorage or queryParams for persistent data

Conclusion

Routing state in Angular simplifies passing temporary data during component navigation. Use it wisely for transient data and pair it with more robust solutions when needed.