How can I implement async route guards in Vue Router?

How can I implement async route guards in Vue Router?

You can implement async route guards in Vue Router by returning a Promise in your guard function. This allows you to perform asynchronous operations before navigating to a route.

Can you show me an example of an async route guard?

Sure! Here's a simple example:

const router = new VueRouter({
  routes: [
    {
      path: '/protected',
      component: ProtectedComponent,
      beforeEnter: (to, from, next) => {
        checkAuth().then(isAuthenticated => {
          if (isAuthenticated) {
            next();
          } else {
            next('/login');
          }
        });
      }
    }
  ]
});

In this example, checkAuth is an async function that checks if the user is authenticated.

What happens if the async operation fails?

If the async operation fails, you can handle it in the catch block of the Promise. For example, you might redirect the user to an error page or show a notification.

Are there any best practices for using async route guards?

Yes, some best practices include keeping your guards lightweight, handling errors gracefully, and avoiding unnecessary async calls to improve performance.