How do I implement async route guards in Vue Router?

How do I implement async route guards in Vue Router?

To implement async route guards in Vue Router, you can define a guard function that returns a Promise. This allows you to perform asynchronous operations before navigating to a route.

Can you show me a code example?

Sure! Here's a simple example:

const router = new VueRouter({
  routes: [
    {
      path: '/protected',
      component: ProtectedComponent,
      beforeEnter: (to, from, next) => {
        // Simulate an async check (e.g., API call)
        setTimeout(() => {
          const isAuthenticated = false; // Replace with actual auth check
          if (isAuthenticated) {
            next();
          } else {
            next('/login');
          }
        }, 1000);
      }
    }
  ]
});

This code checks if the user is authenticated before allowing access to the protected route.

What if I want to handle errors during the async operation?

You can handle errors by using a try-catch block or by rejecting the Promise. Here's an updated example:

beforeEnter: async (to, from, next) => {
  try {
    const isAuthenticated = await checkAuth(); // Assume checkAuth is an async function
    if (isAuthenticated) {
      next();
    } else {
      next('/login');
    }
  } catch (error) {
    console.error('Error during authentication check:', error);
    next('/error'); // Redirect to an error page
  }
}