Update index.ts

vue/spa-router/src/router/index.ts

@@ -16,7 +16,8 @@ const router = createRouter({
       // this generates a separate chunk (About.[hash].js) for this route
       // which is lazy-loaded when the route is visited.
       component: () => import('../views/AboutView.vue')
-    }
+    },
+    { path: '/:pathMatch(.*)', component: NotFoundComponent }
   ]
 })