useNuxtData
useNuxtData gives you access to the current cached value of useAsyncData, useLazyAsyncData, useFetch and useLazyFetch with explicitly provided key.
Type
useNuxtData<DataT = any> (key: string): { data: Ref<DataT | null> }Examples
Show stale data while fetching in the background
The example below shows how you can use cached data as a placeholder while the most recent data is being fetched from the server.
archive.vue
// We can access same data later using 'posts' key
const { data } = await useFetch('/api/posts', { key: 'posts' })single.vue
// Access to the cached value of useFetch in archive.vue
const { data: posts } = useNuxtData('posts')
const { data } = await useFetch(`/api/posts/${postId}`, {
key: `post-${postId}`,
default: () => {
// Find the individual post from the cache and set it as the default value.
return posts.value.find(post => post.id === postId)
}
})Optimistic Updates
We can leverage the cache to update the UI after a mutation, while the data is being invalidated in the background.
todos.vue
// We can access same data later using 'todos' key
const { data } = await useFetch('/api/todos', { key: 'todos' })add-todo.vue
const newTodo = ref('')
const previousTodos = ref([])
// Access to the cached value of useFetch in todos.vue
const { data: todos } = useNuxtData('todos')
const { data } = await useFetch('/api/addTodo', {
key: 'addTodo',
method: 'post',
body: {
todo: newTodo.value
},
onRequest () {
previousTodos.value = todos.value // Store the previously cached value to restore if fetch fails.
todos.value.push(newTodo.value) // Optimistically update the todos.
},
onRequestError () {
todos.value = previousTodos.value // Rollback the data if the request failed.
},
async onResponse () {
await refreshNuxtData('todos') // Invalidate todos in the background if the request succeeded.
}
})