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85 lines
2.5 KiB
Markdown
85 lines
2.5 KiB
Markdown
---
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title: 'useNuxtData'
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description: 'Access the current cached value of data fetching composables.'
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links:
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- label: Source
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icon: i-simple-icons-github
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to: https://github.com/nuxt/nuxt/blob/main/packages/nuxt/src/app/composables/asyncData.ts
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size: xs
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---
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::note
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`useNuxtData` gives you access to the current cached value of [`useAsyncData`](/docs/api/composables/use-async-data) , `useLazyAsyncData`, [`useFetch`](/docs/api/composables/use-fetch) and [`useLazyFetch`](/docs/api/composables/use-lazy-fetch) with explicitly provided key.
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::
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## Usage
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The example below shows how you can use cached data as a placeholder while the most recent data is being fetched from the server.
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```vue [pages/posts.vue]
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<script setup lang="ts">
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// We can access same data later using 'posts' key
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const { data } = await useFetch('/api/posts', { key: 'posts' })
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</script>
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```
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```vue [pages/posts/[id\\].vue]
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<script setup lang="ts">
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// Access to the cached value of useFetch in posts.vue (parent route)
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const { id } = useRoute().params
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const { data: posts } = useNuxtData('posts')
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const { data } = useLazyFetch(`/api/posts/${id}`, {
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key: `post-${id}`,
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default() {
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// Find the individual post from the cache and set it as the default value.
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return posts.value.find(post => post.id === id)
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}
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})
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</script>
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```
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## Optimistic Updates
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We can leverage the cache to update the UI after a mutation, while the data is being invalidated in the background.
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```vue [pages/todos.vue]
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<script setup lang="ts">
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// We can access same data later using 'todos' key
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const { data } = await useAsyncData('todos', () => $fetch('/api/todos'))
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</script>
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```
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```vue [components/NewTodo.vue]
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<script setup lang="ts">
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const newTodo = ref('')
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const previousTodos = ref([])
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// Access to the cached value of useAsyncData in todos.vue
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const { data: todos } = useNuxtData('todos')
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const { data } = await useFetch('/api/addTodo', {
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method: 'post',
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body: {
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todo: newTodo.value
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},
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onRequest () {
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previousTodos.value = todos.value // Store the previously cached value to restore if fetch fails.
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todos.value.push(newTodo.value) // Optimistically update the todos.
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},
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onRequestError () {
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todos.value = previousTodos.value // Rollback the data if the request failed.
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},
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async onResponse () {
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await refreshNuxtData('todos') // Invalidate todos in the background if the request succeeded.
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}
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})
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</script>
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```
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## Type
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```ts
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useNuxtData<DataT = any> (key: string): { data: Ref<DataT | null> }
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```
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