data fetching

ethan! · 2024-12-15T12:25:27.202Z

onMouted fetches every time i reroute to the main page but i only want it to run every time you reload any page

K

kapa.ai•12/15/24, 12:25 PM

Hi @ethan!. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

K

kapa.ai•12/15/24, 12:25 PM

----------------------
Based on the information provided in the knowledge sources, I can offer some guidance on data fetching in Nuxt and how to control when it occurs.

In Nuxt 3, the recommended approach for data fetching is to use the

useFetch

useFetch

or

useAsyncData

useAsyncData

composables. These composables are designed to fetch data only once in universal rendering, which means they won't refetch unnecessarily when navigating between pages.

However, if you're using

onMounted

onMounted

to fetch data, it will indeed run every time you navigate to the page. To address your specific issue, you have a few options:

Use
```
useFetch
```
```
useFetch
```
or
```
useAsyncData
```
```
useAsyncData
```
instead of
```
onMounted
```
```
onMounted
```
:
These composables are designed to handle caching and avoid unnecessary refetching. Here's an example:

   <script setup>
   const { data } = await useFetch('/api/data')
   </script>

   <script setup>
   const { data } = await useFetch('/api/data')
   </script>

   <script setup>
   const { data } = await useFetch('/api/data')
   </script>

   <script setup>
   const { data } = await useFetch('/api/data')
   </script>

This will fetch the data only when necessary, not on every route change.

If you need more control, you can use the
```
lazy
```
lazy
```
lazy
```
lazy
option with
```
useFetch
```
```
useFetch
```
:

   <script setup>
   const { data, refresh } = await useFetch('/api/data', { lazy: true })
   </script>

   <script setup>
   const { data, refresh } = await useFetch('/api/data', { lazy: true })
   </script>

   <script setup>
   const { data, refresh } = await useFetch('/api/data', { lazy: true })
   </script>

   <script setup>
   const { data, refresh } = await useFetch('/api/data', { lazy: true })
   </script>

This won't fetch the data immediately, allowing you to control when the fetch occurs.

If you specifically want to fetch data only on page reload and not on route changes, you can use a combination of
```
useFetch
```
```
useFetch
```
and checking the navigation type:

   <script setup>
   const { data, refresh } = await useFetch('/api/data', { 
     lazy: true,
     server: false
   })

   onMounted(() => {
     if (performance.getEntriesByType('navigation')[0].type === 'reload') {
       refresh()
     }
   })
   </script>

   <script setup>
   const { data, refresh } = await useFetch('/api/data', { 
     lazy: true,
     server: false
   })

   onMounted(() => {
     if (performance.getEntriesByType('navigation')[0].type === 'reload') {
       refresh()
     }
   })
   </script>

   <script setup>
   const { data, refresh } = await useFetch('/api/data', { 
     lazy: true,
     server: false
   })

   onMounted(() => {
     if (performance.getEntriesByType('navigation')[0].type === 'reload') {
       refresh()
     }
   })
   </script>

   <script setup>
   const { data, refresh } = await useFetch('/api/data', { 
     lazy: true,
     server: false
   })

   onMounted(() => {
     if (performance.getEntriesByType('navigation')[0].type === 'reload') {
       refresh()
     }
   })
   </script>

This setup will only fetch data when the page is reloaded, not on route changes.

K

kapa.ai•12/15/24, 12:25 PM

Remember that Nuxt's data fetching composables are designed to be efficient and avoid unnecessary network requests. If you're finding that data is being refetched too often, it's worth reviewing how you're using these composables and considering options like caching or lazy fetching.

For more detailed information on data fetching in Nuxt 3, you can refer to the Data Fetching documentation (https://nuxt.com/docs/getting-started/data-fetching).
----------------------
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
----------------------

K

kapa.ai•12/15/24, 12:25 PM

@495953543543521280 Kapa.ai is still learning and improving, please let me know how I did by reacting below.

E

ethan!OP•12/15/24, 12:26 PM

@kapa.ai please rerespond but keep in mind i cant use useFetch due to using a composable.

K

kapa.ai•12/15/24, 12:26 PM

Let me check the knowledge base for you again. One moment! :books:

K

kapa.ai•12/15/24, 12:26 PM

----------------------
I apologize for the confusion in my previous response. Given that you're using a composable and can't use

useFetch

useFetch

, let's explore alternative solutions that are more suitable for your situation.

Based on the knowledge sources, we can use

useAsyncData

useAsyncData

in this case.

useAsyncData

useAsyncData

is more flexible and can work with custom data fetching logic, including composables. Here's how you can approach this:

Use
```
useAsyncData
```
```
useAsyncData
```
with your composable:

   <script setup>
   const { data, refresh } = await useAsyncData(
     'uniqueKey',
     () => yourComposable()
   )
   </script>

   <script setup>
   const { data, refresh } = await useAsyncData(
     'uniqueKey',
     () => yourComposable()
   )
   </script>

   <script setup>
   const { data, refresh } = await useAsyncData(
     'uniqueKey',
     () => yourComposable()
   )
   </script>

   <script setup>
   const { data, refresh } = await useAsyncData(
     'uniqueKey',
     () => yourComposable()
   )
   </script>

This setup will ensure that the data is fetched only once during server-side rendering and initial client-side load, not on every route change.

If you want to control when the data is fetched, you can use the
```
lazy
```
lazy
```
lazy
```
lazy
option:

   <script setup>
   const { data, refresh } = await useAsyncData(
     'uniqueKey',
     () => yourComposable(),
     { lazy: true }
   )

   onMounted(() => {
     if (performance.getEntriesByType('navigation')[0].type === 'reload') {
       refresh()
     }
   })
   </script>

   <script setup>
   const { data, refresh } = await useAsyncData(
     'uniqueKey',
     () => yourComposable(),
     { lazy: true }
   )

   onMounted(() => {
     if (performance.getEntriesByType('navigation')[0].type === 'reload') {
       refresh()
     }
   })
   </script>

   <script setup>
   const { data, refresh } = await useAsyncData(
     'uniqueKey',
     () => yourComposable(),
     { lazy: true }
   )

   onMounted(() => {
     if (performance.getEntriesByType('navigation')[0].type === 'reload') {
       refresh()
     }
   })
   </script>

   <script setup>
   const { data, refresh } = await useAsyncData(
     'uniqueKey',
     () => yourComposable(),
     { lazy: true }
   )

   onMounted(() => {
     if (performance.getEntriesByType('navigation')[0].type === 'reload') {
       refresh()
     }
   })
   </script>

This will only fetch data when the page is reloaded, not on route changes.

If you need even more control, you can create a custom wrapper around
```
useAsyncData
```
```
useAsyncData
```
:

   <script setup>
   function useCustomAsyncData(key, handler) {
     const { data, refresh } = useAsyncData(key, handler, { lazy: true })

     onMounted(() => {
       if (performance.getEntriesByType('navigation')[0].type === 'reload') {
         refresh()
       }
     })

     return { data, refresh }
   }

   const { data, refresh } = useCustomAsyncData('uniqueKey', () => yourComposable())
   </script>

   <script setup>
   function useCustomAsyncData(key, handler) {
     const { data, refresh } = useAsyncData(key, handler, { lazy: true })

     onMounted(() => {
       if (performance.getEntriesByType('navigation')[0].type === 'reload') {
         refresh()
       }
     })

     return { data, refresh }
   }

   const { data, refresh } = useCustomAsyncData('uniqueKey', () => yourComposable())
   </script>

   <script setup>
   function useCustomAsyncData(key, handler) {
     const { data, refresh } = useAsyncData(key, handler, { lazy: true })

     onMounted(() => {
       if (performance.getEntriesByType('navigation')[0].type === 'reload') {
         refresh()
       }
     })

     return { data, refresh }
   }

   const { data, refresh } = useCustomAsyncData('uniqueKey', () => yourComposable())
   </script>

   <script setup>
   function useCustomAsyncData(key, handler) {
     const { data, refresh } = useAsyncData(key, handler, { lazy: true })

     onMounted(() => {
       if (performance.getEntriesByType('navigation')[0].type === 'reload') {
         refresh()
       }
     })

     return { data, refresh }
   }

   const { data, refresh } = useCustomAsyncData('uniqueKey', () => yourComposable())
   </script>

This custom wrapper will ensure that the data is only fetched on page reload, not on route changes.

K

kapa.ai•12/15/24, 12:26 PM

Remember,

useAsyncData

useAsyncData

is designed to work with any asynchronous function, including custom composables. It provides the same benefits as

useFetch

useFetch

in terms of SSR compatibility and avoiding unnecessary refetches.

For more information on using

useAsyncData

useAsyncData

, you can refer to the Nuxt documentation on useAsyncData (https://nuxt.com/docs/api/composables/use-async-data).
----------------------
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
----------------------

K

kapa.ai•12/15/24, 12:27 PM

@495953543543521280 Kapa.ai is still learning and improving, please let me know how I did by reacting below.

E

ethan!OP•12/15/24, 12:33 PM

@kapa.ai how do i send my cookies

K

kapa.ai•12/15/24, 12:33 PM

Let me check the knowledge base for you again. One moment! :books:

K

kapa.ai•12/15/24, 12:33 PM

----------------------
To send cookies in Nuxt 3, you have several options depending on your specific use case. Here are some approaches based on the provided knowledge sources:

Using
```
useRequestHeaders
```
```
useRequestHeaders
```
:
If you need to pass client headers, including cookies, to an API during server-side rendering, you can use the
```
useRequestHeaders
```
```
useRequestHeaders
```
composable:

   <script setup lang="ts">
   const headers = useRequestHeaders(['cookie'])
   const { data } = await useFetch('/api/me', { headers })
   </script>

   <script setup lang="ts">
   const headers = useRequestHeaders(['cookie'])
   const { data } = await useFetch('/api/me', { headers })
   </script>

   <script setup lang="ts">
   const headers = useRequestHeaders(['cookie'])
   const { data } = await useFetch('/api/me', { headers })
   </script>

   <script setup lang="ts">
   const headers = useRequestHeaders(['cookie'])
   const { data } = await useFetch('/api/me', { headers })
   </script>

This method is described in the Data Fetching documentation (https://nuxt.com/docs/getting-started/data-fetching#passing-headers-and-cookies).

Using
```
useRequestFetch
```
```
useRequestFetch
```
:
For forwarding request context and headers in server-side fetch requests, you can use the
```
useRequestFetch
```
```
useRequestFetch
```
composable:

   <script setup lang="ts">
   const requestFetch = useRequestFetch()
   const { data: forwarded } = await useAsyncData(() => requestFetch('/api/cookies'))
   </script>

   <script setup lang="ts">
   const requestFetch = useRequestFetch()
   const { data: forwarded } = await useAsyncData(() => requestFetch('/api/cookies'))
   </script>

   <script setup lang="ts">
   const requestFetch = useRequestFetch()
   const { data: forwarded } = await useAsyncData(() => requestFetch('/api/cookies'))
   </script>

   <script setup lang="ts">
   const requestFetch = useRequestFetch()
   const { data: forwarded } = await useAsyncData(() => requestFetch('/api/cookies'))
   </script>

This approach is detailed in the useRequestFetch documentation (https://nuxt.com/docs/api/composables/use-request-fetch).

Using
```
useCookie
```
useCookie
```
useCookie
```
useCookie
:
For reading and writing cookies in an SSR-friendly way, you can use the
```
useCookie
```
useCookie
```
useCookie
```
useCookie
composable:

   <script setup lang="ts">
   const cookie = useCookie('myCookie')
   cookie.value = 'myValue'
   </script>

   <script setup lang="ts">
   const cookie = useCookie('myCookie')
   cookie.value = 'myValue'
   </script>

   <script setup lang="ts">
   const cookie = useCookie('myCookie')
   cookie.value = 'myValue'
   </script>

   <script setup lang="ts">
   const cookie = useCookie('myCookie')
   cookie.value = 'myValue'
   </script>

This method is explained in the useCookie documentation (https://nuxt.com/docs/api/composables/use-cookie).

In API routes:
If you're working with server API routes, you can use
```
getCookie
```
getCookie
```
getCookie
```
getCookie
and
```
setCookie
```
setCookie
```
setCookie
```
setCookie
from the
```
h3
```
h3
```
h3
```
h3
package:

   export default defineEventHandler(event => {
     let counter = getCookie(event, 'counter') || 0
     setCookie(event, 'counter', ++counter)
     return { counter }
   })

   export default defineEventHandler(event => {
     let counter = getCookie(event, 'counter') || 0
     setCookie(event, 'counter', ++counter)
     return { counter }
   })

   export default defineEventHandler(event => {
     let counter = getCookie(event, 'counter') || 0
     setCookie(event, 'counter', ++counter)
     return { counter }
   })

   export default defineEventHandler(event => {
     let counter = getCookie(event, 'counter') || 0
     setCookie(event, 'counter', ++counter)
     return { counter }
   })

K

kapa.ai•12/15/24, 12:33 PM

This approach is described in the Cookies in API Routes section (https://nuxt.com/docs/api/composables/use-cookie#cookies-in-api-routes).

Remember to be cautious when forwarding headers, especially to external APIs. Only include the headers you need, as some headers are not safe to be bypassed and might introduce unwanted behavior.

For more detailed information and examples, you can refer to the useCookie documentation (https://nuxt.com/docs/api/composables/use-cookie) and the Data Fetching documentation (https://nuxt.com/docs/getting-started/data-fetching#passing-headers-and-cookies).
----------------------
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
----------------------

K

kapa.ai•12/15/24, 12:33 PM

@495953543543521280 Kapa.ai is still learning and improving, please let me know how I did by reacting below.

data fetching

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