N
Nuxt•3w ago
Solid

prevent useAsyncData from running in the browser

I am using useAsyncData to see if the user has permission to view the page. I have created a helper function that assists in doing so. It simply returns a promise evaluating to a boolean if the user has permission or not. This logic uses sequelize to make a database request in order to see if the user has permission. I have noticed that useAsyncData also executes on the client. This results in the client calling sequelize functions which relies on nodejs which makes the browser spit an error. 500 buffer not defined I have tried using import.meta to prevent the code from executing on the client but o import.meta variables would work and it would execute in the browser anyway. This is the current code 
<script setup>
    import { getSessionAllowedView } from '~/server/utils/session';
    const config = useRuntimeConfig()
    const session = useCookie('session', {sameSite: 'strict',domain:config.public.HOST_DOMAIN,secure:false})

    const {data, status} = await useAsyncData('protectedPage', async ()=>{
        if(import.meta.nitro||import.meta.dev||import.meta.server){
            return getSessionAllowedView(session.value,'pages_protected_view',1).then((res)=>{console.log(res);return res})
        }
    })
</script>
<script setup>
    import { getSessionAllowedView } from '~/server/utils/session';
    const config = useRuntimeConfig()
    const session = useCookie('session', {sameSite: 'strict',domain:config.public.HOST_DOMAIN,secure:false})

    const {data, status} = await useAsyncData('protectedPage', async ()=>{
        if(import.meta.nitro||import.meta.dev||import.meta.server){
            return getSessionAllowedView(session.value,'pages_protected_view',1).then((res)=>{console.log(res);return res})
        }
    })
</script>
11 Replies
kapa.ai
kapa.ai•3w ago
Hi @Solid. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- To prevent useAsyncData from running in the browser, you can use the server option set to true. This will ensure that the data fetching only occurs on the server side. Here's how you can modify your code: 
<script setup>
import { getSessionAllowedView } from '~/server/utils/session';
const config = useRuntimeConfig()
const session = useCookie('session', {sameSite: 'strict', domain: config.public.HOST_DOMAIN, secure: false})

const { data, status } = await useAsyncData('protectedPage', 
  () => getSessionAllowedView(session.value, 'pages_protected_view', 1),
  { server: true }
)
</script>
<script setup>
import { getSessionAllowedView } from '~/server/utils/session';
const config = useRuntimeConfig()
const session = useCookie('session', {sameSite: 'strict', domain: config.public.HOST_DOMAIN, secure: false})

const { data, status } = await useAsyncData('protectedPage', 
  () => getSessionAllowedView(session.value, 'pages_protected_view', 1),
  { server: true }
)
</script>
By adding { server: true } as the third argument to useAsyncData, you ensure that the function only runs on the server and not in the browser. This should prevent the "buffer not defined" error you're experiencing. Additionally, you can remove the import.meta check since it's no longer necessary with this approach. If you need to handle the case where the data is not available on the client side (because it was not fetched on the server), you can use the status value returned by useAsyncData to show a loading state or handle the absence of data appropriately in your template. For more information on the server option and other options available for useAsyncData, you can refer to the Nuxt Data Fetching documentation. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•3w ago
<@251792143608184832> Kapa.ai is still learning and improving, please let me know how I did by reacting below.
Solid
SolidOP•3w ago
@kapa.ai from what I understand from the documentation, the default value of the server option is what I would presume is 'true' seeing as there is only a case of 'client only fetching' where server is explicitly set to false. This default is as follows as according to the documentation "By default, data fetching composables will perform their asynchronous function on both client and server environments." setting it to true doesn't force it to only be executed on the server
kapa.ai
kapa.ai•3w ago
Let me check the knowledge base for you again. One moment! :books: ---------------------- You're correct, and I apologize for the confusion in my previous answer. Let me clarify based on the documentation: You're right that the default behavior of useAsyncData is to perform the asynchronous function on both client and server environments. Setting server: true doesn't force execution only on the server. Let's look at the relevant information from the documentation: Nuxt Data Fetching documentation states: "By default, data fetching composables will perform their asynchronous function on both client and server environments. Set the server option to false to only perform the call on the client-side." This means that setting server: true (which is the default) will indeed run the function on both server and client sides. To address your specific issue of preventing the function from running in the browser, you have a few options: 1. Use lazy: true option: 
   const { data, status } = await useAsyncData('protectedPage', 
     () => getSessionAllowedView(session.value, 'pages_protected_view', 1),
     { lazy: true }
   )
   
   const { data, status } = await useAsyncData('protectedPage', 
     () => getSessionAllowedView(session.value, 'pages_protected_view', 1),
     { lazy: true }
   )
This will prevent the request from firing immediately on the client side, but it will still be available for later use if needed. 2. Use a server-only plugin or middleware to handle the permission check. 3. Create a server route to handle the permission check and use useFetch to call it, which gives you more control over when and how the data is fetched. Remember, as mentioned in the Nuxt Data Fetching documentation, if you have not fetched data on the server (for example, with server: false), then the data will not be fetched until hydration completes on the client side. I apologize again for the confusion in my previous response. Thank you for bringing this to my attention, as it allows me to provide more accurate information. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•3w ago
<@251792143608184832> Kapa.ai is still learning and improving, please let me know how I did by reacting below.
Solid
SolidOP•3w ago
@kapa.ai setting lazy to true isn't an option. I am looking for ways to do server-side checks that should not run on the client. I prefer not to use plugins and also not middleware as I had the same issues with middleware. Is there no other option to ensure a page has a block of code that only executes on the server?
kapa.ai
kapa.ai•3w ago
Let me check the knowledge base for you again. One moment! :books: ---------------------- Based on your requirements and the information available in the knowledge sources, there are a couple of options you can consider to ensure that certain code only executes on the server side in Nuxt: 1. Use <ServerOnly> component: You can wrap the part of your template that depends on server-only data in a <ServerOnly> component. This component ensures that its content is only rendered on the server. Here's how you could use it: 
<template>
  <div>
    <ServerOnly>
      <!-- This will only be rendered on the server -->
      <div v-if="data">
        <!-- Display your protected data here -->
      </div>
    </ServerOnly>
  </div>
</template>

<script setup>
import { getSessionAllowedView } from '~/server/utils/session';
const config = useRuntimeConfig()
const session = useCookie('session', {sameSite: 'strict', domain: config.public.HOST_DOMAIN, secure: false})

const { data } = await useAsyncData('protectedPage', 
  () => getSessionAllowedView(session.value, 'pages_protected_view', 1)
)
</script>
<template>
  <div>
    <ServerOnly>
      <!-- This will only be rendered on the server -->
      <div v-if="data">
        <!-- Display your protected data here -->
      </div>
    </ServerOnly>
  </div>
</template>

<script setup>
import { getSessionAllowedView } from '~/server/utils/session';
const config = useRuntimeConfig()
const session = useCookie('session', {sameSite: 'strict', domain: config.public.HOST_DOMAIN, secure: false})

const { data } = await useAsyncData('protectedPage', 
  () => getSessionAllowedView(session.value, 'pages_protected_view', 1)
)
</script>
2. Use .server suffix for components: You can create a server-only component by adding the .server suffix to your component file name. This component will only be rendered on the server side. Here's an example: 
<!-- ProtectedContent.server.vue -->
<template>
  <div v-if="isAllowed">
    <!-- Your protected content here -->
  </div>
</template>

<script setup>
import { getSessionAllowedView } from '~/server/utils/session';
const config = useRuntimeConfig()
const session = useCookie('session', {sameSite: 'strict', domain: config.public.HOST_DOMAIN, secure: false})

const isAllowed = await getSessionAllowedView(session.value, 'pages_protected_view', 1)
</script>
<!-- ProtectedContent.server.vue -->
<template>
  <div v-if="isAllowed">
    <!-- Your protected content here -->
  </div>
</template>

<script setup>
import { getSessionAllowedView } from '~/server/utils/session';
const config = useRuntimeConfig()
const session = useCookie('session', {sameSite: 'strict', domain: config.public.HOST_DOMAIN, secure: false})

const isAllowed = await getSessionAllowedView(session.value, 'pages_protected_view', 1)
</script>
Then, in your main component: 
<template>
  <div>
    <ProtectedContent />
  </div>
</template>
<template>
  <div>
    <ProtectedContent />
  </div>
</template>
This approach ensures that the permission check and related logic only run on the server. These methods should allow you to perform server-side checks without running them on the client, and without using plugins or middleware. They leverage Nuxt's built-in features for server-only rendering. For more details on these approaches, you can refer to the Nuxt documentation on components. Remember that while these methods prevent the code from running on the client, you'll need to handle cases where the data isn't available client-side, possibly by using placeholders or loading states. Nuxt Documentation on Components ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•3w ago
<@251792143608184832> Kapa.ai is still learning and improving, please let me know how I did by reacting below.
Solid
SolidOP•3w ago
@kapa.ai Appending .server to the component prevents routing. The error is difficult to understand 
Vite server hmr 5 files in 6.686ms

 WARN  [Vue Router warn]: uncaught error during route navigation:


 ERROR  [vite-node] [ERR_LOAD_URL] /components/auth/AuthProtectedpage.vue

    at /components/auth/AuthProtectedpage.vue

  [cause]: [vite-node] [ERR_LOAD_URL] /components/auth/AuthProtectedpage.vue

      at /components/auth/AuthProtectedpage.vue


 WARN  [Vue Router warn]: uncaught error during route navigation:


 ERROR  [vite-node] [ERR_LOAD_URL] /components/auth/AuthProtectedpage.vue

    at /components/auth/AuthProtectedpage.vue

  [cause]: [vite-node] [ERR_LOAD_URL] /components/auth/AuthProtectedpage.vue

      at /components/auth/AuthProtectedpage.vue


 WARN  [Vue Router warn]: No match found for location with path "/_nuxt/components/auth/AuthProtectedpage.vue?t=1737393555283"


 WARN  [Vue Router warn]: No match found for location with path "/_nuxt/components/auth/AuthProtectedpage.vue"
Vite server hmr 5 files in 6.686ms

 WARN  [Vue Router warn]: uncaught error during route navigation:


 ERROR  [vite-node] [ERR_LOAD_URL] /components/auth/AuthProtectedpage.vue

    at /components/auth/AuthProtectedpage.vue

  [cause]: [vite-node] [ERR_LOAD_URL] /components/auth/AuthProtectedpage.vue

      at /components/auth/AuthProtectedpage.vue


 WARN  [Vue Router warn]: uncaught error during route navigation:


 ERROR  [vite-node] [ERR_LOAD_URL] /components/auth/AuthProtectedpage.vue

    at /components/auth/AuthProtectedpage.vue

  [cause]: [vite-node] [ERR_LOAD_URL] /components/auth/AuthProtectedpage.vue

      at /components/auth/AuthProtectedpage.vue


 WARN  [Vue Router warn]: No match found for location with path "/_nuxt/components/auth/AuthProtectedpage.vue?t=1737393555283"


 WARN  [Vue Router warn]: No match found for location with path "/_nuxt/components/auth/AuthProtectedpage.vue"
kapa.ai
kapa.ai•3w ago
Let me check the knowledge base for you again. One moment! :books: ---------------------- Based on the error message you've provided, it seems that appending .server to your component name is causing routing issues. This is likely because server components in Nuxt are not meant to be used directly in routing. Let me explain the problem and suggest an alternative approach. The error you're seeing is related to Vue Router trying to navigate to a server component, which is not the intended use case for server components in Nuxt. Instead of using a .server component directly in your routes, you should use server components within regular components or pages. Here's a better approach: 1. Create a server component for your protected content: 
<!-- components/auth/ProtectedContent.server.vue -->
<template>
  <div v-if="isAllowed">
    <!-- Your protected content here -->
  </div>
</template>

<script setup>
import { getSessionAllowedView } from '~/server/utils/session';
const config = useRuntimeConfig()
const session = useCookie('session', {sameSite: 'strict', domain: config.public.HOST_DOMAIN, secure: false})

const isAllowed = await getSessionAllowedView(session.value, 'pages_protected_view', 1)
</script>
<!-- components/auth/ProtectedContent.server.vue -->
<template>
  <div v-if="isAllowed">
    <!-- Your protected content here -->
  </div>
</template>

<script setup>
import { getSessionAllowedView } from '~/server/utils/session';
const config = useRuntimeConfig()
const session = useCookie('session', {sameSite: 'strict', domain: config.public.HOST_DOMAIN, secure: false})

const isAllowed = await getSessionAllowedView(session.value, 'pages_protected_view', 1)
</script>
2. Use this server component within a regular page component: 
<!-- pages/ProtectedPage.vue -->
<template>
  <div>
    <h1>Protected Page</h1>
    <ProtectedContent />
  </div>
</template>

<script setup>
// Any client-side logic can go here
</script>
<!-- pages/ProtectedPage.vue -->
<template>
  <div>
    <h1>Protected Page</h1>
    <ProtectedContent />
  </div>
</template>

<script setup>
// Any client-side logic can go here
</script>
This approach allows you to keep your server-only logic in the ProtectedContent.server.vue component while still having a regular page component that can be used for routing. Remember that server components are rendered on the server and their content is sent as HTML to the client. They can't be used for client-side navigation or dynamic rendering. If you need more control over when and how the protected content is loaded, you might want to consider using <ClientOnly> with a <Suspense> component to handle the asynchronous nature of the data fetching: 
<!-- pages/ProtectedPage.vue -->
<template>
  <div>
    <h1>Protected Page</h1>
    <ClientOnly>
      <Suspense>
        <ProtectedContent />
        <template #fallback>
          <p>Loading...</p>
        </template>
      </Suspense>
    </ClientOnly>
  </div>
</template>
<!-- pages/ProtectedPage.vue -->
<template>
  <div>
    <h1>Protected Page</h1>
    <ClientOnly>
      <Suspense>
        <ProtectedContent />
        <template #fallback>
          <p>Loading...</p>
        </template>
      </Suspense>
    </ClientOnly>
  </div>
</template>
This setup ensures that your protected content is only rendered on the server, while still allowing for proper routing and client-side navigation. For more information on server components and their usage, you can refer to the Nuxt documentation on components. Nuxt Documentation on Components ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•3w ago
<@251792143608184832> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

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