N
Nuxt•4w ago
Felix

Hydration Error with useAsyncData

Hey, I am running code like this: 
<script setup ...>
const { data, status, error } = useAsyncData(() => ..., { server: false }) // fetch some data
</script>

<template>
  <template v-if="status === 'pending'>loading</template>
  <template v-else>ready</template>
</template>
<script setup ...>
const { data, status, error } = useAsyncData(() => ..., { server: false }) // fetch some data
</script>

<template>
  <template v-if="status === 'pending'>loading</template>
  <template v-else>ready</template>
</template>
but i am seeing hydration errros in the console and i cannot figure out why. any ideas?
2 Replies
kapa.ai
kapa.ai•4w ago
Hi @Felix. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- The hydration error you're experiencing is likely due to a mismatch between the server-rendered content and the client-side rendered content. This is happening because you're using useAsyncData with server: false, which means the data fetching only occurs on the client side. Here's why this causes a problem: 1. During server-side rendering, the status is initially 'idle', so neither 'loading' nor 'ready' is rendered. 2. On the client side, the data fetching starts, changing the status to 'pending', which then renders 'loading'. This difference between the server and client output causes the hydration mismatch. To resolve this issue, you have a few options: 1. Use useLazyAsyncData instead of useAsyncData. This will ensure that the data fetching doesn't start until after hydration is complete: 
<script setup>
const { data, status, error } = useLazyAsyncData(() => ..., { server: false })
</script>
<script setup>
const { data, status, error } = useLazyAsyncData(() => ..., { server: false })
</script>
2. If you need to use useAsyncData, you can handle the 'idle' state in your template: 
<template>
  <template v-if="status === 'idle' || status === 'pending'">loading</template>
  <template v-else>ready</template>
</template>
<template>
  <template v-if="status === 'idle' || status === 'pending'">loading</template>
  <template v-else>ready</template>
</template>
3. Another option is to use the lazy option instead of server: false: 
<script setup>
const { data, status, error } = useAsyncData(() => ..., { lazy: true })
</script>
<script setup>
const { data, status, error } = useAsyncData(() => ..., { lazy: true })
</script>
These approaches should help you avoid the hydration mismatch error. For more information on this topic, you can refer to: - Docs > Getting Started > Data Fetching - Docs > API > Composables > useAsyncData Remember, when using data fetching composables in Nuxt 3, it's important to consider both server-side and client-side rendering to avoid hydration mismatches. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•4w ago
<@223579303122567168> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

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