N
Nuxt•5d ago
Kernel Panic

How to prevent duplicate API endpoint calls being made from within a component?

In a summary, these are the related factors: - Page containing component and uses default layout, - Component within page uses pinia store to fetch data via useAsyncData - Pina store loaded in the component and retrieves data via a custom fetch - Plugin adds a custom fetch and used in the pinia store - Default layout that has the page content if not loading, or loading spinner if loading (loading is determined from loading pinia store) - loading store that triggers a loading spinner in the layout When the component fetches the data via useAsyncData, the call repeats itself. Even if i use a key, it is still repeating itself. It does successfully fetch the data, however it is always fetching it twice. I believe this could be due to the loading spinner on the layout page which causes a re-render. It is preferred that the data is loaded on the client side, so a loading spinner was implemented. Is this a good approach? Is there a better approach? Possible examples somewhere I can learn from? How can I prevent duplicate calls from being made, and preferably not a hack, but setting this all up the right way. Thank you.
3 Replies
kapa.ai
kapa.ai•5d ago
Hi @Kernel Panic. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- Based on the knowledge sources, I can help you understand why duplicate API calls are occurring and how to prevent them. Understanding the Issue Your duplicate API calls likely stem from a few potential causes: 1. Layout and Component Interaction: When a page uses a layout, useAsyncData and useFetch can run requests twice (both server and client-side) as mentioned in a GitHub issue about this behavior. 2. Reactive Properties in Fetch Body: If you're passing reactive properties to useFetch or useAsyncData, any changes to these properties will trigger new requests, as noted in a Stack Overflow post. 3. Side Effects in Handler Function: Using useAsyncData for triggering side effects like Pinia actions can cause unintended behavior and repeated executions with nullish values, as mentioned in a GitHub PR. Solutions to Prevent Duplicate Calls 1. Use Proper Deduplication useAsyncData has a dedupe option that can help prevent duplicate requests: 
const { data } = await useAsyncData('uniqueKey', () => fetchFunction(), {
  dedupe: 'cancel' // Default option, cancels existing requests when a new one is made
  // Alternative: dedupe: 'defer' - does not make new requests if there's a pending request
})
const { data } = await useAsyncData('uniqueKey', () => fetchFunction(), {
  dedupe: 'cancel' // Default option, cancels existing requests when a new one is made
  // Alternative: dedupe: 'defer' - does not make new requests if there's a pending request
})
2. Use Static Keys Always provide a unique static key as the first parameter to useAsyncData: 
const { data } = await useAsyncData(
  'unique-static-key', 
  () => yourPiniaStore.fetchData()
)
const { data } = await useAsyncData(
  'unique-static-key', 
  () => yourPiniaStore.fetchData()
)
This helps Nuxt properly cache and deduplicate requests, as explained in the data fetching documentation. 3. Avoid Reactive Properties in Request Parameters If you're passing reactive properties to your fetch function, consider using JSON.stringify() to create a static copy: 
// Instead of this (which may cause re-fetches)
const { data } = await useAsyncData('key', () => fetchWithReactiveBody(reactiveBody))

// Do this
const { data } = await useAsyncData('key', () => fetchWithReactiveBody(JSON.stringify(reactiveBody)))
// Instead of this (which may cause re-fetches)
const { data } = await useAsyncData('key', () => fetchWithReactiveBody(reactiveBody))

// Do this
const { data } = await useAsyncData('key', () => fetchWithReactiveBody(JSON.stringify(reactiveBody)))
4. Consider Using useLazyFetch for Client-Side Loading Since you mentioned preferring client-side loading: 
const { data, status } = useLazyFetch('/api/endpoint', {
  // options
})
const { data, status } = useLazyFetch('/api/endpoint', {
  // options
})
This approach was mentioned as a solution in the GitHub issue about duplicate fetches. 5. Separate Data Fetching from Side Effects Don't use useAsyncData to trigger Pinia actions that don't return data. Instead, use the callOnce utility for side effects: 
// Don't do this
await useAsyncData(() => piniaStore.actionThatDoesntReturnData())

// Do this instead
callOnce(() => piniaStore.actionThatDoesntReturnData())
// Don't do this
await useAsyncData(() => piniaStore.actionThatDoesntReturnData())

// Do this instead
callOnce(() => piniaStore.actionThatDoesntReturnData())
Best Practices 1. Clear Separation of Concerns: Keep data fetching separate from UI state management. 2. Use Proper Keys: Always use explicit, unique keys for useAsyncData calls. 3. Watch for Changes: If you need to refetch when values change, use the watch option: 
const id = ref(1)
const { data } = await useAsyncData(
  `item-${id.value}`,
  () => fetchItem(id.value),
  { watch: [id] }
)
const id = ref(1)
const { data } = await useAsyncData(
  `item-${id.value}`,
  () => fetchItem(id.value),
  { watch: [id] }
)
4. Consider Manual Control: Use the refresh/execute functions returned by useAsyncData to manually control when data is refetched. These approaches should help you prevent duplicate API calls while maintaining a clean architecture in your Nuxt application. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•5d ago
<@246664150514663425> Kapa.ai is still learning and improving, please let me know how I did by reacting below.
Kernel Panic
Kernel PanicOP•5d ago
How would useLazyFetch work with a custom fetch plugin?

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