useFetch's tranform equivalent for $fetch
What useFetch's tranform equivalent for $fetch?
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Hi @zigglearner1235. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
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In Nuxt, the transform option in useFetch allows you to modify the fetched data before it is returned and added to the payload. When using $fetch directly, there is no built-in transform option. However, you can achieve the same effect by simply applying your transformation logic after the $fetch call, since $fetch returns a Promise with the raw data.
For example, with useFetch:
With $fetch, you would do:
So, the equivalent of useFetch's transform for $fetch is to manually transform the result after the fetch call. There is no transform option built into $fetch itself, as it is a lower-level utility compared to useFetch, which is designed for SSR-safe data fetching and payload management in Nuxt Minimize payload size $fetch API.
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@kapa.ai what's the reason to have a transform option in useFetch then can't we do the same for that?
Let me check the knowledge base for you again. One moment! :books:
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The main reason for having a transform option in useFetch is to minimize the payload size that gets transferred from the server to the client during SSR (Server-Side Rendering) and hydration. When you use transform (or pick), the transformation is applied before the data is serialized and sent to the client. This means only the transformed (and typically smaller) data is included in the Nuxt payload, reducing the amount of data sent over the network and improving performance.
If you fetch data with $fetch and then transform it manually, the full untransformed data is still sent from the server to the client, which can be inefficient. The transform option in useFetch ensures that only the necessary data is included in the payload:
Both pick and transform don't prevent the unwanted data from being fetched initially. But they will prevent unwanted data from being added to the payload transferred from server to client.Minimize payload size So, while you can manually transform data after using $fetch, you lose the benefit of reducing the payload size during SSR, which is a key feature of useFetch's transform option. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
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