Nuxt•2mo ago

undefined default value of data

is the undefined default value of data in useAsyncData() a Nuxt 4 feature? Or is it backwards compat with Nuxt 3?

2 Replies

Hi @Donald Biden. 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, the undefined default value for data in useAsyncData() is a Nuxt 4 feature, but it has been backported to Nuxt 3 as an opt-in change. Nuxt 4 Behavior In Nuxt 4, data and error objects returned from useAsyncData default to undefined. According to the Nuxt 4 upgrade guide, this change was made for greater consistency, as previously data was initialized to null but reset in clearNuxtData to undefined. Nuxt 3 Compatibility In Nuxt 3, the default behavior is still null for both data and error. However, you can opt into the Nuxt 4 behavior in Nuxt 3. According to the Nuxt 3 upgrade guide, if you encounter issues with the new undefined default, you can revert to the previous behavior with:

export default defineNuxtConfig({
  experimental: {
    defaults: {
      useAsyncData: {
        value: 'null',
        errorValue: 'null',
      },
    },
  },
})

export default defineNuxtConfig({
  experimental: {
    defaults: {
      useAsyncData: {
        value: 'null',
        errorValue: 'null',
      },
    },
  },
})

This configuration option suggests that the undefined default can be enabled in Nuxt 3 as an experimental feature, but it's the standard behavior in Nuxt 4. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2mo ago

<@1214688654199496797> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

Gaming

Programming

undefined default value of data

Did you find this page helpful?