Nuxt•17mo ago

Nuxt 3 says 'product' is not defined but it is.

Here is a reproduction https://stackblitz.com/edit/github-bqbsvw?file=pages%2Fproducts%2F%5Bid%5D.vue I am following along with https://www.youtube.com/watch?v=L9suY4qAFrQ&list=PL4cUxeGkcC9haQlqdCQyYmL_27TesCGPC&index=10 and my code should be working, if I comment out any mention of product and refresh it works fine, if I then uncomment them then it will work for a bit before saying that 'product is undefined'. What am I doing wrong?

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10 Replies

Unknown User•17mo ago

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KittensmakemesmileOP•17mo ago

That doesn't seem to work for me. https://stackblitz.com/edit/nuxt-starter-nwtucc Can you share your fork with updated code?

Cue•17mo ago

What are you hoping to achieve by defining title, description, image, etc, in definePageMeta?

KittensmakemesmileOP•17mo ago

To define the page meta dynamically. I honestly didn't have much of a plan really, I'm new to nuxt 3 and the compostion api and seeing how things work.

Cue•17mo ago

I see. And where are you going to use those values?

KittensmakemesmileOP•17mo ago

I just want to get the products to render on the page, it's not that deep for me tbh. Without an error.

KittensmakemesmileOP•17mo ago

Here is a reddit post I made with an updated reproduction. https://www.reddit.com/r/Nuxt/comments/159thgc/nuxt_says_the_product_is_not_defined_but_it_is/

r/Nuxt - Nuxt says the 'product' is not defined but it is

1 vote and 8 comments so far on Reddit

KittensmakemesmileOP•17mo ago

It should called the API and render the details of the call into the page. That's it. It does that but it throws an error saying that "product" is undefined. To the point that the app crashes even when I;m not on the page. There isn't any more detail than that. Everything else can be removed, I don't really care, I just want the fetch to work as it should.

Cue•17mo ago

Correct, it does work as it should. You’re using definePageMeta incorrectly, which in turn throws error.

KittensmakemesmileOP•17mo ago

I see! Thanks for that you're amazing! For those that may find this later here is what I have learned: definePageMeta (https://nuxt.com/docs/guide/directory-structure/pages/#page-metadata) has nothing to do with the page metadata, at least from what I gather from the docs, in fact, they have an example that shows that defining SEO data inside of it will cause an error

<script setup lang="ts">
import { someData } from '~/utils/example'

const title = ref('')

definePageMeta({
  title,  // This will create an error
  someData
})
</script>

<script setup lang="ts">
import { someData } from '~/utils/example'

const title = ref('')

definePageMeta({
  title,  // This will create an error
  someData
})
</script>

What I wanted to use was useSeoMeta

useSeoMeta({
  title: product?.value.title,
  description: product?.value.description,
  ogImage: product?.value.image,
  ogDescription: product?.value.description,
  url: "https://nuxtjs.org",
});

useSeoMeta({
  title: product?.value.title,
  description: product?.value.description,
  ogImage: product?.value.image,
  ogDescription: product?.value.description,
  url: "https://nuxtjs.org",
});

https://nuxt.com/docs/api/composables/use-seo-meta Which produces the expected results. You're the best! Thanks!

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Nuxt 3 says 'product' is not defined but it is.