N
Nuxt•19h ago
Kumzy

Error prerendering site

Hello, I have an error when prerendering the website on a page but I am struggling finding the root cause of it Errors prerendering: ├─ /plugins/advanced-alchemy (34ms) nitro 6:29:32 PM │ ├── [500] Server Error │ └── Linked from / │ └── Linked from /plugins │ └── Linked from /plugins?category=Official │ └── Linked from /plugins?category=Database nitro 6:29:32 PM ERROR Exiting due to prerender errors. 6:29:32 PM at prerender (node_modules/.pnpm/nitropack@2.12.5_better-sqlite3@12.2.0_rolldown@1.0.0-beta.34/node_modules/nitropack/dist/core/index.mjs:2206:11) at async nodemodules/.pnpm/nuxt@4.1.0@parcel+watcher@2.5.1@types+node@24.3.0@vue+compiler-sfc@3.5.21_better-sql_00a1e5bf5c29a539feb3c5e8e52e39aa/node_modules/nuxt/dist/index.mjs:4561:5 at async build (nodemodules/.pnpm/nuxt@4.1.0@parcel+watcher@2.5.1@types+node@24.3.0@vue+compiler-sfc@3.5.21_better-sql_00a1e5bf5c29a539feb3c5e8e52e39aa/node_modules/nuxt/dist/index.mjs:7207:3) at async Object.run (node_modules/.pnpm/@nuxt+cli@3.28.0_magicast@0.3.5/node_modules/@nuxt/cli/dist/chunks/build.mjs:76:5) at async Object.run (node_modules/.pnpm/@nuxt+cli@3.28.0_magicast@0.3.5/node_modules/@nuxt/cli/dist/chunks/generate.mjs:38:5) at async runCommand (node_modules/.pnpm/citty@0.1.6/node_modules/citty/dist/index.mjs:316:16) at async runCommand (node_modules/.pnpm/citty@0.1.6/node_modules/citty/dist/index.mjs:307:11) at async runMain (node_modules/.pnpm/citty@0.1.6/node_modules/citty/dist/index.mjs:445:7) ERROR Exiting due to prerender errors. 6:29:32 PM
5 Replies
kapa.ai
kapa.ai•19h ago
Hi @Kumzy. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- The error message you’re seeing during prerendering—specifically a [500] Server Error on /plugins/advanced-alchemy—indicates that something is failing when Nuxt tries to statically generate that route. Here are some steps and considerations based on the official Nuxt documentation and related sources: 1. Prerendering Fails on Server Errors:
When Nuxt prerenders your site (using nuxt generate or nuxt build --prerender), it will crawl your routes and try to render them as static HTML. If any route throws a server error (500), the build will fail and output an error like the one you see. This is by design to ensure your static site doesn’t have broken pages. The error log also shows the chain of links leading to the problematic route, which can help you trace how it’s being discovered by the crawler [Prerendering Docs]. 2. Debugging the Error:
- Check the Route: Try running your Nuxt app in development mode and visit /plugins/advanced-alchemy directly. See if you get an error in the browser or in the server logs. - Check for Data Fetching Issues: If the page fetches data (e.g., from an API or database), ensure that the data source is available and not returning errors during the build process. - Check for Environment Differences: Sometimes, code that works in development fails during prerendering due to missing environment variables, unavailable APIs, or differences in authentication. Make sure all required environment variables and services are available during the build. 3. Improved Error Logging:
Recent Nuxt versions have improved error logging during prerendering, printing out stack traces and full error messages to help you debug issues more easily. Check your build logs for detailed error output that might point to the root cause [Logging Improvements]. 4. Common Causes:
- Middleware or Auth: If you have middleware (such as authentication) that blocks access to certain routes during build, it can cause 401 or 500 errors. For example, a user reported a similar issue caused by basic auth middleware being active during the build on staging but not in production [DigitalOcean 401 Issue]. - Dynamic Data: If the route depends on dynamic data that isn’t available or fails to load during the build, it will cause a prerender error. 5. How to Proceed:
- Check the actual error output in your build logs for more details. - Temporarily remove or adjust middleware that could block access during prerendering. - Ensure all APIs and data sources are accessible during the build. - If the route is not meant to be prerendered, you can exclude it using the nitro.prerender.ignore option in your nuxt.config.ts: 
     export default defineNuxtConfig({
       nitro: {
         prerender: {
           ignore: ['/plugins/advanced-alchemy'],
         },
       },
     })
     
     export default defineNuxtConfig({
       nitro: {
         prerender: {
           ignore: ['/plugins/advanced-alchemy'],
         },
       },
     })
If you need more targeted help, try running the build with verbose logging (--logLevel=verbose) to get more context on the error. If you provide more details from the error logs or about what /plugins/advanced-alchemy does, I can help you further. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•19h ago
<@238709222005669888> Kapa.ai is still learning and improving, please let me know how I did by reacting below.
Kumzy
KumzyOP•19h ago
@kapa.ai the data is loaded from a local file I am using nuxt content there (it's in the [slug].vue file) 
const route = useRoute()

const { default: pluginsData } = await import('~/data/plugins.json')
const plugin = ref<Plugin | null>(pluginsData.find((p: Plugin) => p.key === route.params.slug) || null)
const route = useRoute()

const { default: pluginsData } = await import('~/data/plugins.json')
const plugin = ref<Plugin | null>(pluginsData.find((p: Plugin) => p.key === route.params.slug) || null)
kapa.ai
kapa.ai•19h ago
Let me check the knowledge base for you again. One moment! :books: ---------------------- Given your code and the context that you are using Nuxt Content and loading data from a local JSON file in a dynamic [slug].vue page, here are some points and troubleshooting steps based on the knowledge sources: 1. Local JSON Data Loading Your code: 
const route = useRoute()

const { default: pluginsData } = await import('~/data/plugins.json')
const plugin = ref<Plugin | null>(pluginsData.find((p: Plugin) => p.key === route.params.slug) || null)
const route = useRoute()

const { default: pluginsData } = await import('~/data/plugins.json')
const plugin = ref<Plugin | null>(pluginsData.find((p: Plugin) => p.key === route.params.slug) || null)
This approach should generally work for loading static JSON data at build/prerender time, as long as the file exists and is accessible. 2. Prerendering and Dynamic Routes Nuxt's prerendering will attempt to generate all routes it discovers, including dynamic ones like /plugins/[slug]. If a particular slug does not exist in your plugins.json, plugin will be null, which could cause your page to throw an error if you don't handle the "not found" case gracefully. This would result in a 500 error during prerendering [Prerendering Docs]. 3. Error Handling Make sure your page handles the case where the plugin is not found. For example: 
<template>
  <div v-if="plugin">
    <!-- plugin details -->
  </div>
  <div v-else>
    <p>Plugin not found.</p>
  </div>
</template>
<template>
  <div v-if="plugin">
    <!-- plugin details -->
  </div>
  <div v-else>
    <p>Plugin not found.</p>
  </div>
</template>
If you throw an error or try to access properties of null, it will cause a server error during prerendering. 4. Prerendering All Slugs Nuxt's crawler will only prerender dynamic routes it can discover via links or those you explicitly specify. If you want to ensure all plugin pages are prerendered, you should add all slugs to the nitro.prerender.routes array in your nuxt.config.ts: 
export default defineNuxtConfig({
  nitro: {
    prerender: {
      routes: pluginsData.map((p) => `/plugins/${p.key}`),
    },
  },
})
export default defineNuxtConfig({
  nitro: {
    prerender: {
      routes: pluginsData.map((p) => `/plugins/${p.key}`),
    },
  },
})
You may need to import your JSON file in the config to generate this array. 5. Nuxt Content and JSON If you are using Nuxt Content, you can define a data collection from JSON and query it using queryCollection instead of importing the file directly. This is the recommended approach for structured data with Nuxt Content [Nuxt Content JSON]. 6. Summary - Ensure your [slug].vue handles missing data gracefully. - Make sure all valid slugs are discoverable by the prerenderer (either via links or prerender.routes). - Consider using Nuxt Content's data querying features for better integration. If you still get a 500 error, check if the slug being prerendered actually exists in your JSON file and that your code does not throw when plugin is null. If the error persists and you need to exclude certain routes, you can use the nitro.prerender.ignore option [Prerendering Docs]. If you need more details on using Nuxt Content with JSON, see the official docs. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•19h ago
<@238709222005669888> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

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