Failed to fetch dynamically imported module: _nuxt/CVb79eUW.js #32795
I'm experiencing a recurring issue in production with the following error:
Failed to fetch dynamically imported module: https://parafrasist.com/_nuxt/CVb79eUW.js
This error is very hard to reproduce, as it only happens to some users, based on what I see in Sentry logs. I haven’t been able to trigger it myself consistently.
🔍 SEO Impact
This issue is having a significant impact on my SEO:
- Googlebot sometimes encounters this error while crawling pages.
- As a result, Google detects soft 404s on some routes.
- In the SERP, some pages appear without the i18n translations (I'm using @nuxtjs/i18n).
- Certain pages are no longer being properly indexed.
- The last deployment was the Friday, so i can't think that it was related to new deployments.
🧪 What I've Tried
I've already tried using the experimental options:
experimental: {
asyncContext: true,
emitRouteChunkError: "automatic-immediate",
}
and also:
experimental: {
asyncContext: true,
emitRouteChunkError: "automatic",
}
But it seems the plugin or fallback isn’t working as expected.
🧩 Additional Context
I noticed this issue started happening after upgrading from Nuxt 3.10 to 3.17.7 — I had no such issues before the update.
Would you recommend creating the fallback plugin manually?
Any insights on how to make it more reliable or prevent Googlebot from hitting broken dynamic imports?
4 Replies
Hi @Carlosvaldes. 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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Your issue—
Failed to fetch dynamically imported module: _nuxt/CVb79eUW.js—is a known problem in Nuxt 3, especially after deployments or when JS chunks become unavailable. This can result in Googlebot encountering soft 404s, missing translations, and poor SEO outcomes. Here’s what the knowledge sources reveal:
Why This Happens
- Chunk Loading Errors: These typically occur when a new deployment invalidates old, hashed JS chunk URLs, or when a CDN/browser cache serves outdated HTML referencing non-existent JS files. Googlebot may cache HTML and later try to load JS chunks that no longer exist, leading to errors and soft 404s in Search Console. This is a widespread issue, not limited to Nuxt, and is exacerbated by how crawlers interact with cached content and JS budgets [GitHub PR #32137].
- Nuxt’s Built-in Handling: Nuxt provides built-in support for handling chunk loading errors by performing a hard reload when a chunk fails to load during route navigation. This is controlled by the experimental.emitRouteChunkError option. Setting it to "automatic" or "automatic-immediate" should enable this behavior, but there have been reports of regressions where the fallback does not always work as expected [Nuxt Docs: Error Handling] [GitHub Issue #32491].
SEO Impact
- Googlebot and Soft 404s: When Googlebot encounters these errors, it may index error pages or incomplete content, leading to soft 404s and missing translations (especially with i18n). This is a recognized issue and has been discussed in the Nuxt community [GitHub PR #32137].
What Has Been Done in Nuxt
- Suppression for Crawlers: A recent fix in Nuxt suppresses client-side errors triggered by crawlers/bots, preventing a full 500 error page from being rendered for them. This is a hotfix for the Googlebot issue, but it may not fully resolve all SEO impacts if the underlying chunk is missing [GitHub PR #32137].
- Manual Fallback: The Nuxt docs suggest you can handle chunk loading errors manually by setting experimental.emitRouteChunkError to "manual" and implementing your own handler. You can refer to the automatic implementation for ideas [Nuxt Docs: Error Handling].
Recommendations
1. Check CDN and Cache Settings: Ensure your CDN and browser cache settings do not serve outdated HTML referencing old JS chunks. This is a common cause of these errors persisting after deployment [GitHub Issue #32491].
2. Upgrade Nuxt: Make sure you are on the latest Nuxt 3 patch, as fixes for crawler-related errors have been added recently [GitHub PR #32137].
3. Manual Chunk Error Handling: If the built-in fallback is not working, consider implementing a manual handler for chunk loading errors. Set experimental.emitRouteChunkError to "manual" and use the pattern from the Nuxt chunk-reload plugin to trigger a reload or show a custom error message.
4. Monitor and Test: After making changes, monitor Google Search Console for improvements and test with Google’s crawler tools to ensure bots are not served broken pages.
Summary
- The issue is likely due to outdated or missing JS chunks after deployment, compounded by how Googlebot caches and revisits pages.
- Nuxt has introduced fixes to suppress errors for crawlers, but cache/CDN configuration and manual error handling may still be necessary.
- Implementing a custom chunk error handler and ensuring proper cache invalidation are your best bets for minimizing SEO impact.
If you need a code example for a manual chunk error handler, let me know!
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Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
----------------------<@811820521225453609> Kapa.ai is still learning and improving, please let me know how I did by reacting below.
Were you able to fully resolve this issue @Carlosvaldes ? It just happened to me. Now the title for google search results for my most frequented website page is: "500 - Internal Server Error | Nuxt". I think that manually submiting a re-crawl through search console will fix the issue but I would like to know if it's possible to fully resolve this issue. It happened for me using Nuxt v13.7.6, though now I've updated to v3.18.1 (website is served on Vercel).
I'd also be curious to learn if anyone has any suggestions on how to automatically monitor for this issue? (Instead of manually checking google search and/or the search console).