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nextjs - 💡(How to fix) Fix [Bug] Sitemap renders as HTML instead of XML when alternates are enabled [4 comments, 4 participants]

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vercel/next.js#86248•Fetched 2026-04-08 02:11:54
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Author
bennajahbennajah
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bennajahbennajahDebblDebblgithub-actions[bot]github-actions[bot]icyJosephicyJoseph
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Code Example

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 11 Pro
  Available memory (MB): 12244
  Available CPU cores: 8
Binaries:
  Node: 24.11.1
  npm: 11.6.2
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  next: 16.0.2-canary.23 // Latest available version is detected (16.0.2-canary.23).
  eslint-config-next: N/A
  react: 19.2.0
  react-dom: 19.2.0
  typescript: 5.9.3
Next.js Config:
  output: N/A
RAW_BUFFERClick to expand / collapse

Link to the code that reproduces this issue

https://github.com/bennajah/next-i18n

To Reproduce

  1. go to app/sitemap.ts
  2. set enableAlternate to true and visit http://localhost:3000/sitemap.xml you see this
<img width="742" height="568" alt="Image" src="https://github.com/user-attachments/assets/f04eec9d-331d-4320-95b3-cabfa443fba9" />
  1. set back enableAlternate to false and visit http://localhost:3000/sitemap.xml you see this
<img width="857" height="360" alt="Image" src="https://github.com/user-attachments/assets/15d2441c-6504-4eac-b965-2e72b9319c0c" />

Current vs. Expected behavior

enabling the alternates option inside the sitemap.ts configuration causes the generated sitemap.xml to render as an HTML document instead of a valid XML sitemap.

Provide environment information

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 11 Pro
  Available memory (MB): 12244
  Available CPU cores: 8
Binaries:
  Node: 24.11.1
  npm: 11.6.2
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  next: 16.0.2-canary.23 // Latest available version is detected (16.0.2-canary.23).
  eslint-config-next: N/A
  react: 19.2.0
  react-dom: 19.2.0
  typescript: 5.9.3
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

Internationalization (i18n)

Which stage(s) are affected? (Select all that apply)

next dev (local), next build (local)

Additional context

No response

extent analysis

TL;DR

  • Setting enableAlternate to true in app/sitemap.ts may require additional configuration to correctly generate a valid XML sitemap.

Guidance

  • Review the app/sitemap.ts configuration to ensure that the enableAlternate option is correctly implemented and compatible with the current Next.js version (16.0.2-canary.23).
  • Verify that the XML sitemap is being generated correctly when enableAlternate is set to false, and compare the differences in the generated sitemap when the option is set to true.
  • Check the Next.js documentation and the next-i18n library documentation for any specific requirements or guidelines for implementing the enableAlternate option.
  • Consider testing the sitemap generation with different configurations to isolate the issue and identify any potential workarounds.

Notes

  • The issue may be specific to the next-i18n library or the current Next.js version, so it's essential to review the documentation and any related issues or pull requests.
  • Without more information about the app/sitemap.ts configuration and the expected behavior, it's challenging to provide a more specific solution.

Recommendation

  • Apply workaround: Try setting enableAlternate to false or experiment with different configurations to find a working solution, as the root cause of the issue is unclear.

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