nextjs - 💡(How to fix) Fix Please allow me to export extra values from my routes [2 comments, 2 participants]

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vercel/next.js#87505Fetched 2026-04-08 02:06:55
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Error Message

Type error: Route "app/api/route.ts" does not match the required types of a Next.js Route. "SOMETHING" is not a valid Route export field.

Code Example

Type error: Route "app/api/route.ts" does not match the required types of a Next.js Route.
  "SOMETHING" is not a valid Route export field.

---

❯ next info

Operating System:
  Platform: linux
  Arch: x64
  Version: Ubuntu 20.04.0 LTS Sat Dec 20 2025 23:30:29 GMT+0900 (Japan Standard Time)
  Available memory (MB): NaN
  Available CPU cores: 8
Binaries:
  Node: 20.19.1
  npm: 10.8.2
  Yarn: 1.22.19
  pnpm: 8.15.6
Relevant Packages:
  next: 16.1.0 // Latest available version is detected (16.1.0).
  eslint-config-next: 13.5.1
  react: 18.2.0
  react-dom: 18.2.0
  typescript: 5.2.2
Next.js Config:
  output: N/A
RAW_BUFFERClick to expand / collapse

Link to the code that reproduces this issue

https://stackblitz.com/edit/nextjs-ru8yniyr?file=app%2Flayout.tsx

To Reproduce

  1. run npm install && npx next dev --webpack
  2. notice error

Current vs. Expected behavior

currently it outputs an error:

Type error: Route "app/api/route.ts" does not match the required types of a Next.js Route.
  "SOMETHING" is not a valid Route export field.

but it should not be raising a type error when I add EXTRA parameters.

Provide environment information

❯ next info

Operating System:
  Platform: linux
  Arch: x64
  Version: Ubuntu 20.04.0 LTS Sat Dec 20 2025 23:30:29 GMT+0900 (Japan Standard Time)
  Available memory (MB): NaN
  Available CPU cores: 8
Binaries:
  Node: 20.19.1
  npm: 10.8.2
  Yarn: 1.22.19
  pnpm: 8.15.6
Relevant Packages:
  next: 16.1.0 // Latest available version is detected (16.1.0).
  eslint-config-next: 13.5.1
  react: 18.2.0
  react-dom: 18.2.0
  typescript: 5.2.2
Next.js Config:
  output: N/A

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

Route Handlers

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

next build (local)

Additional context

I have a use-case where I want to export an extra argument from the route parameter for typing purposes. Please let me do this without raising an error.

extent analysis

TL;DR

Modify the route export to conform to the expected types of a Next.js Route by removing or renaming the "SOMETHING" field.

Guidance

  • Review the app/api/route.ts file to identify the "SOMETHING" field causing the type error and consider removing or renaming it to match the expected Route export fields.
  • Verify that the modified route export conforms to the Next.js Route types by checking the Next.js documentation or TypeScript type definitions.
  • If the extra parameter is necessary for typing purposes, consider using a different approach, such as using a separate type definition or interface, to avoid conflicting with the expected Route export fields.
  • Check the Next.js version (16.1.0) to see if there are any known issues or updates related to route exports and type checking.

Example

No code snippet is provided as the issue lacks specific code details, but reviewing the app/api/route.ts file and modifying the export to match the expected types should resolve the error.

Notes

The provided information suggests a type error related to the route export, but without more specific code details, it's difficult to provide a precise solution. The guidance provided is based on the error message and the information about the Next.js version and configuration.

Recommendation

Apply workaround: Modify the route export to conform to the expected types of a Next.js Route, as the current implementation is causing a type error. This should allow the code to compile without errors, although it may require additional changes to accommodate the desired typing purposes.

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