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When I set matcher: [""] to an empty array in middleware.ts. The development server crashed #57388

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masakinihirota opened this issue Oct 25, 2023 · 3 comments
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When I set matcher: [""] to an empty array in middleware.ts. The development server crashed #57388

masakinihirota opened this issue Oct 25, 2023 · 3 comments
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bug Issue was opened via the bug report template. Runtime Related to Node.js or Edge Runtime with Next.js. stale The issue has not seen recent activity.

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@masakinihirota
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Link to the code that reproduces this issue

https://github.com/masakinihirota/middleware-app

To Reproduce

Setting the matcher property of a middleware to an empty array cause the error message "Invalid middleware found" to be displayed and the development server to crash.

import { NextRequest, NextResponse } from "next/server";

export function middleware(request: NextRequest) {
  if (request.nextUrl.pathname === "/about") {
    return NextResponse.redirect(new URL("/redirected", request.url));
  }
  if (request.nextUrl.pathname === "/another") {
    return NextResponse.rewrite(new URL("/rewrite", request.url));
  }
  return NextResponse.next();
}

export const config = {
  matcher: [""],
  //       ^^^^
};


``

# step by step
[example]
https://github.com/vercel/next.js/tree/canary/examples/middleware

```terminal
pnpm create next-app --example middleware middleware-app
cd middleware-app
pnpm run dev

matcher: ['/about/:path*', '/another/:path*'],
↓ changed
matcher: [''],

`source` is missing for route {"source":""}


Error: Invalid middleware found

Current vs. Expected behavior

Avoid crashing the development server

Verify canary release

  • I verified that the issue exists in the latest Next.js canary release

Provide environment information

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 10 Pro
Binaries:
  Node: 18.17.1
  npm: N/A
  Yarn: N/A
  pnpm: 8.7.1
Relevant Packages:
  next: 13.5.6
  eslint-config-next: 12.2.0
  react: 18.2.0
  react-dom: 18.2.0
  typescript: 4.7.4
Next.js Config:
  output: N/A

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

Not sure, Middleware / Edge (API routes, runtime)

Additional context

No response
@masakinihirota masakinihirota added the bug Issue was opened via the bug report template. label Oct 25, 2023
@github-actions github-actions bot added the Runtime Related to Node.js or Edge Runtime with Next.js. label Oct 25, 2023
@masakinihirota
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middleware.ts config

OK

export const config = {};

export const config = {
matcher: [],
};

export const config = {
matcher: ["/"],
};

No Good

export const config = {
matcher: [""],
};

@nextjs-bot
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This issue has been automatically marked as stale due to two years of inactivity. It will be closed in 7 days unless there’s further input. If you believe this issue is still relevant, please leave a comment or provide updated details. Thank you.

@nextjs-bot nextjs-bot added the stale The issue has not seen recent activity. label Apr 22, 2025
@nextjs-bot
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This issue has been automatically closed due to two years of inactivity. If you’re still experiencing a similar problem or have additional details to share, please open a new issue following our current issue template. Your updated report helps us investigate and address concerns more efficiently. Thank you for your understanding!

@nextjs-bot nextjs-bot closed this as not planned Won't fix, can't repro, duplicate, stale Apr 29, 2025
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