Resolving Type Error with Clerk Middleware in Next.js
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Understanding the Type Error
If you've encountered the error message indicating that '"@clerk/nextjs/server"' lacks an exported member named 'clerkMiddleware', there's no need to panic. The issue might be traced back to the middleware.ts file located in your project's root directory.
Error Message Example:
./middleware.ts:1:10
Type error: '"@clerk/nextjs/server"' has no exported member named 'clerkMiddleware'. Did you mean 'WithClerkMiddleware'?
> 1 | import { clerkMiddleware, createRouteMatcher } from '@clerk/nextjs/server';
^2 |
3 | const isProtectedRoute = createRouteMatcher([
4 | '/',
error Command failed with exit code 1.
Solution 1: Non-Beta Version
If you are not utilizing the beta version of the Next.js SDK, you should install Clerk using one of the following commands:
yarn add @clerk/nextjs
or
npm install @clerk/nextjs
or
pnpm add @clerk/nextjs
import { authMiddleware } from "@clerk/nextjs";
// For more information on configuring your Middleware, visit:
export default authMiddleware({
// Allow signed-out users to access the specified routes:
// publicRoutes: ['/anyone-can-visit-this-route'],
});
export const config = {
matcher: [
// Exclude static files and Next.js internals
"/((?!.+\.[\w]+$|_next).*)",
// Include files in the api or trpc folders
"/(api|trpc)(.*)"
]
};
Solution 2: Beta Version
If you're working with the beta version of the Next.js SDK, you can install Clerk with the following commands:
yarn add @clerk/nextjs@beta
or
npm install @clerk/nextjs@beta
or
pnpm add @clerk/nextjs@beta
import { clerkMiddleware } from "@clerk/nextjs/server";
export default clerkMiddleware();
export const config = {
matcher: ['/((?!.*\..*|_next).*)', '/', '/(api|trpc)(.*)'],
};
As you can see, the middleware setup varies depending on the version of Clerk you're using. Make sure to consult the official documentation for further guidance.
Examples of Middleware Configuration
If your package.json includes:
"dependencies": {
"@clerk/nextjs": "^4.29.12",
Your middleware.ts should reflect:
import { clerkMiddleware, createRouteMatcher } from '@clerk/nextjs/server';
const protectedRoute = createRouteMatcher([
'/',
]);
export default clerkMiddleware((auth, req) => {
if (protectedRoute(req)) auth().protect();
});
export const config = {
matcher: ['/((?!.+\.[\w]+$|_next).*)', '/', '/(api|trpc)(.*)'],
};
If you encounter the terminal error:
./middleware.ts:1:10
Type error: '"@clerk/nextjs/server"' has no exported member named 'clerkMiddleware'. Did you mean 'WithClerkMiddleware'?
Update your middleware.ts to:
import { authMiddleware } from "@clerk/nextjs";
export default authMiddleware({});
export const config = {
matcher: ['/((?!.+\.[\w]+$|_next).*)', '/', '/(api|trpc)(.*)'],
};
Then run:
yarn build
You should be able to access your project at http://localhost:3000 after executing:
yarn dev
Troubleshooting Tips
If you've adjusted your middleware.ts file according to the appropriate Clerk version but are still seeing an empty loading page at localhost:3000, double-check your middleware file. You might have mistakenly included:
import { authMiddleware } from "@clerk/nextjs";
export default authMiddleware({
publicRoutes: ['/'],
});
export const config = {
matcher: ['/((?!.+\.[\w]+$|_next).*)', '/', '/(api|trpc)(.*)'],
};
Replace it with:
import { authMiddleware } from "@clerk/nextjs";
export default authMiddleware({});
export const config = {
matcher: ['/((?!.+\.[\w]+$|_next).*)', '/', '/(api|trpc)(.*)'],
};
Conclusion
Thank you for reading through this guide! If you found it helpful, please consider clapping and following me for more content.
The first video discusses authentication methods in Next.js 13 using Clerk, providing essential insights on setup and configuration.
The second video explains how to synchronize Clerk authenticated users with your own database in Next.js 13, guiding you through the process effectively.
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