chore(nextjs): Updated URL for auth cant detect usage of clerkMiddleware

[royanger]

Description

This PR goes hand in hand with Docs PR 2273

The @clerk/nextjs error "Clerk: auth() was called but Clerk can't detect usage of clerkMiddleware()" is confusing to customers, and it would be hard to cover explaining links to missing static assets and fixing that in in the error.

This borrows from Next.js. The Docs PR includes a entire page covering the error and how to solve the reasons it can occur. This PR changes the link in the error from the Quickstart to the new page.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: b2d128a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@clerk/nextjs	Patch

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commit: b2d128a

[royanger]

Thanks for fixing the title/linting issue @tmilewski! Sorry I didn't get to it first.

I marked this blocked to make sure it doesn't get merged unless the Docs PR gets merged too. Appreciate the reviews Tom and @wobsoriano!

[jacekradko]

Love the idea of pointing this error to a dedicated troubleshooting page—it's a DX win for users! I do have one long‑term concern, though, which is link durability: once we ship a hard‑coded URL in the package, any future re‑org of docs risks breaking it.

I think it would be worthwhile to add a simple shortcode/redirect layer (e.g., https://clerk.com/err/auth-middleware) that resolves to the current canonical doc?

Benefits:

• Zero‑breakage moves – we can freely restructure docs without leaving old versions in place or touching package code.
• Analytics & A/B tests – centralized redirects make it trivial to measure hit counts or experiment with different help surfaces.
• Version targeting – shortcode could even branch based on SDK version or query param to surface the right docs

I think this would be very low hanging fruit but could give us a ton of flexibility and visibility into SDK error messages

[royanger]

Love the idea of pointing this error to a dedicated troubleshooting page—it's a DX win for users! I do have one long‑term concern, though, which is link durability: once we ship a hard‑coded URL in the package, any future re‑org of docs risks breaking it.

I think this is a great idea! Thanks for making it. I'm going to share with the docs team. The clerk repo handles redirects, so that would be easy to setup.

I updated to https://clerk.com/err/auth-middleware in 20b173a