| name | clerk-common-errors |
| description | Troubleshoot common Clerk errors and issues.
Use when encountering authentication errors, SDK issues,
or configuration problems with Clerk.
Trigger with phrases like "clerk error", "clerk not working",
"clerk authentication failed", "clerk issue", "fix clerk".
|
| allowed-tools | Read, Write, Edit, Grep, Bash(npm:*) |
| version | 1.0.0 |
| license | MIT |
| author | Jeremy Longshore <jeremy@intentsolutions.io> |
Clerk Common Errors
Overview
Diagnose and resolve common Clerk authentication errors and issues.
Prerequisites
- Clerk SDK installed
- Access to Clerk dashboard for configuration checks
- Browser developer tools for debugging
Instructions
Error Category 1: Configuration Errors
Invalid API Key
Error: Clerk: Invalid API key
Cause: Publishable or secret key is incorrect or mismatched.
Solution:
cat -A .env.local | grep CLERK
echo $NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY
ClerkProvider Not Found
Error: useAuth can only be used within the <ClerkProvider /> component
Cause: Component using Clerk hooks is outside ClerkProvider.
Solution:
import { ClerkProvider } from '@clerk/nextjs'
export default function RootLayout({ children }) {
return (
<ClerkProvider>
<html><body>{children}</body></html>
</ClerkProvider>
)
}
Error Category 2: Authentication Errors
Session Not Found
Error: Session not found
Cause: User session expired or was revoked.
Solution:
const { userId } = await auth()
if (!userId) {
redirect('/sign-in')
}
Form Identifier Not Found
Error: form_identifier_not_found
Cause: Email/username not registered.
Solution:
catch (err: any) {
if (err.errors?.[0]?.code === 'form_identifier_not_found') {
setError('No account found with this email. Please sign up.')
}
}
Password Incorrect
Error: form_password_incorrect
Cause: Wrong password entered.
Solution:
catch (err: any) {
if (err.errors?.[0]?.code === 'form_password_incorrect') {
setError('Incorrect password. Try again or reset your password.')
}
}
Error Category 3: Middleware Errors
Infinite Redirect Loop
Error: Too many redirects
Cause: Middleware matcher includes sign-in page.
Solution:
const isPublicRoute = createRouteMatcher([
'/sign-in(.*)',
'/sign-up(.*)',
'/'
])
export default clerkMiddleware(async (auth, request) => {
if (!isPublicRoute(request)) {
await auth.protect()
}
})
Middleware Not Executing
Error: Routes not protected
Cause: Matcher not matching routes correctly.
Solution:
export const config = {
matcher: [
'/((?!_next|[^?]*\\.(?:html?|css|js|jpe?g|webp|png|gif|svg|ttf|woff2?|ico)).*)',
'/',
'/(api|trpc)(.*)'
]
}
Error Category 4: Server/Client Errors
Hydration Mismatch
Error: Text content does not match server-rendered HTML
Cause: Auth state differs between server and client.
Solution:
'use client'
import { useUser } from '@clerk/nextjs'
export function UserGreeting() {
const { user, isLoaded } = useUser()
if (!isLoaded) {
return <div>Loading...</div>
}
return <div>Hello, {user?.firstName}</div>
}
Cannot Read Properties of Undefined
Error: Cannot read properties of undefined (reading 'userId')
Cause: Using auth() in client component or non-server context.
Solution:
import { auth } from '@clerk/nextjs/server'
const { userId } = await auth()
'use client'
import { useAuth } from '@clerk/nextjs'
const { userId } = useAuth()
Error Category 5: Webhook Errors
Webhook Verification Failed
Error: Webhook signature verification failed
Cause: Incorrect webhook secret or missing headers.
Solution:
import { Webhook } from 'svix'
import { headers } from 'next/headers'
export async function POST(req: Request) {
const WEBHOOK_SECRET = process.env.CLERK_WEBHOOK_SECRET!
const headerPayload = await headers()
const svix_id = headerPayload.get('svix-id')
const svix_timestamp = headerPayload.get('svix-timestamp')
const svix_signature = headerPayload.get('svix-signature')
const body = await req.text()
const wh = new Webhook(WEBHOOK_SECRET)
const evt = wh.verify(body, {
'svix-id': svix_id!,
'svix-timestamp': svix_timestamp!,
'svix-signature': svix_signature!
})
}
Output
- Identified error category
- Root cause analysis
- Working solution code
Diagnostic Commands
npm list @clerk/nextjs
npx next info
npm list | grep clerk
rm -rf .next && npm run dev
Quick Reference Table
| Error Code | Meaning | Quick Fix |
|---|
form_identifier_not_found | User doesn't exist | Show sign-up link |
form_password_incorrect | Wrong password | Show reset link |
session_exists | Already logged in | Redirect to app |
verification_expired | Code expired | Resend code |
rate_limit_exceeded | Too many attempts | Wait and retry |
Resources
Next Steps
Proceed to clerk-debug-bundle for comprehensive debugging tools.
