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jeremylongshore

clerk-common-errors

by jeremylongshore

Hundreds of Claude Code plugins with embedded AI skills. Learn via interactive Jupyter tutorials.

⭐ 1,042🍴 135📅 Jan 23, 2026
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SKILL.md

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:

# Verify keys in .env.local match Clerk dashboard
# Publishable key starts with pk_test_ or pk_live_
# Secret key starts with sk_test_ or sk_live_

# Check for trailing whitespace
cat -A .env.local | grep CLERK

# Ensure correct environment
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:

// Ensure ClerkProvider wraps entire app in layout.tsx
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Cause: User session expired or was revoked.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:

// Handle gracefully in your app
const { userId } = await auth()
if (!userId) {
  redirect('/sign-in')
}

Form Identifier Not Found

Error: form_identifier_not_found

Cause: Email/username not registered. Solution:

// Show helpful message to user
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:

// middleware.ts
const isPublicRoute = createRouteMatcher([
  '/sign-in(.*)',  // Must include sign-in pages
  '/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: [
    // Skip static files and _next
    '/((?!_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()

  // Prevent hydration mismatch by waiting for load
  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:

// Server Component - use auth()
import { auth } from '@clerk/nextjs/server'
const { userId } = await auth()

// Client Component - use useAuth()
'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:

// app/api/webhooks/clerk/route.ts
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!
  })

  // Process event
}

Output

  • Identified error category
  • Root cause analysis
  • Working solution code

Diagnostic Commands

# Check Clerk version
npm list @clerk/nextjs

# Verify environment variables
npx next info

# Check for multiple Clerk instances
npm list | grep clerk

# Clear Next.js cache
rm -rf .next && npm run dev

Quick Reference Table

Error CodeMeaningQuick Fix
form_identifier_not_foundUser doesn't existShow sign-up link
form_password_incorrectWrong passwordShow reset link
session_existsAlready logged inRedirect to app
verification_expiredCode expiredResend code
rate_limit_exceededToo many attemptsWait and retry

Resources

Next Steps

Proceed to clerk-debug-bundle for comprehensive debugging tools.

Score

Total Score

85/100

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