{"id":"414ce2a3-fb87-49b0-9faf-e6c9d42a0f97","shortId":"3USDx5","kind":"skill","title":"clerk-auth","tagline":"Expert patterns for Clerk auth implementation, middleware,","description":"# Clerk Authentication\n\nExpert patterns for Clerk auth implementation, middleware, organizations, webhooks, and user sync\n\n## Patterns\n\n### Next.js App Router Setup\n\nComplete Clerk setup for Next.js 14/15 App Router.\n\nIncludes ClerkProvider, environment variables, and basic\nsign-in/sign-up components.\n\nKey components:\n- ClerkProvider: Wraps app for auth context\n- , : Pre-built auth forms\n- : User menu with session management\n\n### Code_example\n\n# Environment variables (.env.local)\nNEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=pk_test_...\nCLERK_SECRET_KEY=sk_test_...\nNEXT_PUBLIC_CLERK_SIGN_IN_URL=/sign-in\nNEXT_PUBLIC_CLERK_SIGN_UP_URL=/sign-up\nNEXT_PUBLIC_CLERK_AFTER_SIGN_IN_URL=/dashboard\nNEXT_PUBLIC_CLERK_AFTER_SIGN_UP_URL=/onboarding\n\n// app/layout.tsx\nimport { ClerkProvider } from '@clerk/nextjs';\n\nexport default function RootLayout({\n children,\n}: {\n children: React.ReactNode;\n}) {\n return (\n \n \n {children}\n \n \n );\n}\n\n// app/sign-in/[[...sign-in]]/page.tsx\nimport { SignIn } from '@clerk/nextjs';\n\nexport default function SignInPage() {\n return (\n
\n \n
\n );\n}\n\n// app/sign-up/[[...sign-up]]/page.tsx\nimport { SignUp } from '@clerk/nextjs';\n\nexport default function SignUpPage() {\n return (\n
\n \n
\n );\n}\n\n// components/Header.tsx\nimport { SignedIn, SignedOut, SignInButton, UserButton } from '@clerk/nextjs';\n\nexport function Header() {\n return (\n
\n

My App

\n \n \n \n \n \n \n
\n );\n}\n\n### Anti_patterns\n\n- Pattern: ClerkProvider inside page component | Why: Provider must wrap entire app in root layout | Fix: Move ClerkProvider to app/layout.tsx\n- Pattern: Using auth() without middleware | Why: auth() requires clerkMiddleware to be configured | Fix: Set up middleware.ts with clerkMiddleware\n\n### References\n\n- https://clerk.com/docs/nextjs/getting-started/quickstart\n\n### Middleware Route Protection\n\nProtect routes using clerkMiddleware and createRouteMatcher.\n\nBest practices:\n- Single middleware.ts file at project root\n- Use createRouteMatcher for route groups\n- auth.protect() for explicit protection\n- Centralize all auth logic in middleware\n\n### Code_example\n\n// middleware.ts\nimport { clerkMiddleware, createRouteMatcher } from '@clerk/nextjs/server';\n\n// Define protected route patterns\nconst isProtectedRoute = createRouteMatcher([\n '/dashboard(.*)',\n '/settings(.*)',\n '/api/private(.*)',\n]);\n\n// Define public routes (optional, for clarity)\nconst isPublicRoute = createRouteMatcher([\n '/',\n '/sign-in(.*)',\n '/sign-up(.*)',\n '/api/webhooks(.*)',\n]);\n\nexport default clerkMiddleware(async (auth, req) => {\n // Protect matched routes\n if (isProtectedRoute(req)) {\n await auth.protect();\n }\n});\n\nexport const config = {\n matcher: [\n // Match all routes except static files\n '/((?!_next|[^?]*\\\\.(?:html?|css|js(?!on)|jpe?g|webp|png|gif|svg|ttf|woff2?|ico|csv|docx?|xlsx?|zip|webmanifest)).*)',\n // Always run for API routes\n '/(api|trpc)(.*)',\n ],\n};\n\n// Advanced: Role-based protection\nexport default clerkMiddleware(async (auth, req) => {\n if (isProtectedRoute(req)) {\n await auth.protect();\n }\n\n // Admin routes require admin role\n if (req.nextUrl.pathname.startsWith('/admin')) {\n await auth.protect({\n role: 'org:admin',\n });\n }\n\n // Premium routes require premium permission\n if (req.nextUrl.pathname.startsWith('/premium')) {\n await auth.protect({\n permission: 'org:premium:access',\n });\n }\n});\n\n### Anti_patterns\n\n- Pattern: Multiple middleware.ts files | Why: Causes conflicts and redirect loops | Fix: Use single middleware.ts with route matchers\n- Pattern: Manual redirects in components | Why: Double redirects, missed routes | Fix: Handle all redirects in middleware\n- Pattern: Missing matcher config | Why: Middleware won't run on all routes | Fix: Add comprehensive matcher pattern\n\n### References\n\n- https://clerk.com/docs/reference/nextjs/clerk-middleware\n\n### Server Component Authentication\n\nAccess auth state in Server Components using auth() and currentUser().\n\nKey functions:\n- auth(): Returns userId, sessionId, orgId, claims\n- currentUser(): Returns full User object\n- Both require clerkMiddleware to be configured\n\n### Code_example\n\n// app/dashboard/page.tsx (Server Component)\nimport { auth, currentUser } from '@clerk/nextjs/server';\nimport { redirect } from 'next/navigation';\n\nexport default async function DashboardPage() {\n const { userId } = await auth();\n\n if (!userId) {\n redirect('/sign-in');\n }\n\n // Full user data (counts toward rate limits)\n const user = await currentUser();\n\n return (\n
\n

Welcome, {user?.firstName}!

\n

Email: {user?.emailAddresses[0]?.emailAddress}

\n
\n );\n}\n\n// Using auth() for quick checks\nexport default async function ProtectedLayout({\n children,\n}: {\n children: React.ReactNode;\n}) {\n const { userId, orgId, orgRole } = await auth();\n\n if (!userId) {\n redirect('/sign-in');\n }\n\n // Check organization access\n if (!orgId) {\n redirect('/select-org');\n }\n\n return (\n
\n

Organization Role: {orgRole}

\n {children}\n
\n );\n}\n\n// Server Action with auth check\n// app/actions/posts.ts\n'use server';\nimport { auth } from '@clerk/nextjs/server';\n\nexport async function createPost(formData: FormData) {\n const { userId } = await auth();\n\n if (!userId) {\n throw new Error('Unauthorized');\n }\n\n const title = formData.get('title') as string;\n\n // Create post with userId\n const post = await prisma.post.create({\n data: {\n title,\n authorId: userId,\n },\n });\n\n return post;\n}\n\n### Anti_patterns\n\n- Pattern: Not awaiting auth() | Why: auth() is async in App Router | Fix: Use await auth() or const { userId } = await auth()\n- Pattern: Using currentUser() for simple checks | Why: Counts toward rate limits, slower than auth() | Fix: Use auth() for userId checks, currentUser() for user data\n\n### References\n\n- https://clerk.com/docs/references/nextjs/auth\n\n### Client Component Hooks\n\nAccess auth state in Client Components using hooks.\n\nKey hooks:\n- useUser(): User object and loading state\n- useAuth(): Auth state, signOut, etc.\n- useSession(): Session object\n- useOrganization(): Current organization\n\n### Code_example\n\n// components/UserProfile.tsx\n'use client';\nimport { useUser, useAuth } from '@clerk/nextjs';\n\nexport function UserProfile() {\n const { user, isLoaded, isSignedIn } = useUser();\n const { signOut } = useAuth();\n\n if (!isLoaded) {\n return
Loading...
;\n }\n\n if (!isSignedIn) {\n return
Not signed in
;\n }\n\n return (\n
\n {user.fullName\n

{user.fullName}

\n

{user.emailAddresses[0]?.emailAddress}

\n \n
\n );\n}\n\n// Organization context\n'use client';\nimport { useOrganization, useOrganizationList } from '@clerk/nextjs';\n\nexport function OrgSwitcher() {\n const { organization, membership } = useOrganization();\n const { setActive, userMemberships } = useOrganizationList({\n userMemberships: { infinite: true },\n });\n\n if (!organization) {\n return

No organization selected

;\n }\n\n return (\n
\n

Current: {organization.name}

\n

Role: {membership?.role}

\n\n setActive?.({ organization: e.target.value })}\n value={organization.id}\n >\n {userMemberships.data?.map((mem) => (\n \n ))}\n \n
\n );\n}\n\n// Protected client component\n'use client';\nimport { useAuth } from '@clerk/nextjs';\nimport { useRouter } from 'next/navigation';\nimport { useEffect } from 'react';\n\nexport function ProtectedContent() {\n const { isLoaded, userId } = useAuth();\n const router = useRouter();\n\n useEffect(() => {\n if (isLoaded && !userId) {\n router.push('/sign-in');\n }\n }, [isLoaded, userId, router]);\n\n if (!isLoaded || !userId) {\n return
Loading...
;\n }\n\n return
Protected content here
;\n}\n\n### Anti_patterns\n\n- Pattern: Not checking isLoaded | Why: Auth state undefined during hydration | Fix: Always check isLoaded before accessing user/auth state\n- Pattern: Using hooks in Server Components | Why: Hooks only work in Client Components | Fix: Use auth() and currentUser() in Server Components\n\n### References\n\n- https://clerk.com/docs/references/react/use-user\n\n### Organizations and Multi-Tenancy\n\nImplement B2B multi-tenancy with Clerk Organizations.\n\nFeatures:\n- Multiple orgs per user\n- Roles and permissions\n- Organization-scoped data\n- Enterprise SSO per organization\n\n### Code_example\n\n// Organization creation UI\n// app/create-org/page.tsx\nimport { CreateOrganization } from '@clerk/nextjs';\n\nexport default function CreateOrgPage() {\n return (\n
\n \n
\n );\n}\n\n// Organization profile and management\n// app/org-settings/page.tsx\nimport { OrganizationProfile } from '@clerk/nextjs';\n\nexport default function OrgSettingsPage() {\n return ;\n}\n\n// Organization switcher in header\n// components/Header.tsx\nimport { OrganizationSwitcher, UserButton } from '@clerk/nextjs';\n\nexport function Header() {\n return (\n
\n \n \n
\n );\n}\n\n// Org-scoped data access\n// app/dashboard/page.tsx\nimport { auth } from '@clerk/nextjs/server';\nimport { prisma } from '@/lib/prisma';\n\nexport default async function DashboardPage() {\n const { orgId } = await auth();\n\n if (!orgId) {\n redirect('/select-org');\n }\n\n // Fetch org-scoped data\n const projects = await prisma.project.findMany({\n where: { organizationId: orgId },\n });\n\n return (\n
\n

Projects

\n {projects.map((p) => (\n
{p.name}
\n ))}\n
\n );\n}\n\n// Role-based UI\n'use client';\nimport { useOrganization, Protect } from '@clerk/nextjs';\n\nexport function AdminPanel() {\n const { membership } = useOrganization();\n\n // Using Protect component\n return (\n Admin access required

}>\n
Admin content here
\n \n );\n\n // Or manual check\n if (membership?.role !== 'org:admin') {\n return

Admin access required

;\n }\n\n return
Admin content here
;\n}\n\n### Anti_patterns\n\n- Pattern: Not scoping data by orgId | Why: Data leaks between organizations | Fix: Always filter queries by orgId from auth()\n- Pattern: Hardcoding role strings | Why: Typos cause access issues | Fix: Define role constants or use TypeScript enums\n\n### References\n\n- https://clerk.com/docs/guides/organizations\n- https://clerk.com/articles/multi-tenancy-in-react-applications-guide\n\n### Webhook User Sync\n\nSync Clerk users to your database using webhooks.\n\nKey webhooks:\n- user.created: New user signed up\n- user.updated: User profile changed\n- user.deleted: User deleted account\n\nUses svix for signature verification.\n\n### Code_example\n\n// app/api/webhooks/clerk/route.ts\nimport { Webhook } from 'svix';\nimport { headers } from 'next/headers';\nimport { WebhookEvent } from '@clerk/nextjs/server';\nimport { prisma } from '@/lib/prisma';\n\nexport async function POST(req: Request) {\n const WEBHOOK_SECRET = process.env.CLERK_WEBHOOK_SECRET;\n\n if (!WEBHOOK_SECRET) {\n throw new Error('Missing CLERK_WEBHOOK_SECRET');\n }\n\n // Get headers\n const headerPayload = await headers();\n const svix_id = headerPayload.get('svix-id');\n const svix_timestamp = headerPayload.get('svix-timestamp');\n const svix_signature = headerPayload.get('svix-signature');\n\n if (!svix_id || !svix_timestamp || !svix_signature) {\n return new Response('Missing svix headers', { status: 400 });\n }\n\n // Get body\n const payload = await req.json();\n const body = JSON.stringify(payload);\n\n // Verify webhook\n const wh = new Webhook(WEBHOOK_SECRET);\n let evt: WebhookEvent;\n\n try {\n evt = wh.verify(body, {\n 'svix-id': svix_id,\n 'svix-timestamp': svix_timestamp,\n 'svix-signature': svix_signature,\n }) as WebhookEvent;\n } catch (err) {\n console.error('Webhook verification failed:', err);\n return new Response('Verification failed', { status: 400 });\n }\n\n // Handle events\n const eventType = evt.type;\n\n if (eventType === 'user.created') {\n const { id, email_addresses, first_name, last_name, image_url } = evt.data;\n\n await prisma.user.create({\n data: {\n clerkId: id,\n email: email_addresses[0]?.email_address,\n firstName: first_name,\n lastName: last_name,\n imageUrl: image_url,\n },\n });\n }\n\n if (eventType === 'user.updated') {\n const { id, email_addresses, first_name, last_name, image_url } = evt.data;\n\n await prisma.user.update({\n where: { clerkId: id },\n data: {\n email: email_addresses[0]?.email_address,\n firstName: first_name,\n lastName: last_name,\n imageUrl: image_url,\n },\n });\n }\n\n if (eventType === 'user.deleted') {\n const { id } = evt.data;\n\n await prisma.user.delete({\n where: { clerkId: id! },\n });\n }\n\n return new Response('Webhook processed', { status: 200 });\n}\n\n// Prisma schema\n// prisma/schema.prisma\nmodel User {\n id String @id @default(cuid())\n clerkId String @unique\n email String @unique\n firstName String?\n lastName String?\n imageUrl String?\n createdAt DateTime @default(now())\n updatedAt DateTime @updatedAt\n\n posts Post[]\n @@index([clerkId])\n}\n\n### Anti_patterns\n\n- Pattern: Not verifying webhook signature | Why: Anyone can hit your endpoint with fake data | Fix: Always verify with svix\n- Pattern: Blocking middleware for webhook routes | Why: Webhooks come from Clerk, not authenticated users | Fix: Add /api/webhooks(.*)' to public routes\n- Pattern: Not handling race conditions | Why: user.created might arrive after user.updated | Fix: Use upsert instead of create, handle missing records\n\n### References\n\n- https://clerk.com/docs/webhooks/sync-data\n- https://clerk.com/articles/how-to-sync-clerk-user-data-to-your-database\n\n### API Route Protection\n\nProtect API routes using auth() from Clerk.\n\nRoute Handlers in App Router use auth() for authentication.\nMiddleware provides initial protection, auth() provides in-handler verification.\n\n### Code_example\n\n// app/api/projects/route.ts\nimport { auth } from '@clerk/nextjs/server';\nimport { prisma } from '@/lib/prisma';\nimport { NextResponse } from 'next/server';\n\nexport async function GET() {\n const { userId, orgId } = await auth();\n\n if (!userId) {\n return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });\n }\n\n // User's personal projects or org projects\n const projects = await prisma.project.findMany({\n where: orgId\n ? { organizationId: orgId }\n : { userId, organizationId: null },\n });\n\n return NextResponse.json(projects);\n}\n\nexport async function POST(req: Request) {\n const { userId, orgId } = await auth();\n\n if (!userId) {\n return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });\n }\n\n const body = await req.json();\n\n const project = await prisma.project.create({\n data: {\n name: body.name,\n userId,\n organizationId: orgId ?? null,\n },\n });\n\n return NextResponse.json(project, { status: 201 });\n}\n\n// Protected with role check\n// app/api/admin/users/route.ts\nexport async function GET() {\n const { userId, orgRole } = await auth();\n\n if (!userId) {\n return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });\n }\n\n if (orgRole !== 'org:admin') {\n return NextResponse.json({ error: 'Forbidden' }, { status: 403 });\n }\n\n // Admin-only logic\n const users = await prisma.user.findMany();\n return NextResponse.json(users);\n}\n\n// Using getAuth in older patterns (not recommended)\n// For backwards compatibility only\nimport { getAuth } from '@clerk/nextjs/server';\n\nexport async function GET(req: Request) {\n const { userId } = getAuth(req);\n // ...\n}\n\n### Anti_patterns\n\n- Pattern: Trusting middleware alone | Why: Middleware can be bypassed (CVE-2025-29927) | Fix: Always verify auth in route handler too\n- Pattern: Not checking orgId for multi-tenant | Why: Users might access other org's data | Fix: Always filter by orgId from auth()\n\n### References\n\n- https://clerk.com/docs/guides/protecting-pages\n\n## Sharp Edges\n\n### CVE-2025-29927 Middleware Bypass Vulnerability\n\nSeverity: CRITICAL\n\n### Multiple Middleware Files Cause Conflicts\n\nSeverity: HIGH\n\n### 4KB Session Token Cookie Limit\n\nSeverity: HIGH\n\n### auth() Requires clerkMiddleware Configuration\n\nSeverity: HIGH\n\n### Webhook Race Conditions\n\nSeverity: MEDIUM\n\n### auth() is Async in App Router\n\nSeverity: MEDIUM\n\n### Middleware Blocks Webhook Endpoints\n\nSeverity: MEDIUM\n\n### Accessing Auth State Before isLoaded\n\nSeverity: MEDIUM\n\n### Manual Redirects Cause Double Redirects\n\nSeverity: MEDIUM\n\n### Organization Data Not Scoped by orgId\n\nSeverity: HIGH\n\n## Validation Checks\n\n### Clerk Secret Key in Client Code\n\nSeverity: ERROR\n\nCLERK_SECRET_KEY must only be used server-side\n\nMessage: Clerk secret key exposed to client. Use CLERK_SECRET_KEY without NEXT_PUBLIC prefix.\n\n### Protected Route Without Middleware\n\nSeverity: ERROR\n\nAPI routes should have middleware protection\n\nMessage: API route without auth check. Add middleware protection or auth() check.\n\n### Hardcoded Clerk API Keys\n\nSeverity: ERROR\n\nClerk keys should use environment variables\n\nMessage: Hardcoded Clerk keys. Use environment variables.\n\n### Missing Await on auth()\n\nSeverity: ERROR\n\nauth() is async in App Router and must be awaited\n\nMessage: auth() not awaited. Use 'await auth()' in App Router.\n\n### Multiple Middleware Files\n\nSeverity: WARNING\n\nOnly one middleware.ts file should exist\n\nMessage: Multiple middleware files detected. Use single middleware.ts.\n\n### Webhook Route Not Excluded from Protection\n\nSeverity: WARNING\n\nWebhook routes should be public\n\nMessage: Webhook route may be blocked by middleware. Add to public routes.\n\n### Accessing Auth Without isLoaded Check\n\nSeverity: WARNING\n\nCheck isLoaded before accessing user state in client components\n\nMessage: Accessing user without isLoaded check. Check isLoaded first.\n\n### Clerk Hooks in Server Component\n\nSeverity: ERROR\n\nClerk hooks only work in Client Components\n\nMessage: Clerk hooks in Server Component. Add 'use client' or use auth().\n\n### Multi-Tenant Query Without orgId\n\nSeverity: WARNING\n\nOrganization data should be scoped by orgId\n\nMessage: Query without organization scope. Filter by orgId for multi-tenancy.\n\n### Webhook Without Signature Verification\n\nSeverity: ERROR\n\nClerk webhooks must verify svix signature\n\nMessage: Webhook without signature verification. Use svix to verify.\n\n## Collaboration\n\n### Delegation Triggers\n\n- user needs database -> postgres-wizard (User table with clerkId)\n- user needs payments -> stripe-integration (Customer linked to Clerk user)\n- user needs search -> algolia-search (Secured API keys per user)\n- user needs analytics -> segment-cdp (User identification)\n- user needs email -> resend-email (Transactional emails)\n\n## When to Use\n- User mentions or implies: adding authentication\n- User mentions or implies: clerk auth\n- User mentions or implies: user authentication\n- User mentions or implies: sign in\n- User mentions or implies: sign up\n- User mentions or implies: user management\n- User mentions or implies: multi-tenancy\n- User mentions or implies: organizations\n- User mentions or implies: sso\n- User mentions or implies: single sign-on\n\n## Limitations\n- Use this skill only when the task clearly matches the scope described above.\n- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.\n- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.","tags":["clerk","auth","antigravity","awesome","skills","sickn33","agent-skills","agentic-skills","ai-agent-skills","ai-agents","ai-coding","ai-workflows"],"capabilities":["skill","source-sickn33","skill-clerk-auth","topic-agent-skills","topic-agentic-skills","topic-ai-agent-skills","topic-ai-agents","topic-ai-coding","topic-ai-workflows","topic-antigravity","topic-antigravity-skills","topic-claude-code","topic-claude-code-skills","topic-codex-cli","topic-codex-skills"],"categories":["antigravity-awesome-skills"],"synonyms":[],"warnings":[],"endpointUrl":"https://skills.sh/sickn33/antigravity-awesome-skills/clerk-auth","protocol":"skill","transport":"skills-sh","auth":{"type":"none","details":{"cli":"npx skills add sickn33/antigravity-awesome-skills","source_repo":"https://github.com/sickn33/antigravity-awesome-skills","install_from":"skills.sh"}},"qualityScore":"0.700","qualityRationale":"deterministic score 0.70 from registry signals: · indexed on github topic:agent-skills · 34882 github stars · SKILL.md body (20,643 chars)","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"deterministic:skill-github:v1","enrichmentVersion":1,"enrichedAt":"2026-04-24T12:50:46.648Z","embedding":null,"createdAt":"2026-04-18T21:34:27.298Z","updatedAt":"2026-04-24T12:50:46.648Z","lastSeenAt":"2026-04-24T12:50:46.648Z","tsv":"'-2025':1630,1670 '-29927':1631,1671 '/admin':348 '/api/private':262 '/api/webhooks':274,1398 '/articles/how-to-sync-clerk-user-data-to-your-database':1428 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