Clerk Upgrade & Migration

Overview

Safely upgrade Clerk SDK versions and handle breaking changes.

Prerequisites

Current Clerk integration working
Git repository with clean working state
Test environment available

Instructions

Step 1: Check Current Version and Available Updates

# Check current version
npm list @clerk/nextjs

# Check for updates
npm outdated @clerk/nextjs

# View changelog
npm view @clerk/nextjs versions --json | tail -20

Step 2: Review Breaking Changes

// Common breaking changes by major version:

// v5 -> v6 Changes:
// - clerkMiddleware() replaces authMiddleware()
// - auth() is now async
// - Removed deprecated hooks
// - New createRouteMatcher() API

// Before (v5)
import { authMiddleware } from '@clerk/nextjs'
export default authMiddleware({
  publicRoutes: ['/']
})

// After (v6)
import { clerkMiddleware, createRouteMatcher } from '@clerk/nextjs/server'
const isPublicRoute = createRouteMatcher(['/'])
export default clerkMiddleware(async (auth, req) => {
  if (!isPublicRoute(req)) await auth.protect()
})

Step 3: Upgrade Process

# 1. Create upgrade branch
git checkout -b upgrade-clerk-sdk

# 2. Update package
npm install @clerk/nextjs@latest

# 3. Check for peer dependency issues
npm ls @clerk/nextjs

# 4. Run type checking
npm run typecheck

# 5. Run tests
npm test

Step 4: Handle Common Migration Patterns

Middleware Migration (v5 to v6)

// OLD: authMiddleware (deprecated)
import { authMiddleware } from '@clerk/nextjs'

export default authMiddleware({
  publicRoutes: ['/', '/sign-in', '/sign-up'],
  ignoredRoutes: ['/api/webhooks(.*)']
})

// NEW: clerkMiddleware
import { clerkMiddleware, createRouteMatcher } from '@clerk/nextjs/server'

const isPublicRoute = createRouteMatcher([
  '/',
  '/sign-in(.*)',
  '/sign-up(.*)'
])

export default clerkMiddleware(async (auth, request) => {
  if (!isPublicRoute(request)) {
    await auth.protect()
  }
})

Async Auth Migration

// OLD: Synchronous auth
import { auth } from '@clerk/nextjs'

export function GET() {
  const { userId } = auth()  // Synchronous
  // ...
}

// NEW: Async auth
import { auth } from '@clerk/nextjs/server'

export async function GET() {
  const { userId } = await auth()  // Async
  // ...
}

Hook Updates

// OLD: useAuth() changes
const { isSignedIn, isLoaded } = useAuth()

// NEW: Check specific deprecations
// useAuth() still works but some properties changed

// OLD: Deprecated organization hooks
import { useOrganization } from '@clerk/nextjs'
const { membership } = useOrganization()

// NEW: Updated API
import { useOrganization } from '@clerk/nextjs'
const { organization, membership } = useOrganization()

Step 5: Update Import Paths

// Server imports (Next.js App Router)
import { auth, currentUser, clerkClient } from '@clerk/nextjs/server'

// Client imports
import { useUser, useAuth, useClerk } from '@clerk/nextjs'

// Component imports
import {
  ClerkProvider,
  SignIn,
  SignUp,
  UserButton,
  SignInButton,
  SignUpButton
} from '@clerk/nextjs'

Step 6: Test Upgrade

// tests/clerk-upgrade.test.ts
import { describe, it, expect } from 'vitest'

describe('Clerk Upgrade Validation', () => {
  it('auth() returns userId for authenticated users', async () => {
    // Mock or integration test
  })

  it('middleware protects routes correctly', async () => {
    // Test protected routes return 401/redirect
  })

  it('webhooks still verify correctly', async () => {
    // Test webhook signature verification
  })
})

Step 7: Rollback Plan

# If upgrade fails, rollback:
git checkout main -- package.json package-lock.json
npm install

# Or restore from specific version
npm install @clerk/nextjs@5.7.1  # Previous version

Version Compatibility Matrix

| @clerk/nextjs | Next.js | Node.js | |--------------|---------|---------| | 6.x | 14.x, 15.x | 18.x, 20.x | | 5.x | 13.x, 14.x | 18.x, 20.x | | 4.x | 12.x, 13.x | 16.x, 18.x |

Migration Checklist

[ ] Backup current package.json
[ ] Review changelog for breaking changes
[ ] Update @clerk/nextjs package
[ ] Update middleware to clerkMiddleware
[ ] Make auth() calls async
[ ] Update deprecated hooks
[ ] Fix import paths
[ ] Run type checking
[ ] Run tests
[ ] Test authentication flows manually
[ ] Deploy to staging
[ ] Monitor for errors
[ ] Deploy to production

Output

Updated Clerk SDK
Migrated breaking changes
All tests passing
Production deployment ready

Error Handling

| Error | Cause | Solution | |-------|-------|----------| | Type errors after upgrade | API changes | Check changelog, update types | | Middleware not executing | Matcher syntax changed | Update matcher regex | | auth() returns Promise | Now async in v6 | Add await to auth() calls | | Import errors | Path changes | Update to @clerk/nextjs/server |

Resources

Next Steps

After upgrade, review clerk-ci-integration for CI/CD updates.