clerk-migration-deep-dive

# Clerk Migration Deep Dive ## Current State !`npm list @auth0/nextjs-auth0 next-auth @supabase/auth-helpers-nextjs firebase 2>/dev/null | grep -E "auth0|next-auth|supabase|firebase" || echo 'No auth providers detected'` ## Overview Comprehensive guide to migrating from Auth0, Firebase Auth, Supabase Auth, or NextAuth to Clerk. Covers user data export, bulk import, parallel running, and phased migration. ## Prerequisites - Current auth provider access with admin/export permissions - Clerk account with API keys - Git repository with clean working state - Migration timeline planned (recommend 2-4 weeks) ## Instructions ### Step 1: Export Users from Current Provider **Auth0 Export:** ```bash # Export users via Auth0 Management API curl -s -H "Authorization: Bearer $AUTH0_TOKEN" \ "https://$AUTH0_DOMAIN/api/v2/users?per_page=100&page=0" \ | jq '[.[] | {email: .email, name: .name, picture: .picture, created_at: .created_at}]' \ > auth0-users.json ``` **NextAuth (Prisma) Export:** ```typescript // scripts/export-nextauth-users.ts const users = await prisma.user.findMany({ include: { accounts: true }, }) const exported = users.map((u) => ({ email: u.email, name: u.name, image: u.image, provider: u.accounts[0]?.provider, createdAt: u.createdAt, })) await fs.writeFile('nextauth-users.json', JSON.stringify(exported, null, 2)) ``` ### Step 2: Import Users to Clerk ```typescript // scripts/import-to-clerk.ts import { createClerkClient } from '@clerk/backend' imp...