Auth0 Migration Guide

Migrate users and authentication flows from existing auth providers to Auth0.

Overview

When to Use This Skill

• •Migrating from another auth provider to Auth0
• •Bulk importing existing users
• •Gradually transitioning active user bases
• •Updating JWT validation in APIs

When NOT to Use

• •Starting fresh with Auth0 - Use auth0-quickstart for new projects without existing users
• •Already using Auth0 - This is for migrating TO Auth0, not between Auth0 tenants
• •Only adding MFA or features - Use feature-specific skills if just adding capabilities

Migration Approaches

• •Bulk Migration: One-time user import (recommended for small/inactive bases)
• •Gradual Migration: Lazy migration over time (recommended for large active bases)
• •Hybrid: Import inactive users, lazy-migrate active users

Step 0: Detect Existing Auth Provider

Check if the project already has authentication:

Search for common auth-related patterns in the codebase:

If existing auth detected, ask:

I detected existing authentication in your project. Are you:

1. •Migrating to Auth0 (replace existing auth)
2. •Adding Auth0 alongside (keep both temporarily)
3. •Starting fresh (remove old auth, new Auth0 setup)

Migration Workflow

Step 1: Export Existing Users

Export users from your current provider. See User Import Guide for detailed instructions:

• •Exporting from Firebase
• •Exporting from AWS Cognito
• •Exporting from Supabase
• •Exporting from Custom Database

Required data per user:

• •Email address
• •Email verified status
• •Password hash (if available)
• •User metadata/profile data
• •Creation timestamp

Step 2: Import Users to Auth0

Import users via Dashboard, CLI, or Management API.

Quick start:

# Via Auth0 CLI
auth0 api post "jobs/users-imports" \
  --data "connection_id=con_ABC123" \
  --data "users=@users.json"

For detailed instructions:

• •User JSON Format
• •Password Hash Algorithms
• •Import Methods
• •Monitoring Import Progress
• •Common Import Errors

Step 3: Migrate Application Code

Update your application code to use Auth0 SDKs.

See Code Migration Patterns for detailed before/after examples:

Frontend:

• •React Migration
• •Next.js Migration
• •Vue.js Migration
• •Angular Migration
• •React Native Migration

Backend:

• •Express.js Migration
• •API JWT Validation

Provider-Specific:

• •Firebase to Auth0
• •Supabase to Auth0
• •Clerk to Auth0

After migrating code, use framework-specific skills:

• •auth0-react for React applications
• •auth0-nextjs for Next.js applications
• •auth0-vue for Vue.js applications
• •auth0-angular for Angular applications
• •auth0-express for Express.js applications
• •auth0-react-native for React Native/Expo applications

Step 4: Update API JWT Validation

If your API validates JWTs, update to validate Auth0 tokens.

Key differences:

• •Algorithm: HS256 (symmetric) → RS256 (asymmetric)
• •Issuer: Custom → https://YOUR_TENANT.auth0.com/
• •JWKS URL: https://YOUR_TENANT.auth0.com/.well-known/jwks.json

See JWT Validation Examples for:

• •Node.js / Express implementation
• •Python / Flask implementation
• •Key differences and migration checklist

Gradual Migration Strategy

For production applications with active users, use a phased approach:

Phase 1: Parallel Auth

Support both Auth0 and legacy provider simultaneously:

// Support both providers during migration
const getUser = async () => {
  // Try Auth0 first
  const auth0User = await getAuth0User();
  if (auth0User) return auth0User;

  // Fall back to legacy provider
  return await getLegacyUser();
};

Phase 2: New Users on Auth0

• •All new signups go to Auth0
• •Existing users continue on legacy provider
• •Migrate users on next login (lazy migration)

Phase 3: Forced Migration

• •Prompt remaining users to "update account"
• •Send password reset emails via Auth0
• •Set deadline for legacy system shutdown

Phase 4: Cleanup

• •Remove legacy auth code
• •Archive user export for compliance
• •Update documentation

Common Migration Issues

Reference Documentation

User Import

Complete guide to exporting and importing users:

• •Exporting from Common Providers
• •User JSON Format
• •Password Hash Algorithms
• •Import Methods
• •Monitoring & Troubleshooting

Code Migration

Before/after examples for all major frameworks:

• •React Patterns
• •Next.js Patterns
• •Express Patterns
• •Vue.js Patterns
• •Angular Patterns
• •React Native Patterns
• •API JWT Validation

Related Skills

Core Integration

• •auth0-quickstart - Initial Auth0 setup after migration

SDK Skills

• •auth0-react - React SPA integration
• •auth0-nextjs - Next.js integration
• •auth0-vue - Vue.js integration
• •auth0-angular - Angular integration
• •auth0-express - Express.js integration
• •auth0-react-native - React Native/Expo integration

References

• •Auth0 User Migration Documentation
• •Bulk User Import
• •Password Hash Algorithms
• •Management API - User Import