Auth0 handles authentication (login/signup), but your app still needs a database to store app-specific user data. Here’s why:

1. Auth0’s Job vs. Your App’s Job

• Auth0’s Job:
  • Verify user identity (email/password, Google login, etc.).
  • Store basic user info (email, name, Auth0 ID).
  • Send back a secure token (JWT) to confirm the user is real.
• Your App’s Job:

  • Store app-specific data:

    • Order history 🍟
    • Favorite foods 🌮
    • Delivery addresses 🏠
    • Payment methods 💳

  • Example:

    If a user orders a pizza, Auth0 doesn’t care about their toppings choice. Your app needs to save that!

2. Real-Life Scenarios

Scenario 1: User Profile Page

Imagine your app has a profile page where users:

• Save dietary preferences (vegan, gluten-free).
• View past orders.

Problem: Auth0 doesn’t store this data.

Solution: Save it in your database linked to the user’s Auth0 ID.

Scenario 2: Switching Auth Providers

What if Auth0 becomes too expensive, or you want to switch to Firebase?

Problem: All user data is stuck in Auth0’s database.

Solution: Your app’s database has the user’s Auth0 ID and their app data. You can migrate to a new auth provider without losing data.

Scenario 3: Analytics