How should I plan authentication, user accounts, and permissions before vibe coding an app?

Before you start "vibe coding"—where the focus is on momentum and creative flow—you need a solid blueprint for identity and access. If you skip this, you’ll end up refactoring your entire database schema once your app grows.

Here is how to plan your authentication and permissions efficiently:

1. Choose Your Identity Strategy

Don't build your own auth system from scratch. Use established patterns to keep the security burden off your shoulders.

• Managed Auth (e.g., Clerk, Supabase Auth, Firebase Auth): These provide pre-built UI components and handle edge cases like session management, OAuth (Google/GitHub login), and password resets. For rapid development, these are the gold standard.
• The "User" Table: Even if you use a provider, create a users table in your own database that mirrors the user_id from your auth provider. This allows you to store app-specific metadata, like a user's subscription status, display name, or preferences.

2. Design the Permission Model (RBAC vs. ABAC)

Keep it simple to start. You generally have two choices:

• Role-Based Access Control (RBAC): Assign users roles (e.g., admin, editor, viewer). This is usually enough for 90% of apps.
• Attribute-Based Access Control (ABAC): Grant access based on conditions (e.g., "the user owns this specific document"). This is safer for data-heavy apps where users shouldn't see each other's private data.
• Pro-tip: Don't check for roles in your UI—check for permissions. Instead of checking if (user.role === 'admin'), check if (user.canDeletePost). This makes it easier to update roles later without changing your code everywhere.

3. The "Ownership" Pattern

The most common mistake is forgetting that data is often private. When you design your database schema, every table that holds user data should include a user_id or tenant_id foreign key.

• Always include a constraint: Ensure your database query layer automatically filters by the current user's ID. If you are using something like Supabase, you can set this up with Row Level Security (RLS), which enforces data privacy at the database level regardless of what the application code tries to do.

4. Planning the Flow

Before you write code, write down these three lists:

1. Public Routes: (e.g., Landing page, login, pricing).
2. Protected Routes: (e.g., Dashboard, settings, profile).
3. Action Requirements: For every action (like "delete project"), define who is allowed to do it (e.g., "Only the project owner").

5. Start with "Minimum Viable Security"

• User ID Mapping: Use the provider’s ID to identify users.
• Session State: Use a library that handles "protected layouts" (e.g., middleware in Next.js) so that your app automatically redirects unauthenticated users to the login page.
• Avoid Custom Auth: Avoid building your own password hashing or token validation until you are an expert. Stick to well-maintained SDKs.

A final piece of advice for vibe coding: If you choose a framework like Next.js or a platform like Supabase, look up their "Auth Starter" templates. Starting with a boilerplate that already has the "Sign In/Sign Out" and "Protected Route" logic implemented will save you hours of debugging and let you get back to the fun parts of building.