Identity
Federated Auth & User Management
Let people have their own account.
The idea
Imagine building a fitness application.
You want people to sign in, save their workouts, and return later.
You don't want to build a password system from scratch.
Federated Authentication allows people to sign in using existing identity providers, while User Management helps your application manage their accounts.
Application blip
Fitness Club
Member access
Sign in to continue
Choose how you would sign in to save your workouts and return to your account.
Behind the scenes
- Identity provider
- Authentication
- User account
- Personalized experience
The identity provider verifies the person signing in. Fitness Club then loads the matching user account and its saved workout history. In a real application, account access is validated on the server; this page only simulates the flow.
What could you build?
- Membership applications
- Customer portals
- Team workspaces
- Subscription services
Implementation notes
- Keep identity IDs stable across providers.
- Separate authentication from application roles.
- Store only the profile data your app needs.
Implementing it
With a coding agent
Ask your agent to add sign-in
Copy this prompt, fill in the bracketed details, and paste it into your coding agent. It describes the goal, the sign-in flow, and the guardrails.
Bracketed text marks details only you can fill in. 880 / 6,000 characters.
Strong prompt · 76/100
Traditional SDK / API
Start a sign-in flow
const session = await ultrahost.auth.signIn({
provider: "google",
redirectTo: "/dashboard",
})Key takeaway
Authentication answers: “Who are you?”
Next primitive
Authorization Layer