Build Real Web App Authentication with Sessions and Protected Routes
A step-by-step flow to implement real signup, login, logout, session persistence, password reset, validation, and protected routes with visible UI states and mobile responsiveness.
The route
9 steps to Done
- 01
Set the auth architecture and choose the real persistence layer
Force the AI builder to define and implement a real authentication approach before generating UI.
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Inspect this codebase and implement a real authentication foundation using the existing stack where possible. I need email/password signup, login, logout, session persistence across refresh, protected dashboard routes, duplicate email handling, password reset, loading states, error states, and mobile responsive UI. Do not build placeholder forms. Use a real auth provider or real backend persistence, define where user state lives, define how session restoration works on app load, and wire the routing strategy for protected pages.
- ✓ A real auth provider or backend auth implementation is present
- ✓ There is a defined source of truth for current user and session state
- ✓ The implementation plan covers signup, login, logout, reset, and route protection
- ✓ The solution uses secure password handling rather than storing plaintext passwords
- 02
Create the auth state layer and session restoration
Establish a centralized way to read auth status, loading state, and restore sessions after refresh.
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Implement a centralized auth state layer in this codebase. It must initialize on app load, restore the current session from the real auth provider or backend, expose current user, authenticated flag, loading flag, auth errors where needed, and provide actions for signup, login, logout, and password reset. Make sure the UI can reliably distinguish between initial auth loading, authenticated, and unauthenticated states.
- ✓ Refreshing the page does not immediately log the user out if a real session exists
- ✓ There is a loading state while auth initialization runs
- ✓ Components can access current user and auth status from a shared source
- ✓ Logout clears authenticated state correctly
- 03
Build the signup flow with validation and duplicate email handling
Implement real user registration with strong validation and visible errors.
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Implement the signup flow in this app using the real auth system. The form must include email, password, and confirm password. Add client-side validation for required fields, valid email format, password rules, and matching passwords. On submit, create the real user record, show loading while the request is in progress, display duplicate email and server errors in the UI, and navigate appropriately after success. Make the layout mobile responsive.
- ✓ Submitting valid signup data creates a real user record
- ✓ Mismatched passwords show an inline error before submission
- ✓ Duplicate email attempts show a visible error message
- ✓ The submit button shows loading and prevents repeated submissions
- ✓ The signup page remains usable on mobile
- 04
Build the login and logout flow with real session creation
Ensure users can sign in and out with visible loading and error behavior.
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Implement the login and logout features using the real auth provider or backend. Add a login page with email and password fields, validation, loading state, and clear user-facing errors for invalid credentials or server failures. On success, create the real session and update centralized auth state. Add a logout action in the authenticated area that ends the session and returns the user to a logged-out route.
- ✓ Valid credentials create an authenticated session
- ✓ Invalid credentials display a visible error message
- ✓ Logout removes access to authenticated content immediately
- ✓ Reloading after login preserves the signed-in state
- 05
Protect dashboard routes and redirect logged-out users
Enforce access control in routing so protected pages cannot be opened while logged out.
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Add route protection to this app using the centralized auth state layer. Protect dashboard and authenticated-only routes so logged-out users cannot access them by direct URL entry. While auth is initializing on page load, show an appropriate loading state instead of redirecting too early. If a user is unauthenticated, redirect them to login. If authenticated, render the protected content normally.
- ✓ Typing a protected route URL while logged out redirects to login
- ✓ Typing a protected route URL while logged in shows the protected page
- ✓ There is no flash of protected content before redirect when logged out
- ✓ Protected route logic uses centralized auth state
- 06
Add password reset with a real end-to-end flow
Implement reset request and completion flow instead of a dead-end form.
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Build the password reset flow using the real auth provider or backend. Add a forgot password page where the user enters their email, trigger the real reset process, and show clear loading, success, and error feedback. If the stack supports a reset confirmation page, wire that route too so the user can actually complete the password change. Keep the UI responsive and user-friendly.
- ✓ Forgot password form submits to a real reset endpoint or provider action
- ✓ Loading state appears while the request is in progress
- ✓ Success or failure is shown visibly in the UI
- ✓ If the stack requires a reset callback route, it exists and is wired
- 07
Polish validation, loading, and error states across all auth screens
Make every auth action understandable and safe for users by exposing state clearly in the UI.
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Review signup, login, logout-triggered transitions, and password reset screens. Ensure each flow has client-side validation, visible backend error messaging, loading indicators, disabled submit buttons during requests, and accessible field or form-level error messaging. Remove any console-only errors and make the state handling consistent across desktop and mobile layouts.
- ✓ Every auth form blocks repeated submission while loading
- ✓ Field-level or form-level errors are visible to users
- ✓ No important auth errors appear only in the console
- ✓ Loading and disabled states are consistent across auth flows
- 08
Make auth pages mobile responsive and consistent
Ensure the authentication experience works on small screens without layout or usability issues.
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Refine the auth UI for mobile responsiveness without breaking functionality. Review signup, login, forgot password, and any reset confirmation screens on small widths. Ensure inputs, buttons, labels, error messages, and containers scale correctly, remain readable, avoid horizontal scrolling, and keep clear touch targets. Maintain all real validation, loading, and error behavior.
- ✓ Auth screens fit narrow mobile widths without horizontal scrolling
- ✓ Buttons and inputs remain easy to tap on mobile
- ✓ Error messages do not overlap or break the layout
- ✓ Responsive fixes did not break auth functionality
- 09
Run end-to-end auth testing and fix failures
Verify the implementation actually works in practice and close gaps the AI builder may have missed.
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Run a full auth QA pass on this app. Test: successful signup, duplicate email rejection, invalid signup validation, successful login, failed login, logout, session persistence after refresh, direct URL access to protected routes while logged out, password reset request flow, and mobile responsiveness. Fix any issues found. If the stack supports it, add or update basic automated tests for the core auth paths.
- ✓ Successful signup, login, and logout have been verified
- ✓ Session remains valid after a browser refresh
- ✓ Protected routes are inaccessible while logged out
- ✓ Duplicate email and invalid credential errors are visible in the UI
- ✓ Password reset request flow works
- ✓ Mobile layout has been checked