Build a Login Page with Auth Metrics Tracking
Create a real login page with working authentication and instrument it to capture useful investment-app auth metrics such as signups, login attempts, success rate, failures, and drop-off.
The route
9 steps to Done
- 01
Define the auth flow and metrics schema
Establish exactly what the login system must do and what metrics need to be captured before implementation starts.
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Review this project and produce an implementation plan for a real login page with authentication and metrics tracking. Identify the current stack, existing auth provider if any, routing structure, protected pages, and available analytics or database options. Define the auth flow from page load to login success or failure, and list the exact events to track: login_page_view, login_attempt, login_success, login_failure, logout, and unauthorized_redirect. For each event, specify required fields such as timestamp, email or masked identifier when appropriate, failure reason, route, and session or user id if available.
- ✓ Auth provider or backend path is identified
- ✓ Protected destination after login is named
- ✓ Metrics event names are explicitly listed
- ✓ Failure reasons to capture are defined
- ✓ No part of the plan relies on fake UI-only auth
- 02
Create or wire the authentication foundation
Set up the real auth provider, session handling, and shared auth state needed by the login page.
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Set up or connect the project to its actual authentication system. Use the existing auth provider or backend if present; otherwise add the smallest real auth foundation that fits the current stack. Create the necessary auth client, provider or context, session persistence, auth state listener if available, and helper methods for signIn, signOut, and getCurrentUser. Make sure session state survives refresh when the chosen provider supports persistence.
- ✓ There is a real signIn function wired to an auth source
- ✓ There is a real signOut function
- ✓ Session or token persistence is implemented
- ✓ Auth state can be read by pages or route guards
- ✓ No hardcoded success path is used as final behavior
- 03
Build the login page UI with validation
Create a usable login form with proper field validation and submission states.
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Create a login page component using the project's existing UI approach. Include email and password inputs, submit button, inline validation for required fields, email format validation, disabled submit during request, and clear error messages for invalid credentials or network failures. Hook submission to the real signIn function and keep the page accessible with labels and keyboard-friendly interactions.
- ✓ Email and password fields render and accept input
- ✓ Invalid email format is blocked before submission
- ✓ Empty required fields show errors
- ✓ Submit button shows loading or disabled state during request
- ✓ Auth errors are displayed to the user
- 04
Add auth metrics event tracking
Instrument the login experience so each important auth action is recorded and measurable.
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Instrument the auth experience with real event tracking. Add events for login_page_view when the page loads, login_attempt when the user submits, login_success on successful authentication, login_failure on failed authentication, logout when the user signs out, and unauthorized_redirect when a non-authenticated user is sent to login. Each event should include timestamp, route, and relevant metadata such as failure reason, auth provider, and user id when available and safe. If analytics is not already configured, create a minimal event logging solution using a database table, backend endpoint, or persistent store that can be verified after testing.
- ✓ Page view event is triggered on login page load
- ✓ Submit attempt event is triggered before auth result returns
- ✓ Success event is triggered only after real successful auth
- ✓ Failure event includes a reason or error category
- ✓ Events can be verified in storage, logs, or analytics output
- 05
Protect routes and redirect correctly
Ensure authenticated users reach the app and unauthenticated users are blocked from protected content.
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Implement route guards or equivalent access control using the project's router and auth state. Protected pages must check for a valid authenticated session before rendering. Unauthenticated users should be redirected to the login page and trigger an unauthorized_redirect event. Authenticated users who visit the login page can optionally be redirected to the main app dashboard or home area. Make sure the redirect after successful login is wired to actual auth success, not button click alone.
- ✓ Protected pages do not render for logged-out users
- ✓ Unauthorized users are redirected to login
- ✓ Successful login redirects to the intended app page
- ✓ Authenticated users can refresh and stay in the protected area if session exists
- ✓ Unauthorized redirect event is tracked
- 06
Handle failure states and edge cases
Make the login flow reliable under invalid credentials, network issues, and session edge cases.
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Add robust error handling around authentication. Distinguish invalid credentials from network or server errors when possible. Prevent duplicate submissions while a request is in progress. Handle expired or missing sessions gracefully. Ensure logout clears local auth state and sends a logout event. If the auth provider returns structured error codes, map them to user-friendly messages and analytics-friendly failure categories.
- ✓ Invalid credentials show a specific error
- ✓ Network or server failure shows a separate error path
- ✓ Repeated rapid clicks do not send duplicate auth requests
- ✓ Logout clears auth state properly
- ✓ Failure metrics contain useful categories
- 07
Create a simple metrics verification view
Provide a way to confirm that auth events are actually being captured.
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Build a minimal metrics verification surface for development or admin use. It should display recent auth events such as login_page_view, login_attempt, login_success, login_failure, logout, and unauthorized_redirect, including timestamps and key metadata. Use the actual event store or analytics source configured earlier. Keep it simple but real so I can test the login flow and immediately confirm the tracked records.
- ✓ Recent auth events are visible in one place
- ✓ Event names match the planned schema
- ✓ Timestamps are present
- ✓ Success and failure events can be distinguished
- ✓ The view reads from real stored or delivered data
- 08
Run end-to-end auth and metrics tests
Verify that the full login flow works in practice and that each action produces the expected metric.
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Run a practical end-to-end verification of the login system. Test login page load, invalid email validation, empty field validation, failed login with invalid credentials, successful login with valid credentials, refresh while authenticated, access to a protected route while logged out, and logout. For each scenario, confirm both user-visible behavior and the corresponding tracked event or stored metric record. Report any failing cases and fix them.
- ✓ Successful login works with real credentials
- ✓ Failed login is blocked and tracked
- ✓ Protected route blocks logged-out users
- ✓ Session persists correctly after refresh if supported
- ✓ Logout works and is tracked
- 09
Fix implementation gaps and harden the final flow
Close the common gaps left by AI-generated builds and ensure the feature is production-ready enough for the intended scope.
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Perform a final implementation audit of the login page, auth integration, route protection, and metrics tracking. Remove placeholders, dead code, duplicated event calls, and inconsistent event names. Verify error handling is correct, redirects are stable, metrics payload fields are populated consistently, and any temporary mock behavior is replaced with real logic. Summarize the final file changes and any setup required for credentials or environment variables.
- ✓ No placeholder auth logic remains in the final path
- ✓ No console-only analytics is being presented as complete tracking
- ✓ Event names and payloads are consistent across the app
- ✓ Protected routes are enforced
- ✓ The final setup is testable immediately