How to Add Login to a Replit App
Replit Auth (launched May 2025) provides zero-setup authentication with a single Agent prompt. It includes email/password login, user management, database integration, and automatic password reset emails. Just tell the Agent: "Add Replit Auth to my app."
Why this matters
Before Replit Auth launched in May 2025, adding login to a Replit app required integrating an external provider — a multi-day effort for non-technical builders. Now it takes a single prompt and works out of the box with Replit's database.
What's at stake
Without authentication, your Replit app cannot distinguish between users. All data is shared, there is no personalization, and you cannot control who accesses features. For any app beyond a simple tool, login is essential.
Step by step.
Ask the Agent to add Replit Auth
Prompt the Replit Agent: "Add Replit Auth with email and password login to my app. Include signup, login, logout, and password reset. Protect the /dashboard route." The Agent generates everything.
Review the generated auth code
Check that the Agent added proper authentication middleware, user session management, and route protection. Verify that protected routes redirect unauthenticated users to the login page.
Verify database integration
Replit Auth integrates with Replit's PostgreSQL database. Check that a users table was created and that user data is stored correctly. Enable RLS on the users table to prevent unauthorized access.
Test password reset flow
Replit Auth includes automatic password reset emails. Test the flow: click "Forgot Password," enter your email, receive the reset link, and set a new password.
Add SSO if needed (enterprise)
Since October 2025, Replit Auth supports SSO for corporate credentials. If building an internal tool, configure SSO in your organization settings to let employees sign in with their work accounts.
Verify your Replit app authentication works before launch
- Automated auth flow testing for Replit-built apps
- Database security check for user data tables
- Session management verification across routes
Frequently asked questions.
Replit Auth is Replit's built-in authentication system launched in May 2025. It provides email/password login, user management, database integration, and automatic password reset — all configurable through a single Agent prompt with zero manual setup.
Replit Auth focuses on email/password login. For social login providers like Google or GitHub, integrate Supabase Auth or another external provider alongside Replit Auth.
Replit Auth integrates with Replit's own PostgreSQL database. If you prefer Supabase, use Supabase Auth instead. Both work on Replit, but you should pick one auth system, not both.
Replit Auth includes built-in security features and integrates with Replit's security scanning. For production apps, also enable RLS on your database tables and run a security scan before deploying.