Put simply, Replit Auth is a way to verify who users are and control what they can access in your application. Instead of building complex authentication systems from scratch, Replit Auth provides a secure, ready-to-use solution integrated with Replit’s infrastructure.

​
Why use Replit Auth

Authentication is a challenging problem that entire companies dedicate themselves to solving. Your app’s primary purpose likely isn’t authentication - it’s whatever unique idea or solution you’re building.

Replit Auth offers:

  • Zero setup - Add authentication with a single prompt in Agent
  • Built-in security - Uses Replit’s infrastructure with protections against common attacks
  • User management - Simplified user administration through the Auth pane
  • Database integration - Automatic user entries in your database
  • Customizable login page - Personalize the login experience for your app
  • Password reset - Replit sends password reset emails for you, so you don’t must set up your own email delivery provider.

​
Getting started with Replit Auth

The only way to implement Replit Auth is by using Agent. Simply include a request for Replit Auth in your prompt:

Help me create an app that [your app idea] and should feature Replit Auth.

Agent will set up all the necessary code and configurations for authentication. Manual implementation is not supported, as Agent handles all the complexity for you.

To learn more about Agent capabilities, see the Replit Agent documentation and Agent integrations.

For tips on writing effective prompts, check out Effective prompting with Replit.

​
Managing users

Replit Auth provides a built-in user management interface accessible through the Auth pane in your Replit workspace.

From this interface, you can:

  • View all authenticated users
  • Ban users from your application
  • View user details
  • Track user activity

​
Customizing the login page

You can customize the login page to match your app’s branding:

  1. Navigate to the Auth pane in your Replit workspace
  2. Click on Configure
  3. Customize the following elements:
    • App name
    • App icon
    • Login methods (Google, GitHub, X, Apple, Email)

Your changes will immediately appear on your app’s login page.

​
Connecting user data with your database

Replit Auth automatically creates user entries in your database. This makes it easy to store user-specific data. Agent will guide you on properly connecting user data with your database.

For more information on databases, see the Replit Database Documentation.

​
Security considerations

Replit Auth leverages Replit’s infrastructure, providing built-in protections against common security threats. However, you should still follow these best practices:

  • Always validate user authentication server-side before performing sensitive operations
  • Never store sensitive information like passwords in your code
  • Use environment variables for any API keys or secrets
  • Implement proper access controls for user data

For more information on security, check out:

​
Referrals

To encourage applications that teach people about Replit, any user that signs up via Replit Auth will automatically be added to your pending Replit Referrals. If they later upgrade to Replit Core, you will receive any referral bonus you are entitled to according to the current terms of the referral program.

​
Troubleshooting

​
Common issues

  1. User not recognized after login

    • If you’re experiencing issues, ask Replit Assistant for help debugging your authentication implementation.

  2. Custom icon not displaying

    • Make sure the icon URL is accessible and in a supported format (PNG or JPG).

​
Additional resources