> For the complete documentation index, see [llms.txt](https://docs.launchstack.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.launchstack.app/backend.md).

# Backend

- [Introduction](https://docs.launchstack.app/backend/introduction.md)
- [Application Structure](https://docs.launchstack.app/backend/application-structure.md)
- [Config](https://docs.launchstack.app/backend/config.md)
- [API](https://docs.launchstack.app/backend/api.md)
- [Authentication](https://docs.launchstack.app/backend/authentication.md)
- [Email and Password](https://docs.launchstack.app/backend/authentication/email-and-password.md)
- [Social Login](https://docs.launchstack.app/backend/authentication/social-login.md)
- [Debugging](https://docs.launchstack.app/backend/debugging.md)
- [Environment Variables](https://docs.launchstack.app/backend/environment-variables.md)
- [File Uploads](https://docs.launchstack.app/backend/file-uploads.md)
- [Logging](https://docs.launchstack.app/backend/logging.md)
- [Mail](https://docs.launchstack.app/backend/mail.md)
- [Handling Errors \[Sentry\]](https://docs.launchstack.app/backend/handling-errors-sentry.md)
- [Notifications](https://docs.launchstack.app/backend/notifications.md)
- [Email Notifications](https://docs.launchstack.app/backend/notifications/email-notifications.md)
- [In-App Notifications](https://docs.launchstack.app/backend/notifications/in-app-notifications.md)
- [Payments \[Stripe\]](https://docs.launchstack.app/backend/payments-stripe.md)
- [Payments \[Paddle\]](https://docs.launchstack.app/backend/payments-paddle.md)
- [Routing](https://docs.launchstack.app/backend/routing.md)
- [Testing](https://docs.launchstack.app/backend/testing.md)
- [Feature Tests](https://docs.launchstack.app/backend/testing/feature-tests.md)
- [Browser Tests](https://docs.launchstack.app/backend/testing/browser-tests.md)