building-streamlit-multipage-apps

To build a multi-page Streamlit app, create an app_pages directory, initialize shared session_state in the main module, define navigation entries with titles and icons, and call page.run to render the selected page. This structure ensures consistent navigation and state management across pages.

Session state works across multiple Streamlit pages by initializing global state in the main module and using prefixed keys for page-specific state to prevent collisions. This approach allows pages to share data like API clients and user sessions while maintaining isolated page states.

Yes, you can conditionally include or hide pages in Streamlit based on authentication, roles, feature flags, or environment conditions. This allows you to dynamically show admin pages only to privileged users while maintaining a consistent navigation structure for others.

The best way to structure a Streamlit multipage app is to use a dedicated app_pages directory with root-level imports for page modules. This prevents relative import issues and ensures that shared resources and session state are properly accessible across all pages.

A Streamlit multi-page app loses session state when global state is not initialized in the main module or when page-specific keys collide. Initialize shared session_state centrally and use prefixed keys for page-specific data to maintain consistent state across navigation.

Yes, Streamlit apps with grouped navigation sections require an app_pages directory structure. You define navigation in the main module using app_pages entries with titles and icons, allowing you to configure top or sidebar navigation with grouped sections or ungrouped pages for clear user flows.