Sharing State and Routing Between Remotes

Each Module Federation remote is an independently built and deployed application. Its state (React useState, Context, Zustand stores) lives in its own JavaScript module scope. The host and remotes don't automatically share state — you must architect the sharing explicitly.

The simplest state sharing mechanism is the URL: any remote can read URL params, query strings, and hash values without any cross-remote communication. This works well for primary navigation state, filter values, and any state that should be bookmarkable and shareable via link.