Production applications

Connect a visible user action to stored state

A shared reading list ties these chapters together. Someone saves a URL, reads the list, or edits a title while other requests are in flight. The browser, API, database, and permission boundary must agree about what that action means.

The local HTTP/SQLite starter and the separate seeded browser editor give you real code to inspect. They are deliberately small and have different route contracts. Each lesson says which one it uses and what you still need to build.