Browser Storage Patterns

Overview

Browser storage is for data that must survive beyond a single render or request.

Common questions:

• Should this live in a cookie or in localStorage?
• Should it persist across tabs or only this tab?
• Does the server need to read it?
• Is the data sensitive?
• What happens during SSR when browser APIs do not exist yet?

Choosing the wrong storage mechanism creates security, UX, and correctness problems quickly.

Storage Options