Browser Storage

You might say

Keep this draft after refresh, but do not treat it as a database shared by every user.

Browser storage is a local web mechanism for keeping data in a person's current browser.It can remember dark mode, an unsubmitted form draft, or recently viewed projects so a later page load may restore them. It normally belongs only to that browser and device; clearing data, changing browser, or switching device may remove it.

Know first

Frontend

Web StoragelocalStoragesessionStorage

Where a draft lives and what happens on another device

● ● ●Laptop A

Editing draft…

localStorage
draft = "weekend trip"

×Backend databaseNo uploaded copy

●Phone B

No draft here

localStorage = empty

The draft exists inside Laptop A's browser.

What browser storage is suitable for

Local preferences and short-lived work: Theme selection, an unfinished draft, and non-sensitive interface preferences can remain in the browser so a page quickly restores recent work.

Its scope is usually one browser: It does not automatically sync to another device or make the data available to another user. Important information must also account for data clearing, private mode, and capacity limits.

You can say this to an AI Agent

Save the unsubmitted editing draft in browser storage and restore it after refresh; keep submitted content in the database through the API. Do not put secrets or authorization decisions in browser storage. Verify draft recovery after refresh and submitted content from another device.

Learn next

1Database→

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A team needs users to see the same submitted orders on both phone and computer. Where should the data primarily live?

A. In a server-controlled database, read through authenticated APIs; browser storage can only assist the local experienceB. Only in localStorage because it survives a refreshC. Only in page state because the user does not need to leave this page