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JavaScriptIntermediate#browser#async
JavaScriptBeginner#browser#storage
What are localStorage, sessionStorage and cookies?
localStorage persists until cleared, sessionStorage clears when the tab closes; both hold about 5 MB of strings and are never sent to the server. Cookies are small, can expire and are attached to every matching request.
Example
localStorage.setItem('theme', 'dark');
JSON.parse(localStorage.getItem('user') ?? 'null');
sessionStorage.setItem('step', '2');