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Exercises","html-quiz-practice-exercises",{"data":361},{"id":297,"title":298,"slug":299,"content":362,"course":363,"subcategory":364,"author":365,"reading_time_minutes":12,"cornerstone":52,"schema_type":371,"faq_json":5,"video_url":5,"canonical_url":372,"meta_title":373,"meta_description":374,"og_image":5,"toc_json":375,"code_examples":403,"quiz":5,"exercises":412,"published_at":5,"updated_at":419,"prev":420,"next":421},"\u003Ch2 id=\"html-web-storage-localstorage-sessionstorage\">HTML Web Storage: localStorage & sessionStorage\u003C\u002Fh2>\u003Cp>The Web Storage API gives web pages a simple key-value store in the browser, letting you save small amounts of data on the user's device without needing cookies or a server round-trip. It comes in two flavors: \u003Ccode>localStorage\u003C\u002Fcode> and \u003Ccode>sessionStorage\u003C\u002Fcode>, both accessed through nearly identical JavaScript methods.\u003C\u002Fp>\u003Ch3 id=\"localstorage-vs-sessionstorage\">localStorage vs sessionStorage\u003C\u002Fh3>\u003Cul>\n\u003Cli>\u003Cstrong>localStorage\u003C\u002Fstrong> — data persists indefinitely, even after the browser is closed and reopened, until explicitly cleared.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>sessionStorage\u003C\u002Fstrong> — data lasts only for the current browser tab's session; it's cleared automatically when the tab is closed.\u003C\u002Fli>\n\u003C\u002Ful>\u003Cp>Both are scoped per-origin (protocol + domain + port), meaning one website cannot read another website's stored data.\u003C\u002Fp>\u003Ch3 id=\"core-methods\">Core Methods\u003C\u002Fh3>\u003Cul>\n\u003Cli>\u003Cstrong>setItem(key, value)\u003C\u002Fstrong> — stores a value under a key.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>getItem(key)\u003C\u002Fstrong> — retrieves the stored value, or \u003Ccode>null\u003C\u002Fcode> if it doesn't exist.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>removeItem(key)\u003C\u002Fstrong> — deletes a single key.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>clear()\u003C\u002Fstrong> — removes everything stored for that origin.\u003C\u002Fli>\n\u003C\u002Ful>\u003Ch3 id=\"storing-objects-and-arrays\">Storing Objects and Arrays\u003C\u002Fh3>\u003Cp>Web Storage can only store strings. To save an object or array, convert it with \u003Ccode>JSON.stringify()\u003C\u002Fcode> before storing, and parse it back with \u003Ccode>JSON.parse()\u003C\u002Fcode> when reading it.\u003C\u002Fp>\u003Ch3 id=\"listening-for-storage-changes\">Listening for Storage Changes\u003C\u002Fh3>\u003Cp>The \u003Ccode>storage\u003C\u002Fcode> event fires on other open tabs (of the same origin) whenever \u003Ccode>localStorage\u003C\u002Fcode> changes, which is useful for syncing state across multiple open tabs of the same app in real time.\u003C\u002Fp>\u003Ch3 id=\"limitations\">Limitations\u003C\u002Fh3>\u003Cp>Most browsers cap Web Storage at around 5–10MB per origin, it's synchronous (which can block the main thread for large amounts of data), and it should never be used to store sensitive information like passwords or tokens, since it's accessible to any script running on the page.\u003C\u002Fp>\u003Ch3 id=\"common-use-cases\">Common Use Cases\u003C\u002Fh3>\u003Cp>Remembering a user's theme preference (dark\u002Flight mode), saving unsaved form drafts, caching API responses, storing a shopping cart, or remembering a \"don't show this again\" dismissal.\u003C\u002Fp>\u003Cdiv class=\"try-it-yourself language-javascript\">\u003Cpre>\u003Ccode>\u002F\u002F Saving and reading a simple string value\nlocalStorage.setItem('theme', 'dark');\nconsole.log(localStorage.getItem('theme')); 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