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Copy file name to clipboardExpand all lines: 6-data-storage/02-localstorage/article.md
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@@ -64,6 +64,7 @@ delete localStorage.test;
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That's allowed for historical reasons, and mostly works, but generally not recommended, because:
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1. If the key is user-generated, it can be anything, like `length` or `toString`, or another built-in method of `localStorage`. In that case `getItem/setItem` work fine, while object-like access fails:
The latter works, because `Object.keys` only returns the keys that belong to the object, ignoring the prototype.
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## Strings only
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Please note that both key and value must be strings.
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alert( JSON.stringify(localStorage, null, 2) );
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```
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## sessionStorage
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The `sessionStorage` object is used much less often than `localStorage`.
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## Storage event
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When the data gets updated in `localStorage` or `sessionStorage`, [storage](https://www.w3.org/TR/webstorage/#the-storage-event) event triggers, with properties:
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When the data gets updated in `localStorage` or `sessionStorage`, [storage](https://html.spec.whatwg.org/multipage/webstorage.html#the-storageevent-interface) event triggers, with properties:
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- `key` – the key that was changed (`null` if `.clear()` is called).
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- `oldValue` – the old value (`null` if the key is newly added).
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## Summary
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Web storage objects `localStorage` and `sessionStorage` allow to store key/value in the browser.
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