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----
-title: Storage
-slug: Web/API/Storage
-tags:
- - API
- - Interface
- - NeedsTranslation
- - Reference
- - Storage
- - TopicStub
- - Web Storage
- - data
-translation_of: Web/API/Storage
----
-<p>{{APIRef("Web Storage API")}}</p>
-
-<p>The <code>Storage</code> interface of the Web Storage API provides access to a particular domain's session or local storage. It allows, for example, the addition, modification, or deletion of stored data items.</p>
-
-<p>To manipulate, for instance, the session storage for a domain, a call to the {{domxref("Window.sessionStorage")}} is made; whereas for local storage the call is made to {{domxref("Window.localStorage")}}.</p>
-
-<h2 id="Properties">Properties</h2>
-
-<dl>
- <dt>{{domxref("Storage.length")}} {{readonlyInline}}</dt>
- <dd>Returns an integer representing the number of data items stored in the <code>Storage</code> object.</dd>
-</dl>
-
-<h2 id="Methods">Methods</h2>
-
-<dl>
- <dt>{{domxref("Storage.key()")}}</dt>
- <dd>When passed a number n, this method will return the name of the nth key in the storage.</dd>
-</dl>
-
-<dl>
- <dt>{{domxref("Storage.getItem()")}}</dt>
- <dd>When passed a key name, will return that key's value.</dd>
- <dt>{{domxref("Storage.setItem()")}}</dt>
- <dd>When passed a key name and value, will add that key to the storage, or update that key's value if it already exists.</dd>
- <dt>{{domxref("Storage.removeItem()")}}</dt>
- <dd>When passed a key name, will remove that key from the storage.</dd>
- <dt>{{domxref("Storage.clear()")}}</dt>
- <dd>When invoked, will empty all keys out of the storage.</dd>
-</dl>
-
-<h2 id="Examples">Examples</h2>
-
-<p>Here we access a <code>Storage</code> object by calling <code>localStorage</code>. We first test whether the local storage contains data items using <code>!localStorage.getItem('bgcolor')</code>. If it does, we run a function called <code>setStyles()</code> that grabs the data items using {{domxref("Storage.getItem()")}} and uses those values to update page styles. If it doesn't, we run another function, <code>populateStorage()</code>, which uses {{domxref("Storage.setItem()")}} to set the item values, then runs <code>setStyles()</code>.</p>
-
-<pre class="brush: js">if(!localStorage.getItem('bgcolor')) {
- populateStorage();
-}
-setStyles();
-
-function populateStorage() {
- localStorage.setItem('bgcolor', document.getElementById('bgcolor').value);
- localStorage.setItem('font', document.getElementById('font').value);
- localStorage.setItem('image', document.getElementById('image').value);
-}
-
-function setStyles() {
- var currentColor = localStorage.getItem('bgcolor');
- var currentFont = localStorage.getItem('font');
- var currentImage = localStorage.getItem('image');
-
- document.getElementById('bgcolor').value = currentColor;
- document.getElementById('font').value = currentFont;
- document.getElementById('image').value = currentImage;
-
- htmlElem.style.backgroundColor = '#' + currentColor;
- pElem.style.fontFamily = currentFont;
- imgElem.setAttribute('src', currentImage);
-}</pre>
-
-<div class="note">
-<p><strong>Note</strong>: To see this running as a complete working example, see our <a href="https://mdn.github.io/dom-examples/web-storage/">Web Storage Demo</a>.</p>
-</div>
-
-<h2 id="Specifications">Specifications</h2>
-
-<table class="standard-table">
- <tbody>
- <tr>
- <th scope="col">Specification</th>
- <th scope="col">Status</th>
- <th scope="col">Comment</th>
- </tr>
- <tr>
- <td>{{SpecName('HTML WHATWG', 'webstorage.html#the-storage-interface', 'Storage')}}</td>
- <td>{{Spec2('HTML WHATWG')}}</td>
- <td> </td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="Browser_compatibility">Browser compatibility</h2>
-
-
-
-<p>{{Compat("api.Storage")}}</p>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li><a href="/en-US/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API">Using the Web Storage API</a></li>
- <li><a href="/en-US/docs/Web/API/Window/localStorage">Window.localStorage</a></li>
-</ul>