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+---
+title: FetchEvent
+slug: Web/API/FetchEvent
+tags:
+  - API
+  - FetchEvent
+  - Interface
+  - NeedsTranslation
+  - Offline
+  - Reference
+  - Service Workers
+  - TopicStub
+  - Workers
+translation_of: Web/API/FetchEvent
+---
+<p>{{SeeCompatTable}}{{APIRef("Service Workers API")}}</p>
+
+<p><span class="seoSummary">This is the event type for <code>fetch</code> events dispatched on the {{domxref("ServiceWorkerGlobalScope", "service worker global scope", "", 1)}}. It contains information about the fetch, including the request and how the receiver will treat the response. It provides the {{domxref("FetchEvent.respondWith", "event.respondWith()")}} method, which allows us to provide a response to this fetch.</span></p>
+
+<h2 id="Constructor">Constructor</h2>
+
+<dl>
+ <dt>{{domxref("FetchEvent.FetchEvent()", "FetchEvent()")}}</dt>
+ <dd>Creates a new <code>FetchEvent</code> object. This constructor is not typically used. The browser creates these objects itself and provides them to <code>fetch</code> event callbacks.</dd>
+</dl>
+
+<h2 id="Properties">Properties</h2>
+
+<p><em>Inherits properties from its ancestor, {{domxref("Event")}}</em>.</p>
+
+<dl>
+ <dt>{{domxref("fetchEvent.clientId")}} {{readonlyInline}}</dt>
+ <dd>The {{domxref("Client.id", "id")}} of the same-origin {{domxref("Client", "client")}} that initiated the fetch.</dd>
+ <dt>{{domxref("fetchEvent.preloadResponse")}} {{readonlyinline}}</dt>
+ <dd>A {{jsxref("Promise")}} for a {{domxref("Response")}}, or void if this is not a navigation, or {{domxref("NavigationPreloadManager", "navigation preload", "", 1)}} is not enabled.</dd>
+ <dt>{{domxref("fetchEvent.request")}} {{readonlyInline}}</dt>
+ <dd>The {{domxref("Request")}} the browser intends to make.</dd>
+</dl>
+
+<h2 id="Methods">Methods</h2>
+
+<p><em>Inherits methods from its parent, </em><em>{{domxref("ExtendableEvent")}}</em>.</p>
+
+<dl>
+ <dt>{{domxref("fetchEvent.respondWith()")}}</dt>
+ <dd>Prevent the browser's default fetch handling, and provide (a promise for) a response yourself.</dd>
+ <dt>{{domxref("extendableEvent.waitUntil()")}}</dt>
+ <dd>
+ <p>Extends the lifetime of the event. Used to notify the browser of tasks that extend beyond the returning of a response, such as streaming and caching.</p>
+ </dd>
+</dl>
+
+<h2 id="Examples">Examples</h2>
+
+<p>This fetch event uses the browser default for non-GET requests. For GET requests it tries to return a match in the cache, and falls back to the network. If it finds a match in the cache, it asynchronously updates the cache for next time.</p>
+
+<pre class="brush: js">addEventListener('fetch', event =&gt; {
+  // Let the browser do its default thing
+  // for non-GET requests.
+  if (event.request.method != 'GET') return;
+
+  // Prevent the default, and handle the request ourselves.
+  event.respondWith(async function() {
+    // Try to get the response from a cache.
+    const cache = await caches.open('dynamic-v1');
+    const cachedResponse = await cache.match(event.request);
+
+    if (cachedResponse) {
+      // If we found a match in the cache, return it, but also
+      // update the entry in the cache in the background.
+      event.waitUntil(cache.add(event.request));
+      return cachedResponse;
+    }
+
+    // If we didn't find a match in the cache, use the network.
+    return fetch(event.request);
+  }());
+});</pre>
+
+<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('Service Workers', '#fetch-event-section', 'FetchEvent')}}</td>
+   <td>{{Spec2('Service Workers')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>
+
+
+<p>{{Compat("api.FetchEvent")}}</p>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("Promise")}}</li>
+ <li><a href="/en-US/docs/Web/API/Fetch_API">Fetch API</a></li>
+</ul>