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<code>fetch</code> is a little bit tricky. Remember, <code>fetch</code> returns a promise. And JavaScript generally has no concept of “aborting” a promise. So how can we cancel a fetch?</p> <p>There’s a special built-in object for such purposes: <code>AbortController</code>.</p> <p>The usage is pretty simple:</p> <ul> <li> <p>Step 1: create a controller:</p> <div id="lf4egt52iz" data-trusted="1" class="code-example"> <div class="codebox code-example__codebox"> <div class="codebox__code" data-code="1"> <pre class="line-numbers language-javascript"><code>let controller = new AbortController();</code></pre> </div> </div> </div><p>A controller is an extremely simple object. It has a single method <code>abort()</code>, and a single property <code>signal</code>. When <code>abort()</code> is called, the <code>abort</code> event triggers on <code>controller.signal</code>:</p> <p>Like this:</p> <div id="up60vn3agk" data-trusted="1" class="code-example"> <div class="codebox code-example__codebox"> <div class="toolbar codebox__toolbar"> <div class="toolbar__tool"> <a href="#" title="Çalıştır" data-action="run" class="toolbar__button toolbar__button_run"></a> </div> <div class="toolbar__tool"> <a href="#" title="Korumalı alanda aç" target="_blank" data-action="edit" class="toolbar__button toolbar__button_edit"></a> </div> </div> <div class="codebox__code" data-code="1"> <pre class="line-numbers language-javascript"><code>let controller = new AbortController(); let signal = controller.signal; // triggers when controller.abort() is called signal.addEventListener('abort', () => alert("abort!")); controller.abort(); // abort! alert(signal.aborted); // true (after abort)</code></pre> </div> </div> </div></li> <li> <p>Step 2: pass the <code>signal</code> property to <code>fetch</code> option:</p> <div id="qfx71swmdc" data-trusted="1" class="code-example"> <div class="codebox code-example__codebox"> <div class="codebox__code" data-code="1"> <pre class="line-numbers language-javascript"><code>let controller = new AbortController(); fetch(url, { signal: controller.signal });</code></pre> </div> </div> </div><p>Now <code>fetch</code> listens to the signal.</p> </li> <li> <p>Step 3: to abort, call <code>controller.abort()</code>:</p> <div id="uuppid58j4" data-trusted="1" class="code-example"> <div class="codebox code-example__codebox"> <div class="codebox__code" data-code="1"> <pre class="line-numbers language-javascript"><code>controller.abort();</code></pre> </div> </div> </div><p>We’re done: <code>fetch</code> gets the event from <code>signal</code> and aborts the request.</p> </li> </ul> <p>When a fetch is aborted, its promise rejects with an error named <code>AbortError</code>, so we should handle it:</p> <div id="gtf4kmssb4" data-trusted="1" class="code-example" data-async="1"> <div class="codebox code-example__codebox"> <div class="toolbar codebox__toolbar"> <div class="toolbar__tool"> <a href="#" title="Çalıştır" data-action="run" class="toolbar__button toolbar__button_run"></a> </div> <div class="toolbar__tool"> <a href="#" title="Korumalı alanda aç" target="_blank" data-action="edit" class="toolbar__button toolbar__button_edit"></a> </div> </div> <div class="codebox__code" data-code="1"> <pre class="line-numbers language-javascript"><code>// abort in 1 second let controller = new AbortController(); setTimeout(() => controller.abort(), 1000); try { let response = await fetch('/article/fetch-abort/demo/hang', { signal: controller.signal }); } catch(err) { if (err.name == 'AbortError') { // handle abort() alert("Aborted!"); } else { throw err; } }</code></pre> </div> </div> </div><p><strong><code>AbortController</code> is scalable, it allows to cancel multiple fetches at once.</strong></p> <p>For instance, here we fetch many <code>urls</code> in parallel, and the controller aborts them all:</p> <div id="zo76m4edsv" data-trusted="1" class="code-example"> <div class="codebox code-example__codebox"> <div class="codebox__code" data-code="1"> <pre class="line-numbers language-javascript"><code>let urls = [...]; // a list of urls to fetch in parallel let controller = new AbortController(); let fetchJobs = urls.map(url => fetch(url, { signal: controller.signal })); let results = await Promise.all(fetchJobs); // from elsewhere: // controller.abort() stops all fetches</code></pre> </div> </div> </div><p>If we have our own jobs, different from <code>fetch</code>, we can use a single <code>AbortController</code> to stop those, together with fetches.</p> <div id="7fr5qefmc4" data-trusted="1" class="code-example"> <div class="codebox code-example__codebox"> <div class="codebox__code" data-code="1"> <pre class="line-numbers language-javascript"><code>let urls = [...]; let controller = new AbortController(); let ourJob = new Promise((resolve, reject) => { ... controller.signal.addEventListener('abort', reject); }); let fetchJobs = urls.map(url => fetch(url, { signal: controller.signal })); let results = await Promise.all([...fetchJobs, ourJob]); // from elsewhere: // controller.abort() stops all fetches and ourJob</code></pre> </div> </div> </div></div></article></div><div class="page__nav-wrap"><a class="page__nav page__nav_prev" href="/fetch-progress" data-tooltip="Fetch: Download progress"><span class="page__nav-text"><span class="page__nav-text-shortcut"></span></span><span class="page__nav-text-alternate">Önceki ders</span></a><a class="page__nav page__nav_next" href="/fetch-crossorigin" data-tooltip="Fetch: Cross-Origin Requests"><span class="page__nav-text"><span class="page__nav-text-shortcut"></span></span><span class="page__nav-text-alternate">Bir sonraki ders</span></a></div><div class="article-tablet-foot tablet-only"><div class="article-tablet-foot__layout"><div class="share-icons"><span class="share-icons__title">Paylaş</span><a class="share share_tw" href="https://twitter.com/share?url=https%3A%2F%2Ftr.javascript.info%2Ffetch-abort" rel="nofollow"></a><a class="share share_fb" href="https://www.facebook.com/sharer/sharer.php?s=100&p%5Burl%5D=https%3A%2F%2Ftr.javascript.info%2Ffetch-abort" rel="nofollow"></a></div><div class="article-tablet-foot__map"><a class="map" href="/tutorial/map" data-action="tutorial-map"><span class="map__text">Eğitim haritası</span></a></div></div></div><div class="comments formatted" id="comments"><div class="comments__header"><h2 class="comments__header-title"><a href="#comments" name="comments">Yorumlar</a></h2><div class="comments__read-before"><span class="comments__read-before-link">yorum yapmadan önce lütfen okuyun...</span><div class="comments__read-before-popup"><div class="comments__read-before-popup-i"><ul><li>Eğer geliştirme ile alakalı bir öneriniz var ise yorum yerine <a href="https://github.com/javascript-tutorial/en.javascript.info/issues/new">github konusu gönderiniz</a>.</li><li>Eğer makalede bir yeri anlamadıysanız lütfen belirtiniz.</li><li>Koda birkaç satır eklemek için <code><code></code> kullanınız, birkaç satır eklemek için ise <code><pre></code> kullanın. 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