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hsla(0,0%,0%,0.12);font-feature-settings:"tnum";-moz-font-feature-settings:"tnum";-ms-font-feature-settings:"tnum";-webkit-font-feature-settings:"tnum";padding-left:1rem;padding-right:1rem;padding-top:0.75rem;padding-bottom:calc(0.75rem - 1px);}th:first-child,td:first-child{padding-left:0;}th:last-child,td:last-child{padding-right:0;}a{color:hsla(0,0%,0%,0.6);text-decoration:none;border-bottom:1px dotted #666;}a:hover{color:#6bd4c8;border-bottom:none;}</style><title data-react-helmet="true">What is cache busting or content hashing? | Gatsby Central</title><link data-react-helmet="true" rel="canonical" href="/what-is-cache-busting-or-content-hashing"/><link data-react-helmet="true" rel="image_src" href="/static/gc-logo-1c7cc65d32b1f48b217cdc8b54ea74e3.png"/><meta data-react-helmet="true" name="description" content="tl;dr - A hash of the contents of a file is included in the filename. A change in the content changes the filename. These files can be…"/><meta data-react-helmet="true" name="keywords" content="What is cache busting or content hashing?"/><meta data-react-helmet="true" name="og:title" content="What is cache busting or content hashing?"/><meta data-react-helmet="true" name="og:description" content="tl;dr - A hash of the contents of a file is included in the filename. A change in the content changes the filename. 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These files can be…","datePublished":"April 10, 2018","image":"/static/gc-logo-1c7cc65d32b1f48b217cdc8b54ea74e3.png","aggregateRating":{"@type":"AggregateRating","ratingValue":0,"ratingCount":0}}</script><link rel="sitemap" type="application/xml" href="/sitemap.xml"/><link as="script" rel="preload" href="/component---src-templates-post-js-2494fffab1c7ed75513c.js"/><link as="script" rel="preload" href="/app-8856a523d0eee05cc513.js"/><link as="script" rel="preload" href="/0-3c035c770037e52d08f1.js"/><link as="script" rel="preload" href="/1-47feeafdbc673f70c13c.js"/><link as="script" rel="preload" href="/13-f991f6e141f1ea6712c7.js"/><link as="script" rel="preload" href="/2-7af2b88c2e75f2df4a3e.js"/><link as="script" rel="preload" href="/webpack-runtime-51e5d05b33fbf4453191.js"/><link rel="preload" href="/static/d/128/path---what-is-cache-busting-or-content-hashing-48-b-533-pbnHe00KYNRWljdS5Fux8SYpTg.json" as="fetch" crossOrigin="use-credentials"/><script src="https://www.google.com/recaptcha/api.js"></script></head><body><div id="___gatsby"><div style="outline:none" tabindex="-1" role="group"><div class="layout__Wrapper-qkqb77-0 dxEkxH"><div class="MainMenu__Wrapper-rbdgrt-0 fxzCbn"><div class="Container-sc-12223td-0 cYYnEP sc-htoDjs gIzvFg" title="test"><div class="MainMenu__Menu-rbdgrt-1 eiBxrh"><div class="MainMenu__MenuItem-rbdgrt-2 fntTum"><a class="MainMenu__Link-rbdgrt-3 cQviSB" href="/">Gatsby Central</a></div><div class="MainMenu__MenuRight-rbdgrt-4 fvnWzq"><div class="MainMenu__MenuItem-rbdgrt-2 fntTum"><a class="MainMenu__Link-rbdgrt-3 cQviSB" href="/#posts">Posts</a></div><div class="MainMenu__MenuItem-rbdgrt-2 fntTum"><a class="MainMenu__Link-rbdgrt-3 cQviSB" href="/#snippets">Snippets</a></div></div></div></div></div><div class="Container-sc-12223td-0 cYYnEP sc-htoDjs gIzvFg" title="test"><div style="flex:1"><div class="post__Content-tpe9o9-0 fDoFNt Content-sc-18f8mf8-0 XjFzw"><h1>What is cache busting or content hashing?</h1><span class="post__Time-tpe9o9-2 cwpqsD">2<!-- --> min read</span><div><blockquote>
<p><strong>tl;dr</strong> - A hash of the contents of a file is included in the filename. A change in the content changes the filename. These files can be cached forever. This is awesome.</p>
</blockquote>
<h2>What is a hash?</h2>
<p>There's a lot of great content on this topic already. Google has some great answers to this question.</p>
<p>Just for you. A very short summary. Hashing is a mathematical function. The hash function output is always the same size. A very small change in the input creates a large change in the output.</p>
<p>Here's a few md5 examples:</p>
<ul>
<li>
<p>Input <code class="language-text">hello</code></p>
<ul>
<li>Output <code class="language-text">5d41402abc4b2a76b9719d911017c592</code></li>
</ul>
</li>
<li>
<p>Input <code class="language-text">hello.</code></p>
<ul>
<li>Output <code class="language-text">d94c10e437d18531e122ed0b45badd2a</code></li>
</ul>
</li>
</ul>
<h2>Why do you care?</h2>
<p>Gatsby generates lots of static files. Those files have names. One part of the name is a hash. The hash is built from the contents of the file. A small change in the content of the file changes the hash.</p>
<p>Now every change creates a new filename. No matter how small the change. Each time the content changes, the file name changes. <em>Every version of a file has its own unique name</em>.</p>
<p>Great. So what?</p>
<p>So now your static files can be cached <strong>forever</strong>.</p>
<h2>Caching</h2>
<p>Gatsby is all about speed. Insanely fast static sites. One part of insanely fast is caching. Cache as much as possible.</p>
<p>The content hashing technique helps with caching. The contents of a file will never change. If the content changes, the name changes, so it's a new file. Now the static files can be cached indefinitely.</p>
<p>That's really helpful. Why? Updating a cache is hard. It's much easier to push stuff into a cache and forget about it. It never changes. Every change creates a new file. Add files. Never delete. Easy.</p>
<h2>Static files</h2>
<p>All of Gatsby's static files apply this technique. The <code class="language-text">.html</code> pages do not. You need to be able to change the content of your site. So the <code class="language-text">.html</code> pages must change over time. But otherwise, all other files can be cached forever.</p></div>Is this post useful to you? Please give us a rating!<div style="overflow:hidden;position:relative"></div><div><h2>Subscribe</h2><form class="SubscribeForm__Form-sc-1wi8ix1-0 gXyHoW" action="https://gatsbycentral.us18.list-manage.com/subscribe/post?u=7ba5fb7dfe0be75fbc4a20b01&id=d5b2592fff" method="post" target="_blank" rel="noopener noreferrer"><p>Want regular updates on Gatsby and its awesomeness? Subscribe here. No spam, promise. Full details on <a href="/privacy">privacy</a>.</p><p style="font-size:0.8em">We use MailChimp as our marketing automation platform. 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