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'ap-o-toc contentmenuopen' : 'ap-o-toc'" i-amphtml-binding> <label class="ap-o-toc-toggle" for="toc" on="tap:AMP.setState({contentmenuopen: !contentmenuopen})" role="contentmenutrigger" tabindex="0"> <span class="ap-o-toc-hl">Table of contents</span> <span class="nav-icon"> <svg class="ap-a-ico"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> </label> <input class="-oh -of" type="checkbox" name="toc" id="toc" autocomplete="off"> <ul><li><a href="#setup">Setup</a></li> <li><a href="#usage">Usage</a><ul> <li><a href="#creating-optimized-amp-at-build-time">Creating optimized AMP at Build-Time</a></li> <li><a href="#render-time">Render-time</a></li> </ul> </li> <li><a href="#configuration">Configuration</a><ul> <li><a href="#image-optimization">Image Optimization</a></li> </ul> </li></ul> </div> </section> <section class="-t"> <label class="-op -ol ap-a-sidebar-mobile-toggle-label-sidebar" for="sidebar" on="tap:sidebar-left.toggle" role="categoriemenutrigger" tabindex="0"> <span class="label-icon"><svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sidebar-toggle"/></svg></span> <span class="label-title">Toggle Sidebar</span> </label> <label class="-op -og ap-a-sidebar-desktop-toggle-label-sidebar" for="sidebar-desktop" role="categoriemenutrigger-desktop" tabindex="0"> <span class="label-icon"><svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#sidebar-toggle"/></svg></span> <span class="label-title">Toggle Sidebar</span> </label> <nav class="-ou"> <a class="ap-m-breadcrumbs-crumb" href="/documentation/">Documentation</a> <span class="ap-m-breadcrumbs-divider"> <svg class="ap-a-ico -oa"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> <a class="ap-m-breadcrumbs-crumb" href="/documentation/guides-and-tutorials/">Guides & Tutorials</a> <span class="ap-m-breadcrumbs-divider"> <svg class="ap-a-ico -oa"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#angle-down-solid"/></svg> </span> <div class="ap-m-breadcrumbs-crumb">Using an AMP Optimizer</div> </nav> <h1>Node.js AMP Optimizer Guide</h1> <p>This guide explains how to setup and use the Node.js version of AMP Optimizer.</p> <h2 id="setup">Setup</h2> <p>Install via NPM using:</p> <div class="-ta"><pre><span></span><code>npm install @ampproject/toolbox-optimizer </code></pre></div> <h2 id="usage">Usage</h2> <p>The AMP Optimizer API takes an HTML string as input and returns an optimized version of the HTML string. The basic usage looks like this:</p> <div class="-ta"><pre><span></span><code><span class="kr">const</span> <span class="nx">AmpOptimizer</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'@ampproject/toolbox-optimizer'</span><span class="p">);</span> <span class="c1">// create the AMP Optimizer instance</span> <span class="kr">const</span> <span class="nx">ampOptimizer</span> <span class="o">=</span> <span class="nx">AmpOptimizer</span><span class="p">.</span><span class="nx">create</span><span class="p">();</span> <span class="kr">const</span> <span class="nx">html</span> <span class="o">=</span> <span class="s1">'<h1>Hello World!</h1>'</span><span class="p">;</span> <span class="kr">const</span> <span class="nx">optimizedHtml</span> <span class="o">=</span> <span class="nx">await</span> <span class="nx">ampOptimizer</span><span class="p">.</span><span class="nx">transformHtml</span><span class="p">(</span><span class="nx">html</span><span class="p">);</span> </code></pre></div> <h3 id="creating-optimized-amp-at-build-time">Creating optimized AMP at Build-Time</h3> <p>For static sites it’s best to optimize AMP pages at build-time when building your site. Here is an example on how you would integrate it into a <a href="https://gulpjs.com/">Gulp.js</a> based build. This example adds a custom transform that optimizes all HTML files inside the src folder:</p> <div class="-ta"><pre><span></span><code><span class="kr">const</span> <span class="p">{</span><span class="nx">src</span><span class="p">,</span> <span class="nx">dest</span><span class="p">}</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'gulp'</span><span class="p">);</span> <span class="kr">const</span> <span class="nx">through2</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'through2'</span><span class="p">);</span> <span class="kr">const</span> <span class="nx">AmpOptimizer</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'@ampproject/toolbox-optimizer'</span><span class="p">);</span> <span class="kr">const</span> <span class="nx">ampOptimizer</span> <span class="o">=</span> <span class="nx">AmpOptimizer</span><span class="p">.</span><span class="nx">create</span><span class="p">();</span> <span class="kd">function</span> <span class="nx">build</span><span class="p">(</span><span class="nx">cb</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="nx">src</span><span class="p">(</span><span class="s1">'src/*.html'</span><span class="p">)</span> <span class="p">.</span><span class="nx">pipe</span><span class="p">(</span> <span class="nx">through2</span><span class="p">.</span><span class="nx">obj</span><span class="p">(</span><span class="nx">async</span> <span class="p">(</span><span class="nx">file</span><span class="p">,</span> <span class="nx">_</span><span class="p">,</span> <span class="nx">cb</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span> <span class="k">if</span> <span class="p">(</span><span class="nx">file</span><span class="p">.</span><span class="nx">isBuffer</span><span class="p">())</span> <span class="p">{</span> <span class="kr">const</span> <span class="nx">optimizedHtml</span> <span class="o">=</span> <span class="nx">await</span> <span class="nx">ampOptimizer</span><span class="p">.</span><span class="nx">transformHtml</span><span class="p">(</span> <span class="nx">file</span><span class="p">.</span><span class="nx">contents</span><span class="p">.</span><span class="nx">toString</span><span class="p">()</span> <span class="p">);</span> <span class="nx">file</span><span class="p">.</span><span class="nx">contents</span> <span class="o">=</span> <span class="nx">Buffer</span><span class="p">.</span><span class="nx">from</span><span class="p">(</span><span class="nx">optimizedHtml</span><span class="p">);</span> <span class="p">}</span> <span class="nx">cb</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="nx">file</span><span class="p">);</span> <span class="p">})</span> <span class="p">)</span> <span class="p">.</span><span class="nx">pipe</span><span class="p">(</span><span class="nx">dest</span><span class="p">(</span><span class="s1">'dist/'</span><span class="p">));</span> <span class="p">}</span> <span class="nx">exports</span><span class="p">.</span><span class="k">default</span> <span class="o">=</span> <span class="nx">build</span><span class="p">;</span> </code></pre></div> <h3 id="render-time">Render-time</h3> <p>For dynamic pages it’s often necessary to render pages on the server. In this case, you can run AMP Optimizer after rendering your pages. Here is a sample integration into an <a href="https://expressjs.com/">Express.js</a> server. One way to integrate AMP Optimization into an Express router is to run it in a callback after the templates are <a href="https://expressjs.com/en/api.html#app.render">rendered</a>:</p> <div class="-ta"><pre><span></span><code><span class="kr">const</span> <span class="nx">express</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'express'</span><span class="p">);</span> <span class="kr">const</span> <span class="nx">router</span> <span class="o">=</span> <span class="nx">express</span><span class="p">.</span><span class="nx">Router</span><span class="p">();</span> <span class="kr">const</span> <span class="nx">AmpOptimizer</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'@ampproject/toolbox-optimizer'</span><span class="p">);</span> <span class="kr">const</span> <span class="nx">ampOptimizer</span> <span class="o">=</span> <span class="nx">AmpOptimizer</span><span class="p">.</span><span class="nx">create</span><span class="p">();</span> <span class="nx">router</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="s1">'/'</span><span class="p">,</span> <span class="p">(</span><span class="nx">req</span><span class="p">,</span> <span class="nx">res</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span> <span class="kr">const</span> <span class="nx">locals</span> <span class="o">=</span> <span class="p">{</span><span class="nx">title</span><span class="o">:</span> <span class="s1">'Express with AMP Optimizer'</span><span class="p">};</span> <span class="nx">res</span><span class="p">.</span><span class="nx">render</span><span class="p">(</span><span class="s1">'index'</span><span class="p">,</span> <span class="nx">locals</span><span class="p">,</span> <span class="nx">async</span> <span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">html</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span> <span class="kr">const</span> <span class="nx">optimizedHtml</span> <span class="o">=</span> <span class="nx">await</span> <span class="nx">ampOptimizer</span><span class="p">.</span><span class="nx">transformHtml</span><span class="p">(</span><span class="nx">html</span><span class="p">);</span> <span class="nx">res</span><span class="p">.</span><span class="nx">send</span><span class="p">(</span><span class="nx">optimizedHtml</span><span class="p">);</span> <span class="p">});</span> <span class="p">});</span> <span class="nx">module</span><span class="p">.</span><span class="nx">exports</span> <span class="o">=</span> <span class="nx">router</span><span class="p">;</span> </code></pre></div> <p> </p><div class="ap-m-tip"> <div class="ap-a-ico ap-m-tip-icon"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#warning-sign"/></svg> </div> <div class="ap-m-tip-content"> Make sure to setup caching or a CDN when using AMP Optimizer on the server to avoid render delays. </div> </div><p></p> <h2 id="configuration">Configuration</h2> <p>AMP Optimizer provides a reasonable default configuration that should work well in most of the cases. However, transformations can be customized for specific use cases. You can find a list of all available options <a href="https://github.com/ampproject/amp-toolbox/tree/main/packages/optimizer#options">here</a>.</p> <p>A few notable options are:</p> <ul> <li><code>lts: true</code> for enabling <a href="https://github.com/ampproject/amphtml/blob/main/docs/lts-release.md">long-term stable URLs</a> for AMP runtime and components.</li> <li><code>verbose: true</code> for detailed debugging outputs. Especially good for identifying reasons why the AMP boilerplate could not be removed.</li> <li><code>imageOptimizer</code>: enable automated image srcset generation by providing a function for calculating srcset URLs for a given image src. The function should return a URL pointing to a version of the <code>src</code> image with the given width. If no image is available, it should return a falsy value. More about this in the next section.</li> </ul> <h3 id="image-optimization">Image Optimization</h3> <p>AMP Optimizer can generate <code>srcset</code> values for a given <code>amp-img</code> based on its <code>layout</code> definition. For this to work, you need to provide a function that maps the image’s <code>src</code> and a <code>width</code> to a resized <code>srcset</code> source value. The image resizing is not performed by AMP Optimizer and needs to either happen at build time (e.g. for static sites) or via an image hosting service such as <a href="https://github.com/thumbor/thumbor">thumbor</a>.</p> <p>Here is an example implementation that appends the image width to the <code>src</code>:</p> <div class="-ta"><pre><span></span><code><span class="kr">const</span> <span class="nx">ampOptimizer</span> <span class="o">=</span> <span class="nx">AmpOptimizer</span><span class="p">.</span><span class="nx">create</span><span class="p">({</span> <span class="c1">// parameters are the amp-img `src` and the `width` of the to be generated srcset source value</span> <span class="nx">imageOptimizer</span><span class="o">:</span> <span class="p">(</span><span class="nx">src</span><span class="p">,</span> <span class="nx">width</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span> <span class="c1">// we cannot rename if the image does not have a file extension</span> <span class="kr">const</span> <span class="nx">index</span> <span class="o">=</span> <span class="nx">src</span><span class="p">.</span><span class="nx">lastIndexOf</span><span class="p">(</span><span class="s1">'.'</span><span class="p">);</span> <span class="k">if</span> <span class="p">(</span><span class="nx">index</span> <span class="o">===</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span> <span class="c1">// return null means we won't generate a srcset source value for this width</span> <span class="k">return</span> <span class="kc">null</span><span class="p">;</span> <span class="p">}</span> <span class="kr">const</span> <span class="nx">prefix</span> <span class="o">=</span> <span class="nx">src</span><span class="p">.</span><span class="nx">substring</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="nx">index</span><span class="p">);</span> <span class="kr">const</span> <span class="nx">postfix</span> <span class="o">=</span> <span class="nx">src</span><span class="p">.</span><span class="nx">substring</span><span class="p">(</span><span class="nx">index</span><span class="p">,</span> <span class="nx">src</span><span class="p">.</span><span class="nx">length</span><span class="p">);</span> <span class="k">return</span> <span class="sb">`</span><span class="si">${</span><span class="nx">prefix</span><span class="si">}</span><span class="sb">.</span><span class="si">${</span><span class="nx">width</span><span class="si">}</span><span class="sb">w</span><span class="si">${</span><span class="nx">postfix</span><span class="si">}</span><span class="sb">`</span><span class="p">;</span> <span class="p">};</span> <span class="p">})</span> </code></pre></div> <p>Using this implementation, AMP Optimizer will transform the following <code>amp-img</code> declarations:</p> <div class="-ta"><pre><span></span><code><span class="c"></span> <span class="p"><</span><span class="nt">amp-img</span> <span class="na">src</span><span class="o">=</span><span class="s">"image1.png"</span> <span class="na">width</span><span class="o">=</span><span class="s">"400"</span> <span class="na">height</span><span class="o">=</span><span class="s">"800"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"responsive"</span> <span class="na">alt</span><span class="o">=</span><span class="s">"..."</span> <span class="p">></</span><span class="nt">amp-img</span><span class="p">></span> <span class="c"></span> <span class="p"><</span><span class="nt">amp-img</span> <span class="na">layout</span><span class="o">=</span><span class="s">"fill"</span> <span class="na">alt</span><span class="o">=</span><span class="s">"..."</span> <span class="na">srcset</span><span class="o">=</span><span class="s">"image-1x.png 1x, image-2x.png 2x"</span> <span class="p">></</span><span class="nt">amp-img</span><span class="p">></span> </code></pre></div> <p>into:</p> <div class="-ta"><pre><span></span><code><span class="c"></span> <span class="p"><</span><span class="nt">amp-img</span> <span class="na">src</span><span class="o">=</span><span class="s">"image1.png"</span> <span class="na">width</span><span class="o">=</span><span class="s">"400"</span> <span class="na">height</span><span class="o">=</span><span class="s">"800"</span> <span class="na">layout</span><span class="o">=</span><span class="s">"responsive"</span> <span class="na">alt</span><span class="o">=</span><span class="s">"..."</span> <span class="na">srcset</span><span class="o">=</span><span class="s">"image1.470w.png 470w, image1.820w.png 820w, image1.1440w.png 1440w"</span> <span class="p">></</span><span class="nt">amp-img</span><span class="p">></span> <span class="c"></span> <span class="p"><</span><span class="nt">amp-img</span> <span class="na">layout</span><span class="o">=</span><span class="s">"fill"</span> <span class="na">alt</span><span class="o">=</span><span class="s">"..."</span> <span class="na">srcset</span><span class="o">=</span><span class="s">"image-1x.png 1x, image-2x.png 2x"</span> <span class="p">></</span><span class="nt">amp-img</span><span class="p">></span> </code></pre></div> <p> </p><div class="ap-m-tip"> <div class="ap-a-ico ap-m-tip-icon"> <svg><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#speech-bubble"/></svg> </div> <div class="ap-m-tip-content"> When using <code>layout=responsive</code> use the <code>width</code> and <code>height</code> attribute to specify the minimum image dimensions. For example, for a full-bleed hero image on mobile, specify the width as <code>width=320</code>. </div> </div><p></p> </section> <section class="-t"> <hr> <ul class="ap-o-mini-card-list"> <li class="ap-o-mini-card-list-item"> <div class="ap-m-mini-card"> <amp-img alt="Author avatar" src="https://github.com/sebastianbenz.png?size=38" width="38" height="38" class="large i-amphtml-layout-responsive i-amphtml-layout-size-defined" style="max-width: 38px" layout="responsive" i-amphtml-layout="responsive"><i-amphtml-sizer slot="i-amphtml-svc" style="display:block;padding-top:100%"></i-amphtml-sizer> </amp-img> <span> <strong>Written by <a href="https://github.com/sebastianbenz" rel="nofollow" target="_blank"> @sebastianbenz </a> </strong> </span> </div></li> </ul> </section> </div> </main> <amp-sidebar id="sidebar-left" class="ap--ampsidebar i-amphtml-layout-nodisplay" layout="nodisplay" side="left" hidden="hidden" i-amphtml-layout="nodisplay"> <nav class="ap--ampsidebar-toolbar" 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xlink:href="#angle-down-light"/></svg> </div> <ul class="nav-list level-3"> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/animations/triggering_css_animations/"> Triggering CSS animations & transitions </a> </li> <li class="nav-item level-3"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/animations/introduction_to_animations/"> Introduction to complex animations </a> </li> </ul> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/custom-javascript/"> Use custom JavaScript in AMP pages </a> </li> <li class="nav-item level-2"> <a class="nav-link" href="/documentation/guides-and-tutorials/websites/develop/monetization/"> <span>Monetize your AMP pages</span> </a> <input class="nav-trigger" type="checkbox"> <div class="nav-icon"> <svg class="ap-a-ico light"><use xmlns:xlink="http://www.w3.org/1999/xlink" 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