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<strong class="sidebar-title">Getting Started</strong><a href="intro-to-liquid.html" class="sidebar-link">Intro to Liquid</a><a href="setup.html" class="sidebar-link">Setup</a><a href="options.html" class="sidebar-link">Options</a><a href="render-file.html" class="sidebar-link">Render Files</a><a href="partials-and-layouts.html" class="sidebar-link">Includes and Layouts</a><a href="use-in-expressjs.html" class="sidebar-link current">Use in Express.js</a><strong class="sidebar-title">Advanced</strong><a href="caching.html" class="sidebar-link">Caching</a><a href="register-filters-tags.html" class="sidebar-link">Register Filters/Tags</a><a href="whitespace-control.html" class="sidebar-link">Whitespace Control</a><a href="plugins.html" class="sidebar-link">Plugins</a><a href="operators.html" class="sidebar-link">Operators</a><a href="truthy-and-falsy.html" class="sidebar-link">Truthy and Falsy</a><strong class="sidebar-title">Miscellaneous</strong><a href="migrate-to-9.html" class="sidebar-link">Migrate to LiquidJS 9</a><a href="changelog.html" class="sidebar-link">Changelog</a><a href="differences.html" class="sidebar-link">Differences with Shopify/liquid</a><a href="contribution-guidelines.html" class="sidebar-link">Contribution Guidelines</a>
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<h1 class="article-title" itemprop="name">Use in Express.js</h1>
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<a href="https://github.com/harttle/liquidjs/edit/master/docs/source/tutorials/use-in-expressjs.md" target="_blank" rel="noopener external nofollow noreferrer" class="article-edit-link" title="Improve this doc"><i class="icon-pencil"></i></a>
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<p>LiquidJS is compatible to the <a href="https://expressjs.com/en/resources/template-engines.html" target="_blank" rel="noopener external nofollow noreferrer">express template engines</a>. You can set liquidjs instance to the <a href="http://expressjs.com/en/guide/using-template-engines.html" target="_blank" rel="noopener external nofollow noreferrer">view engine</a> option:</p>
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<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">var</span> { Liquid } = <span class="built_in">require</span>(<span class="string">'liquidjs'</span>);</span><br><span class="line"><span class="keyword">var</span> engine = <span class="keyword">new</span> Liquid();</span><br><span class="line"></span><br><span class="line"><span class="comment">// register liquid engine</span></span><br><span class="line">app.engine(<span class="string">'liquid'</span>, engine.express()); </span><br><span class="line">app.set(<span class="string">'views'</span>, <span class="string">'./views'</span>); <span class="comment">// specify the views directory</span></span><br><span class="line">app.set(<span class="string">'view engine'</span>, <span class="string">'liquid'</span>); <span class="comment">// set liquid to default</span></span><br></pre></td></tr></table></figure>
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<blockquote class="note info"><strong class="note-title">Working Demo</strong><p>Here’s a working demo for LiquidJS usage in Express.js: <a href="https://github.com/harttle/liquidjs/blob/master/demo/express/" rel="external nofollow noreferrer" target="_blank">liquidjs/demo/express/</a>.</p>
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</blockquote>
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<h2 id="Template-Lookup" class="article-heading"><a href="#Template-Lookup" class="headerlink" title="Template Lookup"></a>Template Lookup<a class="article-anchor" href="#Template-Lookup" aria-hidden="true"></a></h2><p>The <a href="../api/interfaces/liquid_options_.liquidoptions.html#Optional-root">root</a> option will continue to work as templates root, as you can see in <a href="./render-a-file.html">Render A Template File</a>. Additionally, the <a href="http://expressjs.com/en/guide/using-template-engines.html" target="_blank" rel="noopener external nofollow noreferrer"><code>views</code></a> option in express.js (as shown above) will also be respected. Say you have a template directory like:</p>
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<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">.</span><br><span class="line">├── views1/</span><br><span class="line">│ └── hello.liquid</span><br><span class="line">└── views2/</span><br><span class="line"> └── world.liquid</span><br></pre></td></tr></table></figure>
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<p>And you’re setting template root for liquidjs to <code>views1</code> and expressjs to <code>views2</code>:</p>
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<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">var</span> { Liquid } = <span class="built_in">require</span>(<span class="string">'liquidjs'</span>);</span><br><span class="line"><span class="keyword">var</span> engine = <span class="keyword">new</span> Liquid({</span><br><span class="line"> root: <span class="string">'./views1/'</span></span><br><span class="line">});</span><br><span class="line"></span><br><span class="line">app.engine(<span class="string">'liquid'</span>, engine.express()); </span><br><span class="line">app.set(<span class="string">'views'</span>, <span class="string">'./views2'</span>); <span class="comment">// specify the views directory</span></span><br><span class="line">app.set(<span class="string">'view engine'</span>, <span class="string">'liquid'</span>); <span class="comment">// set liquid to default</span></span><br></pre></td></tr></table></figure>
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<p>Both of <code>hello.liquid</code> and <code>world.liquid</code> can be resolved and rendered:</p>
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<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">res.render(<span class="string">'hello'</span>)</span><br><span class="line">res.render(<span class="string">'world'</span>)</span><br></pre></td></tr></table></figure>
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<h2 id="Caching" class="article-heading"><a href="#Caching" class="headerlink" title="Caching"></a>Caching<a class="article-anchor" href="#Caching" aria-hidden="true"></a></h2><p>Simply setting the <a href="../api/interfaces/liquid_options_.liquidoptions.html#Optional-cache">cache option</a> to true will enable template caching, as explained in <a href="./caching.html">Caching</a>. It’s recommended to enable cache in production environment, which can be done by:</p>
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<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">var</span> { Liquid } = <span class="built_in">require</span>(<span class="string">'liquidjs'</span>);</span><br><span class="line"><span class="keyword">var</span> engine = <span class="keyword">new</span> Liquid({</span><br><span class="line"> cache: process.env.NODE_ENV === <span class="string">'production'</span></span><br><span class="line">});</span><br></pre></td></tr></table></figure>
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<time class="article-footer-updated" datetime="2021-07-26T08:52:18.055Z" itemprop="dateModified">Last updated: 2021-07-26</time>
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