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<h1 class="article-title" itemprop="name">Use in Express.js</h1>
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<a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs/edit/master/docs/source/tutorials/use-in-expressjs.md" 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 target="_blank" rel="noopener external nofollow noreferrer" href="https://expressjs.com/en/resources/template-engines.html">express template engines</a>. You can set liquidjs instance to the <a target="_blank" rel="noopener external nofollow noreferrer" href="https://expressjs.com/en/guide/using-template-engines.html">view engine</a> option:</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">var</span> <span class="token punctuation">{</span> Liquid <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'liquidjs'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">var</span> engine <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Liquid</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// register liquid engine</span>
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app<span class="token punctuation">.</span><span class="token function">engine</span><span class="token punctuation">(</span><span class="token string">'liquid'</span><span class="token punctuation">,</span> engine<span class="token punctuation">.</span><span class="token function">express</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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app<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token string">'views'</span><span class="token punctuation">,</span> <span class="token string">'./views'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// specify the views directory</span>
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app<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token string">'view engine'</span><span class="token punctuation">,</span> <span class="token string">'liquid'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// set liquid to default</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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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/LiquidOptions.html#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 target="_blank" rel="noopener external nofollow noreferrer" href="https://expressjs.com/en/guide/using-template-engines.html"><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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<pre class="line-numbers language-none"><code class="language-none">.
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├── views1/
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│ └── hello.liquid
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└── views2/
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└── world.liquid<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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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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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">var</span> <span class="token punctuation">{</span> Liquid <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'liquidjs'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">var</span> engine <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Liquid</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
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<span class="token literal-property property">root</span><span class="token operator">:</span> <span class="token string">'./views1/'</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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app<span class="token punctuation">.</span><span class="token function">engine</span><span class="token punctuation">(</span><span class="token string">'liquid'</span><span class="token punctuation">,</span> engine<span class="token punctuation">.</span><span class="token function">express</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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app<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token string">'views'</span><span class="token punctuation">,</span> <span class="token string">'./views2'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// specify the views directory</span>
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app<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token string">'view engine'</span><span class="token punctuation">,</span> <span class="token string">'liquid'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// set liquid to default</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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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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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript">res<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span><span class="token string">'hello'</span><span class="token punctuation">)</span>
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res<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span><span class="token string">'world'</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>
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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/LiquidOptions.html#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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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">var</span> <span class="token punctuation">{</span> Liquid <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'liquidjs'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">var</span> engine <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Liquid</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
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<span class="token literal-property property">cache</span><span class="token operator">:</span> process<span class="token punctuation">.</span>env<span class="token punctuation">.</span><span class="token constant">NODE_ENV</span> <span class="token operator">===</span> <span class="token string">'production'</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
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