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<strong class="sidebar-title">Getting Started</strong><a href="intro-to-liquid.html" class="sidebar-link current">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">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">Introduction to Liquid Template Language</h1>
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<a href="https://github.com/harttle/liquidjs/edit/master/docs/source/tutorials/intro-to-liquid.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 a simple, expressive, safe and shopify compatible template engine in pure JavaScript. The purpose of this repo is to provide a standard Liquid implementation for the JavaScript community. Liquid is originally implemented in Ruby and used by Github Pages, Jekyll and Shopify, see <a href="./differences.html">Differences with Shopify/liquid</a>.</p>
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<p>LiquidJS syntax is relatively simple. There’re 2 types of markups in LiquidJS:</p>
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<ul>
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<li><strong>Tags</strong>. A tag consists of a tag name and optional arguments wrapped between <code>{%</code> and <code>%}</code>.</li>
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<li><strong>Outputs</strong>. An output consists of a value and a list of filters, which is optional, wrapped between <code>{{</code> and <code>}}</code>.</li>
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</ul>
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<h2 id="Outputs" class="article-heading"><a href="#Outputs" class="headerlink" title="Outputs"></a>Outputs<a class="article-anchor" href="#Outputs" aria-hidden="true"></a></h2><p><strong>Outputs</strong> are used to output variables, which can be transformed by filters, into HTML. The following template will insert the value of <code>username</code> into the input’s value:</p>
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<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line"><input type="text" name="user" value="{{username}}"></span><br></pre></td></tr></table></figure>
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<p>Values in output can be transformed by <strong>filter</strong>s before output. To append a string after the variable:</p>
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<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">{{ username | append: ", welcome to LiquidJS!" }}</span><br></pre></td></tr></table></figure>
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<p>Filters can be chained:</p>
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<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">{{ username | append: ", welcome to LiquidJS!" | capitalize }}</span><br></pre></td></tr></table></figure>
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<p>A complete list of filters supported by LiquidJS can be found <a href="../filters/overview.html">here</a>.</p>
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<h2 id="Tags" class="article-heading"><a href="#Tags" class="headerlink" title="Tags"></a>Tags<a class="article-anchor" href="#Tags" aria-hidden="true"></a></h2><p><strong>Tags</strong> are used to control the template rendering process, manipulating template variables, inter-op with other templates, etc. For example <code>assign</code> can be used to define a variable which can be later used in the template:</p>
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<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">{% assign foo = "FOO" %}</span><br></pre></td></tr></table></figure>
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<p>Typically tags appear in pairs with a start tag and a corresponding end tag. For example:</p>
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<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">{% if foo == "FOO" %}</span><br><span class="line"> Variable `foo` equals "FOO"</span><br><span class="line">{% else %}</span><br><span class="line"> Variable `foo` not equals "FOO"</span><br><span class="line">{% endif %}</span><br></pre></td></tr></table></figure>
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<p>A complete list of tags supported by LiquidJS can be found <a href="../tags/overview.html">here</a>.</p>
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<time class="article-footer-updated" datetime="2021-06-20T13:26:42.183Z" itemprop="dateModified">Last updated: 2021-06-20</time>
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<a href="setup.html" class="article-footer-next" title="Setup"><span>Next</span><i class="icon-chevron-right"></i></a>
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<strong class="sidebar-title">Contents</strong>
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<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#Outputs"><span class="toc-text">Outputs</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Tags"><span class="toc-text">Tags</span></a></li></ol>
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© 2021 <a href="https://github.com/harttle/liquidjs/graphs/contributors" rel="external nofollow noreferrer" target="_blank">Harttle</a><br>
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Documentation licensed under <a href="http://creativecommons.org/licenses/by/4.0/" rel="external nofollow noreferrer" target="_blank">CC BY 4.0</a>.
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