Liquid with Node.js

LiquidNode is a port of the original Liquid template engine from Ruby to Node.js. It uses Promises to support non-blocking/asynchronous variables, filters, and blocks.

Features

Supports asynchronous variables, tags, functions and filters (helpers)
Allows you to add custom tags and filters easily
Uses bluebird for super-fast Promises/A+
Supports full liquid syntax
Based on original Ruby code
Written in CoffeeScript
High test coverage

What does it look like?

<ul id="products">
  {% for product in products %}
    <li>
      <h2>{{ product.name }}</h2>
      Only {{ product.price | price }}

      {{ product.description | prettyprint | paragraph }}
    </li>
  {% endfor %}
</ul>

Installation

npm install liquid-node --save

Usage

Liquid supports a very simple API based around the Liquid.Engine class. For standard use you can just pass it the content of a file and call render with an object.

Liquid = require("liquid-node")
var engine = new Liquid.Engine

engine
  .parse("hi {{name}}")
  .then(function(template) { return template.render({ name: "tobi" }); })
  .then(function(result) { console.log(result) });
  
// or

engine
  .parseAndRender("hi {{name}}", { name: "tobi" })
  .then(function(result) { console.log(result) });

Usage with Connect

app.get(function(req, res) {
  engine
    .parseAndRender("hi {{name}}", { name: "tobi" })
    .nodeify(function(err, result) {
      if (err) {
        res.end("ERROR: " + err);
      } else {
        res.end(result);
      }
    });
});

Registration of new filters

engine.registerFilters({
  myFilter: function(input) {
    return String(input).toUpperCase()
  }
});

Registration of new Tags

Since the code is based on the Ruby implementation we use CoffeeScript's class which is a little bit difficult to write in pure JavaScript. Take a look at the existing tags to see how to implement them.

class MyTag extends Liquid.Tag
  render: ->
    "that's me!"
    
engine.registerTag "MyTag", MyTag

How to run the tests

npm test

Similar libraries

darthapo's Liquid.js is liquid ported to JavaScript to be run within the browser. It doesn't handle asynchrony.
tchype's Liquid.js is liquid-node wrapped to run in a browser.

License

LiquidNode is released under the MIT license.

Tseberechts/liquid-node