Swig

<h1>{{ pagename|title }}</h1>
<ul>
{% for author in authors %}
  <li{% if loop.first%} class="first"{% endif %}>
    {{ author }}
  </li>
{% else %}
  <li>There are no authors.</li>
{% endfor %}
</ul>

var template  = require('swig');
var tmpl = template.compileFile('/path/to/template.html');
tmpl.render({
    pagename: 'awesome people',
    authors: ['Paul', 'Jim', 'Jane']
});

A Node.js and Browser-based JavaScript Template Engine

Reminds me of PHP’s Twig (which would explain the name)

Swig →