---
title: "Nunjucks"
description: "Nunjucks is a templating language for JavaScript and Node.js from Mozilla, which is relatively similar to Twig in its structure."
canonical_url: "https://codex.republic.se/languages/nunjucks"
section: "Pages"
---

# Nunjucks

[Nunjucks](https://mozilla.github.io/nunjucks/) is a templating language for JavaScript and Node.js from Mozilla, which is relatively similar to [Twig](/languages/twig) in its structure.

---

We use Nunjucks, with the file extension `.njk`, in various applications, including [Eleventy](/cms/eleventy-11ty).

Here is an example of a couple of lines with syntax:

```html
{% extends "base.html" %}

{% block header %}
<h1>{{ title }}</h1>
{% endblock %}

{% block content %}
<ul>
    {% for name, item in items %}
    <li>{{ name }}: {{ item }}</li>
    {% endfor %}
</ul>
{% endblock %}

```