Nunjucks is a powerful templating engine for JavaScript, inspired by Jinja2. It is designed to be fast, extendable, and easy to use, making it suitable for both server-side and client-side applications.
Template Rendering
Nunjucks allows you to render templates with dynamic data. In this example, the template 'Hello {{ name }}!' is rendered with the context { name: 'World' }, resulting in 'Hello World!'.
const nunjucks = require('nunjucks');
nunjucks.configure({ autoescape: true });
const renderedString = nunjucks.renderString('Hello {{ name }}!', { name: 'World' });
console.log(renderedString);Template Inheritance
Nunjucks supports template inheritance, allowing you to create a base template and extend it in other templates. This example shows a base template 'base.html' and an extending template 'index.html'. The rendered output will have the title 'Home' and the content 'Welcome to the homepage!'.
const nunjucks = require('nunjucks');
nunjucks.configure('views');
// base.html
// <html>
// <head><title>{% block title %}Default Title{% endblock %}</title></head>
// <body>{% block content %}{% endblock %}</body>
// </html>
// index.html
// {% extends 'base.html' %}
// {% block title %}Home{% endblock %}
// {% block content %}Welcome to the homepage!{% endblock %}
const renderedString = nunjucks.render('index.html');
console.log(renderedString);Custom Filters
Nunjucks allows you to create custom filters to manipulate data within templates. In this example, a custom filter 'shorten' is created to truncate a string to a specified length. The template 'Result: {{ message | shorten(7) }}' will render as 'Result: Hello, ' when provided with the context { message: 'Hello, World!' }.
const nunjucks = require('nunjucks');
nunjucks.configure();
nunjucks.addFilter('shorten', function(str, count) {
return str.slice(0, count || 5);
});
const renderedString = nunjucks.renderString('Result: {{ message | shorten(7) }}', { message: 'Hello, World!' });
console.log(renderedString);Handlebars is another popular templating engine for JavaScript. It uses a similar syntax to Nunjucks but is more focused on simplicity and logic-less templates. Handlebars is known for its ease of use and integration with various frameworks.
EJS (Embedded JavaScript) is a templating engine that allows you to generate HTML with plain JavaScript. It is less feature-rich compared to Nunjucks but is very straightforward and easy to use, making it a good choice for simple templating needs.
Pug, formerly known as Jade, is a high-performance template engine heavily influenced by Haml. It uses indentation-based syntax, which can be more concise but also has a steeper learning curve compared to Nunjucks. Pug is known for its clean and readable templates.
h1. Nunjucks
I'm tired of the lack of good templating systems for large js apps. The biggest missing feature between all of them is template inheritance, something necessary for a non-trivial site. Other problems is the ugliness of embedding javascript, too much logic in templates, etc.
I hope that Nunjucks can be better. It is heavily jinja2 inspired because I think it is a great solution for templating. Nunjucks does not claim to be a direct port of jinja2, but most things will work the same in both projects.
h2. Using
Here is an example template that works with the current code:
bc.. {# base.html #}
{{ title }} {% block content %}{% endblock %}{# index.html, inherits base.html #} {% extends "base.html" %}
{% block content %}
{# Variables and filters #} Hello {{ name|title }}!
{# Call a function #} {{ messages() }}
{# Conditionals #}
{% if sick %}
no
{% elif throwing %}
THROWING UP?!
{% elif pooping %}
STOP POOPING
{% else %}
GOOD!
{% endif %}
{# For iteration #}
Let's print some numbers:
{% endblock %}
p. To compile templates, you can create a Template directly or load one from an environment object. Right now the environment just loads the template from the disk relative to the current location.
bc.. var e = require('./environment'); var tmpl = new e.Template('Hello {{ username }}'); console.log(tmpl.render({ username: "james" }));
// From an environment var env = new e.Environment(); var tmpl = env.get_template('test.html'); console.log(tmpl.render({ username: "james" }));
h2. Express
To integrate with express, do the following (this will change before the first release):
bc.. var env = require('/environment'); var loaders = require('/loaders'); var express = require('express');
var e = new env.Environment(new loaders.FileSystemLoader('templates')); app.engine('html', e.express());
h2. Status
This is very close to a 0.1 beta release. It is mostly feature-complete with all the basic stuff ported from Jinja. There are a few things left:
FAQs
A powerful templating engine with inheritance, asynchronous control, and more (jinja2 inspired)
The npm package nunjucks receives a total of 934,199 weekly downloads. As such, nunjucks popularity was classified as popular.
We found that nunjucks demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 5 open source maintainers collaborating on the project.
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