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Jinja2 to Javascript compiler

Project description

JsJinja: Render Jinja2 Templates in JS

JsJinja lets you use your Jinja2 templates in Javascript. It compile the Jinja2 templates to Javascript with no restrictions.

The js can be generated via command line jsjinja <template file> or through the {% jsjinja %} tag in the templates.

You can use:

  • Template inheritance (Include, Extends, Blocks, super, …)

  • Import

  • Macros

  • Tests

  • Filters

  • Tags

The only exception is that you cannot use custom tags like {% customtag %}{% endcustomtag %}.


First, you must do:

pip install jsjinja


Here a small example of a Jinja template:

{% extends 'base.html' %}
{% block title %}Memberlist{% endblock %}
{% block content %}
  {% for user in users %}
    <li><a href="{{ user.url }}">{{ user.username }}</a></li>
  {% endfor %}
{% endblock %}

And here is the javascript compiled template:

(function() {
    Jinja2.extends(Template, Jinja2.Template);
    Jinja2.registerTemplate("readme_template.tmpl", Template);
    function Template() {return Template.__super__.constructor.apply(this, arguments);};
    Template.prototype.root = function (context) {
        var buf = "";
        var parent_template = Jinja2.getTemplate("base.html", "readme_template.tmpl");
        for (name in parent_template.blocks) {
            var parent_block = parent_template.blocks[name];
            context.blocks[name] = context.blocks[name] || [];
        buf += parent_template.root(context);
        return buf;
    Template.prototype.block_content = function (context) {
        var buf = "";
        var l_users = context.resolve("users");
        buf += "\n  <ul>\n  ";
        var l_user = undefined;
        var t_1 = l_users;
        for (var t_2= 0, t_3 = t_1.length; t_2<t_3; t_2++) {
            l_user = t_1[t_2];
            buf += '\n    <li><a href="';
            buf += l_user['url'];
            buf += '">';
            buf += l_user['username'];
            buf += '</a></li>\n  ';
        l_user = undefined;
        buf += "\n  </ul>\n";
        return buf;
    Template.prototype.block_title = function (context) {
        var buf = "";
        buf += "Memberlist";
        return buf;
    return Template;


For begin using JsJinja just add jsjinja.ext.JsJinjaExtension to your Jinja2 Environment.


import jinja2
env = jinja2.Environment(extensions=['jsjinja.ext.JsJinjaExtension',])




Generating js templates

Once you have the JsJinja extension installed, you have to generate the js templates:

print jinja_env.jsjinja.generate('your_template.jinja2')

Or just converting all

print jinja_env.jsjinja.generate_all()

Or using the command line utility

jsjinja <templates>

Rendering the js templates

For start using the templates you must include the jinja2.runtime.js script:

<script src=""></script>

After you have included jinja2.runtime.js and the generated js templates, then

html = Jinja2.getTemplate("template.html").render({}})


Library comes with a lot of examples, you can find them in examples directory.


You must have pyv8 and nose python packages installed. You can do the tests with




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