gistfile1.md

In your js:

;(function () {
    window.lcms = window.lcms || {}
    window.lcms.initSomething = function (config) {
        doStuffWith(config.var_name)
        $.ajax(config.whatever_url)
    }
}).call(this);

In your html:

{% block scripts %}
{{ block.super }}
<script>
lcms.initSomething({
    var_name: '{{ var_name }}',
    whatever_url: "{% url 'whatever' %}",
})
</script>
{% endblock scripts %}