sort() in Nunjucks is a version of jinja's sort, it takes three parameters:

sort(reverse, case_sensitive, attribute)

• reverse (boolean) sorts descending instead of ascending
• case_sensitive (boolean) will sort upper and lower case strings separately
• attribute (string) the attribute to sort the object by

In my index.njk layout I am sorting collections like so:

collections.post | sort(true, true, 'date')