Custom Filter confusion

[Christian Gloddy]

I'm attempting to create a custom filter per the instructions here:
http://jlongster.github.io/nunjucks/api#custom-filters

I'm using Nunjucks with Express and wrote the following:

nunjucks.configure('views', {
  autoescape: true,
  express: app,
  watch: true
});

var env = new nunjucks.Environment();
env.addFilter('formatdate', function(str, format) {
  return str;
});

When I try to access a page that uses the filter, I get:

Template render error: Error: filter not found: formatdate

My assumption is that this is because I need to pass that env to Express, but where is the appropriate place to do so?

[James Long]

The higher-level API (nunjucks.configure, etc) internally uses its own
Environment object, so you don't have to create your own. There might
be a way to clarify this in the examples deeper down in the docs. Just
don't create your own Env, and use the one returned by `configure`:

var env = nunjucks.configure('views', { ... });

env.addFilter('foo', function() {});

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[Christian Gloddy]

Perfect! That did the trick. Much thanks.
I simply a Moment.js' formatting abilities via a filter:

env.addFilter('formatdate', function(str, format) {

  return moment(str).format(format);
});

Might be a nice thing to have as one of the built-in filters:
http://momentjs.com