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View-specific helpers

While defining helpers globally is nice because they are available to every view that's rendered, sometimes you might only need to define a helper for use within a single view. In this case, you can include the helper right with the ViewModel itself when calling res.render(), as shown in the following code:

var viewModel = {
  name: 'Jason',
helpers: {
    timeago: function(timestamp) {
   return 'a long time ago!';
         }
}
};
res.render('index', viewModel); 

From

Cover of Web Development with MongoDB and Node.js

Note

Handlebars - view specific helpers