app.render(view, [locals], callback)
Returns the rendered HTML of a view via the callback function. It accepts an optional parameter that is an object containing local variables for the view. It is like res.render(), except it cannot send the rendered view to the client on its own.
Think of app.render() as a utility function for generating rendered view strings. Internally res.render() uses app.render() to render views.
The local variable cache is reserved for enabling view cache. Set it to true, if you want to cache view during development; view caching is enabled in production by default.
app.render('email', function(err, html){
// ...
});
app.render('email', { name: 'Tobi' }, function(err, html){
// ...
});
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