[Controller Example for ExpressJS] Before we define our routes, we'll first create all the dummy/skeleton callback functions that they will invoke. The callbacks will be stored in separate "controller" modules for Books, BookInstances, Genres, and Authors (you can use any file/module structure, but this seems an appropriate granularity for this …

authorController.js

// get author model
var Author = require('../models/author');

// Display list of all Authors.
exports.author_list = function(req, res) {
    res.send('NOT IMPLEMENTED: Author list');
};

// Display detail page for a specific Author.
exports.author_detail = function(req, res) {
    res.send('NOT IMPLEMENTED: Author detail: ' + req.params.id);
};

// Display Author create form on GET.
exports.author_create_get = function(req, res) {
    res.send('NOT IMPLEMENTED: Author create GET');
};

// Handle Author create on POST.
exports.author_create_post = function(req, res) {
    res.send('NOT IMPLEMENTED: Author create POST');
};

// Display Author delete form on GET.
exports.author_delete_get = function(req, res) {
    res.send('NOT IMPLEMENTED: Author delete GET');
};

// Handle Author delete on POST.
exports.author_delete_post = function(req, res) {
    res.send('NOT IMPLEMENTED: Author delete POST');
};

// Display Author update form on GET.
exports.author_update_get = function(req, res) {
    res.send('NOT IMPLEMENTED: Author update GET');
};

// Handle Author update on POST.
exports.author_update_post = function(req, res) {
    res.send('NOT IMPLEMENTED: Author update POST');
};