express-middleware.js

router.get('/api/users', loadUsers, json)

router.get('/users', loadUsers, render('users/list'))


function loadUsers(req, res, next) {
  User
  .find()
  .limit(10)
  .exec()
  .then(users => {
    res.locals.users = users
    next()
  })
  .catch(next)
}

function json(req, res, next) {
  res.json(res.locals)
}

function render(name) {
  return (req, res, next) => res.render(name)
}