something-better.js

Something
  .findOne({
    where: {
      id: somethingId
    }
  })
  .then(function(something) {
    throw new Error('something not found');

    return doSomethingCool();
  })
  .then(function(resultOfSomethingCool) {
    return res.ok(resultOfSomethingCool);
  })
  .catch(function(err) {
    if (err.message === 'something not found') {
      return res.notFound({
        message: 'Something is not found'
      })
    }

    return res.serverError();
  });