What is the proper method for terminating an Express app.all?

Here's a snippet of my code where I utilize the app.all method. In this scenario, I am invoking the fetchBuildings function based on the building ID or hash provided in the URL. Subsequently, I am assigning values to the title, description, and image properties based on the response received:

app.all('/:id', function (req, res) {
  const hash = req.params.id
  const obj = {}
  if (hash === 'undefined') {
    obj.title = 'iStaging LiveTour'
    obj.description = ''
    obj.image = 'https://raw.githubusercontent.com/alexcheninfo/vue-tmux-example/master/app/istaging.jpg'
    return
  }
  fetchBuildingsByHash(hash).then(({title, description, image, isBasicPlan}) => {
    if (isBasicPlan) {
      obj.title = 'iStaging LiveTour'
      obj.description = ''
      obj.image = 'https://raw.githubusercontent.com/alexcheninfo/vue-tmux-example/master/app/istaging.jpg'
    } else {
      obj.title = title || 'iStaging LiveTour'
      obj.description = description || ''
      obj.image = image || 'https://raw.githubusercontent.com/alexcheninfo/vue-tmux-example/master/app/istaging.jpg'
    }
    res.render('index.ejs', obj)
  }).catch((err) => {
    const obj = {
      title: 'notFound'
    }
    res.render('404.ejs', obj)
  })
});

In certain cases, the value of hash may be 'undefined', prompting me to halt the execution of the code when that condition is met.

Currently, I am using the return statement for this purpose. However, I am curious if there is a more conventional or 'proper' approach to handling this situation. Is there an alternative method that should be considered?

Answer №1

It is crucial to always handle the response properly in your middleware. Failing to do so can cause the request to become stuck, leading to timeouts for the client.

For example, if passing an undefined hash is deemed unacceptable, you can return a 400 error message:

if (hash === 'undefined') {
  return res.sendStatus(400);
}

If you prefer to continue processing the request and let Express handle a potential 404 error, you can simply pass the request along:

app.all('/:id', function (req, res, next) {
  const hash = req.params.id
  const obj = {}
  if (hash === 'undefined') {
    return next();
  }
  ...
})

Alternatively, you can explicitly pass an error, triggering a 500 error response from Express:

if (hash === 'undefined') {
  return next(Error('invalid hash'));
}

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