Guide on including a sum (integer) property in the JSON output of my API

Currently, I am working on an API using Express.js. In one of my functions named getAll, my goal is to not only return an array of records but also include the total number of records in the response. The code snippet below showcases how I have been handling this so far:

const users = await User.getAll()
const total = users.length
const response = users
return res.json(response).status(200)

The current format of the response looks like [{user1},{user2},{user3}]. My question is: How can I modify it to append the total in the following format?

{ data: {Record[]}, total: {int} }

I attempted the following approach but it ended up adding a key for each user based on their ordinal position within the array.

const users = await User.getAll()
const total = users.length
const response = {
  ...users,
  total
}
return res.json(response).status(200)

Answer №1

let allUsers = await Users.fetchAll();
response.send({ usersData: allUsers, totalUsers: allUsers.length }).status(200);

Answer №2

Utilizing array spreading within an object is shown in this specific line:

const response = {
    ...users,
    total,
}

Attempting to add all elements of the array to an object is not achievable using this method. However, you can utilize the format that was previously suggested:

const response = {
    data: users,
    total: total,
}

return res.json(response).status(200);

Answer №3

...users is the culprit in this scenario. By utilizing the spread operator, you are able to expand an iterable object (in this case, your users). The following code should function as expected:

const users = await User.getAll()
const total = users.length
const response = {
  users,
  total
}
return res.json(response).status(200)

Answer №4

A common problem arises because of the spread operator (...), which expands the user's array in the response object. To address this issue, consider implementing the code snippet below:

const allUsers = await User.getAll()
const count = allUsers.length
const result = {
  users: allUsers,
  count,
}
return res.status(200).json(result)

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