promiseall.js

import fetch from 'node-fetch'

usersList = ['user1', 'user2', ...'usern']

let userRequests = []
Object.values(usersList).forEach((user) => {
  userRequests.push(getEachUser(user))
})

function getEachUser(user) {
  return new Promise((resolve, reject) => {
    const url = 'https://api.github.com/users/' + user
    fetch(url, {
      method: 'GET',
      headers: {},
    }).then((response) => resolve([response.status, user]))
  })
}

await Promise.all(userRequests).then((responseData) => {
  responseData.forEach((element) => {
    const statusCode = element[0]
    const user = element[1]
    assert.equal(statusCode, 200, 'API call failed for user ' + user)
  })
})