basic.js

async function getItem (id) {

  var response = await fetch('/api/items/' + id)

  var item = await response.json()

  return item
}

async function taskOnItems (itemIds) {

  const itemTasks = itemIds.map((id) => {

    return getItem(id)
  })

  const items = await Promise.all(itemTasks)

  //All items retrieved
  items.forEach((item) => {
  
      console.log('Item: ' + item.name)
  })
}