How to return the array after altering it back into json format? - node.js

Question

I am making a discord bot where you can use the command tcp freeitem to obtain your free item.
I am trying to alter that value of an Account by adding a new item object into the account. When I map the array to replace a value, it erases the name (allAccounts) of the array of the json. More information below. Here is what I have:
const listOfAllItemNames = require(`C:/Users///censored///OneDrive/Desktop/discord bot/itemsDataList.json`)
const accountList = require(`C:/Users///censored///OneDrive/Desktop/discord bot/account.json`)
const fs = require('fs')
var accountThatWantsFreeItem = accountList.allAccounts.find(user => message.author.id === user.userId);
var randomFreeItem = listOfAllItemNames.allItems[Math.floor(Math.random() * listOfAllItemNames.allItems.length)]
if(accountThatWantsFreeItem === undefined) {message.reply('You need to make an account with tcp create!'); return; }
if(accountThatWantsFreeItem.freeItem === true) {message.reply('You already got your free one item!'); return;}
fs.readFile('C:/Users///censored///OneDrive/Desktop/discord bot/account.json', 'utf8', function readFileCallback(err,data) {
if(err){
console.error(err)
} else {
var accountsArray = JSON.parse(data)
console.log(accountsArray)
var whoSentCommand = accountsArray.allAccounts.find(user => message.author.id === user.userId)
whoSentCommand.Items.push(randomFreeItem)
whoSentCommand.freeItem = true;
var test = accountsArray.allAccounts.map(obj => whoSentCommand === obj.id || obj)
//I believe the issue is trying to map it returns a new array
console.log(test)
test = JSON.stringify(test, null, 5)
//fs.writeFile('C:/Users///censored///OneDrive/Desktop/discord bot/account.json', test, err =>{ console.error(err)} )
}
})
when I write the file back to json file, it removes the "allAccounts" identifier in this file
//json file
//array name "allAccounts" is removed, I need this still here for code to work
{
"allAccounts" : [
{
"userId": "182326315813306368",
"username": "serendipity",
"balanceInHand": 0,
"balanceInBank": 0,
"freeItem": false,
"Items": []
},
(No "allAccounts" array name)
to this: output after writing file
So, the final question is
How would I alter the array so that I only alter the account I want without editing the array name?
Please feel free to ask any questions if I was unclear.

Answer 1

Array.map() method returns the converted array.
So in the below line, map() method takes allAccounts array and perform actions and put the target array (not object) to the test variable.
var test = accountsArray.allAccounts.map(obj => whoSentCommand === obj.id || obj)
So for making code works, please change the code like this:
var test = {
"accountsArray": accountsArray.allAccounts.map(obj => whoSentCommand === obj.id || obj)
}

Answer 2

When posting questions, please please reduce the code to a minimal example that will demonstrate the problem, and use words, not code, to describe the problem.
It looks like you are expecting .map to do something other than what it does.
Please consult the documentation for Array.map().
It takes the array that you pass it (in this case accountsArray.allAccounts) and transforms it, returning the transformed array.
You have essentially done test = accountsArray.allAccounts but for some reason are expecting test to contain an Object with the key allAccounts, when in fact it will only contain an Array, because that is what you have assigned it.