JavaScript – Using localStorage to save numbers: how to extract numbers from localStorage

So i have made a web based program and I am using localStorage to save my variables. However I’m running into an issue where i cant get back the numbers from localStorage (as they are a string when saved) is there a way to set the strings back to a number without effecting the rest of the code?

let cardCount = 0;
let card = 0
function DisplayCardCount() {
  cardCount++;
  card++;
  document.getElementById("DisplayCountCard").innerHTML = cardCount;
}

//Counting the cash
let cashCount = 0;
let cash = 0
function DisplayCashCount(){
  //Display Session
  cashCount++;
  //Saving Data to local
  cash++;
  document.getElementById("DisplayCountCash").innerHTML = cashCount;
}

//Get Sell Total Price
let SellTotal = 0;
function DisplaySellTotal(){
  SellTotal++;
  document.getElementById("DisplaySellTotal").innerHTML = SellTotal*5;
  return SellTotal;
}
//Clear all variables (set all varables back to 0)
function Clear(){
  SellTotal = 0;
  cashCount = 0;
  cardCount = 0;
  document.getElementById("DisplayCountCard").innerHTML = 0;
  document.getElementById("DisplayCountCash").innerHTML = 0;
  document.getElementById("DisplaySellTotal").innerHTML = 0;
}
//Save the payment information


let totalSales = 0
let totalCard = 0
let totalCash = 0
let totalSalesCount = 0

function takePayment(){
  //Count the ammount of times Confirm has been pressed
  let Counting = totalSales+=1;
  //Save Array to local Storage
  const SalesArray = [card, cash, Counting]
  localStorage.setItem('Sales',JSON.stringify(SalesArray));
  const SalesData = JSON.parse(localStorage.getItem('Sales'));
  console.log(SalesData);
  //Save Data to local storage for card and cash
  localStorage.setItem('card',JSON(card))
  localStorage.setItem('cash',JSON(cash))

  //Set clear all functions to start again (not effecting local storage)
  SellTotal = 0;
  cashCount = 0;
  cardCount = 0;
  document.getElementById("DisplayCountCard").innerHTML = 0;
  document.getElementById("DisplayCountCash").innerHTML = 0;
  document.getElementById("DisplaySellTotal").innerHTML = 0;
}