Update player data to newest version

Hello! I have been trying to figure out a system in which, if the players’ data is ‘out of date’ a script could take their data and update it. I was curious if it was possible, as in a game I’m working on, if a players’ data is older and missing folders, the game wouldn’t function properly. If you don’t understand what I’m talking about, I’m thinking a system like in ACNH, where it prompts you a screen while your data is being updated.
Also, I’m using dictionaries to store the data.

You can manually iterate through a user’s datastore entries and check to see if that datastore lacks certain keys. If it does, you would add the new data under the key that the datastore lacks.

That would look something like this:

game.Players.PlayerAdded:Connect(function(player)
    local keys = {"your", "essential", "keys", "listed", "here"}
    for index, key in ipairs(keys) do
        if YourDataStoreHere:GetAsync(keys[index]) == nil then
            YourDataStoreHere:SetAsync(key, YourDataHere, player.UserId)
        end
    end
end)

Heads up, you may already know but I’m unsure since you specified that you were working with dictionaries, DataStores store data in a dictionary by default.

Sorry for being vague, when I say dictionaries I mean:

local defDataTable = {
	['tokens'] = "300",
	['ownedBirds'] = {
		
	},
	['gamepasses'] = {
		
	},
	['settings'] = {
		["UIColor"] = {
			["R"] = 0,
			["G"] = 0,
			["B"] = 0
		},
	}

That is what a dictionary is, yes. Are you not using DataStoreService?

Regardless, the principle would be the same with that dictionary too except you wouldn’t be using methods from the GlobalDataStore class.

I’m currently using DataStore2, but it’s not panning out very well. Sorry for the confusion, I’m kinda tired right now. Thanks, though! That’ll help with what I’m trying to do.