Right now, I'm trying to convert a object to a json, but the object has methods in it.

One common solution I've found is storing the function in the json, but that wouldn't work for me (mainly because that would totally break updating)

I think it will be easier to reinitialize the function every time the program is reloaded. What would be the best way to exclude functions when stringifying to json, but including the functions when the json is parsed?

Extra note: some of the functions are stored in arrays and other objects

Edit: Current code to load json data:

var loadData = JSON.parse(window.localStorage.getItem("slotAuto"));
G = {
    ...G,
    ...loadData
};

Current code to save json data:

var toSave = JSON.stringify(G, G.ReplaceNull);
console.log(toSave);
window.localStorage.setItem("saveGame", toSave);

Replace Null function:

if (value == null) {
    return undefined;
};
return value

Example object:

{
    functionList: [function () {
        console.log("do something")
    }]
}

Example output:

{
    "functionList": [null]
}