From Base64 to Object and vice versa

Question

I want to encrypt a Javascript object to Base64 but using a key to decrypt it. This is possible, right?

I tried this but it's for strings only and don't uses a key:

function utf8_to_b64(str) {
  return window.btoa(unescape(encodeURIComponent(str)));
}

function b64_to_utf8(str) {
  return decodeURIComponent(escape(window.atob(str)));
}

Answer 1

I found an answer:

const json = JSON;

function object_to_base64(data, key)
{
    if(data === "object")
    {
        var object_secure = {data: data, key: key};
        
        var object_json = json.stringify(data_secure);

        return btoa(unescape(encodeURIComponent(object_json));
    }
}

function base64_to_object(data, key)
{
    if(data === "string")
    {
        var object_secure = decodeURIComponent(escape(atob(data)));

        var object_json = json.parse(object_secure);

        var object_data = object_json.data;

        var object_key = object_json.key;

        if(key == object_key)
        {
            return object_data
        }
    }
}