Lazy8244

So, I am trying to figure out how to whitelist a server. I'm running into a problem where I can not find a reference to formatting, and because I've got an issue with server initialization on top, I'm trying to wing this part until i get the server sorted properly. Does anyone have a basic "form" of whitelist? Is it Minecraft-ish (json file)? 7Days-ish (serveradmin file)? Ark-ish (unholy mess)? ProjectZomboid-ish(text file)? Thankyou, from the worst server admin ever