EDIT: I have confirmed that the username/UUID listed here matches what I put in the whitelist json file. I've restarted the server. I've logged in to other servers (e.g. Hypixel) to test my new account. Has whitelisting changed to make the only way for it to work is to have one of the kids with an admin account add me from the in-game console?. whitelist.json is a server configuration file that stores the usernames of players who have been whitelisted on a server. This file is only used on multiplayer servers.
Generate whitelist.json for your Minecraft server. Enter player usernames, auto-fetch UUIDs, and download ready-to-use whitelist files. Free whitelist generator tool.. Paste a list of Minecraft usernames. We look up each UUID via the official Mojang API and generate the exact whitelist.json or ops.json file your server needs.