Polarcraft/web/server/api/minecraft/refreshusername.js

import { applyUsername } from "~/server/utils/auth";

export default defineEventHandler(async (event) => {
  const user = await getAuth(event)

  if (!auth.minecraft.uuid) throw createError({ errorCode: 400, statusMessage: 'Geen Minecraft account is gekoppeld' })
  
  const minecraftProfile = await $fetch(`https://sessionserver.mojang.com/session/minecraft/profile/${user.minecraft.uuid}`)

  const usersColl = db.collection('users')
  const newUser = await usersColl.findOneAndUpdate({ 'minecraft.uuid': auth.minecraft.uuid }, { $set: { 'minecraft.username': minecraftProfile.name, username: user.useMinecraftUsername ? minecraftProfile.name : user.discord.username  } }, { returnDocument: 'after' })

  applyUsername(newUser.value)
  
  return newUser.value
});