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// Async context needed for 'await' (meaning this must be within an async function).
// Assuming 'message' is a Message within the guild.
try {
const banList = await message.guild.fetchBans();
const bannedUser = banList.find(user => user.id === 'someID');
if (bannedUser) await message.channel.send(`${bannedUser.tag} is banned.`);
else await message.channel.send('That user is not banned.');
} catch(err) {
console.error(err);
}
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// Async context needed for 'await' (meaning this must be within an async function).
// Assuming 'message' is a Message within the guild.
let discordUser = client.users.cache.find(user => user.id === "User id here"])
let bannedMember = (await message.guild.bans.fetch()).get("User id here");
if (!discordUser) return message.reply("Invalid user.");
if (!bannedMember) return message.reply("The specified member is not banned from the server.");
message.reply("The specified user is banned from the server")