Users vs. GuildMembers in Discord.js: What's the Difference?

Understanding the Distinction between Users and GuildMembers in Discord.js

When working with Discord.js, it's essential to comprehend the key difference between Users and GuildMembers. This distinction lies at the heart of common errors that arise from mix-ups between these two entities within code.

A User represents a global Discord user, while a GuildMember signifies a Discord user within a specific server. This fundamental distinction underscores the fact that only GuildMembers possess the ability to hold permissions, roles, and nicknames specific to each server.

For instance, trying to invoke GuildMember-specific methods, such as .kick() or .ban(), on a global User object will result in errors. This is because these functions pertain only to server-bound information and cannot be applied generally to all Discord users.

To avoid this issue, it's crucial to ensure you're working with the correct type of entity. One workaround is to utilize the MessageMentions.members collection instead of MessageMentions.users, which will provide GuildMembers rather than global Users.

Another approach involves using the Guild.member() method, which accepts either a User object or an ID. This allows you to seamlessly convert a User to a GuildMember.

const user = client.user;
const guild = client.guilds.cache.get('Guild ID');

const member = guild.member(user); // Convert User to GuildMember

Understanding the difference between Users and GuildMembers empowers you to correctly initialize member-specific properties and methods. For instance, GuildMember.tag does not exist, but GuildMember.user.tag does, allowing you to access this essential information.

Remember that certain event parameters within Discord.js pass Users instead of GuildMembers. These events include messageReactionAdd(), guildBanAdd(), and typingStart(). Therefore, it's essential to be aware of these nuances when developing your code.

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