discord.js dm all members
message.guild.members.cache.forEach(member => { // Looping through each member of the guild.
// Trying to send a message to the member.
// This method might fail because of the member's privacy settings, so we're using .catch
member.send("Hello, this is my message!").catch(e => console.error(`Couldn't DM member ${member.user.tag}`));
});