Answers for "get all memembers of a guild in discord js"

discord.js how to get all guilds

client.on("ready", () => {
    const Guilds = client.guilds.cache.map(guild => guild.id);
    console.log(Guilds);
});

discord.js guildMemberAdd

client.on('guildMemberAdd', (guildMemberAdd) => {
    //Your code
});

//Note, you have to define client.
//Its best to run these events through something called a "event handler"