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routes - Discord.js Add Role with Express | Cannot read property 'add' of undefined

app.get('/whitelist/*', function(req, res) {
     var fullUrl = req.originalUrl.replace('/whitelist/', '');
     const userjs = bot.users.cache.get(fullUrl);
     userjs.roles.add('791498271922585614');
});

I want to give a role to a user via Express using the code above, but it doesn't work. I receive the following error:

TypeError: Cannot read property 'add' of undefined

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In order to give a user a role, you'll need to get his GuildMember object.

To do that, you would have to get the Guild object of the guild you're referring to. You could simply do that using:

const guildObject = bot.guilds.cache.get('guild id here');

And finally, you could get the GuildMember object by typing:

const memberObject = guildObject.member(userjs); // AKA the user object you already have

Once that is done with, you can simply add the role using:

memberObject.roles.add('791498271922585614');

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