MongoDb - update user in another database from the root.

grantRolesToUser.js

MongoClient.connect('mongodb://admin:pass@localhost:27017/mydb?authSource=admin').then((db) => {
    return db.command({ 
        grantRolesToUser: 'user',
        roles: ['dbAdmin', 'readWrite']
    })
    .then((stat) => {
        console.log(stat);
    });
})
.catch(console.log);

insert.js

MongoClient.connect('mongodb://user:pass@localhost:27017/mydb').then((db) => {
    console.log('Connected!');
    return db.command({
        usersInfo: 'user',
    })
    .then(({users}) => {
        const user = users[0];
        user.roles.forEach((r) => {
             console.log(r);
        });
    })
    .then(() => {
        return db.collection('people').insertOne({ name: 'bob', age: 20 });
    })
    .then(() => {
        return db.collection('people').find().toArray()
            .then((people) => {
                 console.log(people);
            });
    });
})
.catch(console.log);