account/db.js

const mongoist = require('mongoist');
const config = require('./config.json');
const user_database_collection_name = 'users';
const database = config.mongo.database
const hostname = config.mongo.hostname
const port     = config.mongo.port
const auth     = config.mongo.authentication

let connection_string = '';

if(config.mongo.use_authentication) {
    connection_string = `mongodb://${auth.username}:${auth.password}@${hostname}:${port}/\
        ${user_database_name}?authSource=${auth.authentication_database}` 
}else {
    connection_string = `mongodb://${hostname}:${port}/${user_database_name}`
}

user_database = mongoist(connection_string);
user_collection = user_database.collection(user_database_collection_name);

module.exports = {
    user_database: user_database,
    user_collection: user_collection
};