Multiple MongoDB Connections using NodeJS - Kevin Uriel Fonseca

Pretty late but this might help someone. The current answers assumes you are using the same file for your connections and models.

In real life, there is a high chance that you are splitting your models into different files. You can use something like this in your main file:

mongoose.connect('mongodb://localhost/default');

const db = mongoose.connection;

db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', () => {
  console.log('connected');
});

which is just how it is described in the docs. And then in your model files, do something like the following:

import mongoose, { Schema } from 'mongoose';

const userInfoSchema = new Schema({
  createdAt: {
    type: Date,
    required: true,
    default: new Date(),
  },
  // ...other fields
});

const myDB = mongoose.connection.useDb('myDB');

const UserInfo = myDB.model('userInfo', userInfoSchema);

export default UserInfo;

Where myDB is your database name.

Sources:

https://mongoosejs.com/docs/connections.html#multiple_connections

https://stackoverflow.com/questions/19474712/mongoose-and-multiple-database-in-single-node-js-project

If you want to know more about Web Development with NodeJS, please take a look into this book:

Bye bye 🙂

If you want to know more about Web Development with NodeJS, take a look into this book: