Mongoose.connect doesn't create database if not exist

Question

I'm new on NodeJs, I'm learning how to connect to mongodb using NodeJS with Mongoose library. As I know, when I connect to database with a name, if this database with that name doesn't exist, then mongoose will create it automatically, but it's not being created with me. Here is my code:

const mongoose = require("mongoose");

mongoose.connect("mongodb://127.0.0.1:27017/mongo-test", {useNewUrlParser: true})
.then(() => console.log("Connected"))
.catch(err => console.log(err));

mongoose version: ^5.2.5

Answer 1

Pedro is right, when you save your first document in the database, mongoose will create the database and the collection for this document.

The name of the database will be the name specified in the connection, in this case myapp:

mongoose.connect('mongodb://localhost:27017/myapp');

Mongoose Documentation: Connections

And mongoose creates the collection with a plural name.

If you have a model with Tank name, the collection name will be tanks:

var schema = new mongoose.Schema({ name: 'string', size: 'string' });
var Tank = mongoose.model('Tank', schema);

The first argument is the singular name of the collection your model is for. Mongoose automatically looks for the plural version of your model name. Thus, for the example above, the model Tank is for the tanks collection in the database.

Mongoose Documentation: Model

Answer 2

I'm not 100% sure but you also need to create a record so that it creates the database. Only specifying the database name on the connection string isn't enough apparently.

Cheers