Why am I unable to connect to MongoDB using NestJS and Mongoose?

Question

I have a nest.js node server and I am trying to connect mongoDB data base in the app.module, when the connection string doesn't contains the DB name - the connection to default DB "test" success, but when I specify the DB name- always getting "Authentication failed" error.

[Nest] 53087 - 11/08/2023, 6:30:46 PM ERROR [MongooseModule] Unable to connect to the database. Retrying (1)...

app.module.ts:

This works:

  imports: [
    MongooseModule.forRoot('mongodb://admin:admin@localhost:30000'),
  ]

But this specifying the DB name failed with Authentication error:

  imports: [
    MongooseModule.forRoot('mongodb://admin:admin@localhost:30000/test'),
  ]

or:

  imports: [
    MongooseModule.forRoot('mongodb://admin:admin@localhost:30000/data'),
  ]

Using MongoClient directly (without nestjs) connecting successfully:

const client = new MongoClient('mongodb://admin:admin@localhost:30000');
await client.connect();
db = client.db('data');

What is the issue?

Answer 1

Specify the DB name as a connection option - not as a part of the connection string solved the problem:

imports: [
    MongooseModule.forRoot({
       uri: 'mongodb://admin:admin@localhost:30000',
       dbName: 'data'
    }),
  ]