Specifying a port in MongoDB URI does not allow me to connect to my local DB

Question

I am testing a connection to a local DB using mongoose and mongodb. Whenever I specify a port when passing in the URI to mongoose.connect() I get a connection refused error,

async function connectDB() {
    const db = await mongoose.connect('mongodb://localhost:<PORT NR>/myCollection')
    return db
}

However, the connection works whenever I do not specify a port number.

async function connectDB() {
    const db = await mongoose.connect('mongodb://localhost/myCollection')
    return db
}

Why is this the case? I have used the port numbers: 3000,3232,27017 and 3456. All of which to my knowledge are not in use.

Answer 1

If you are running mongo in default port then you can try to connect in below way

function connectMongoDB() {
    let uri = "mongodb://localhost:27017/<db_name>?authSource=admin&ssl=false";
    mongoose.connect(uri, { useUnifiedTopology: true, useNewUrlParser: true });

    const connection = mongoose.connection;

    connection.once("open", function() {
        console.log("MongoDB database connection established successfully");
    }); 
}