To show databases, you can use admin.listDatabases() method to get the name of all the databases where admin represents the admin class.

MongoClient.connect(url, function(error, client) {
   // Use the admin database for the operation
   const adminDb = client.db(''myDb'').admin();
   // List all the available databases
   adminDb.listDatabases(function(err, dbs) {
      console.log(dbs);
   });
});

Example

Try the following example to connect to a MongoDB server −

Copy and paste the following example as mongodb_example.js −

const MongoClient = require(''mongodb'').MongoClient;
// Prepare URL
const url = "mongodb://localhost:27017/";
// make a connection to the database
MongoClient.connect(url, function(error, client) {
   if (error) throw error;
   console.log("Connected!");
   // Use the admin database for the operation
   const adminDb = client.db(''myDb'').admin();
   // List all the available databases
   adminDb.listDatabases(function(err, dbs) {
      console.log(dbs);
   });
   // close the connection
   client.close();
});

Output

Execute the mysql_example.js script using node and verify the output.

node mongodb_example.js
Connected!
{
  databases: [
    { name: ''admin'', sizeOnDisk: 40960, empty: false },
    { name: ''config'', sizeOnDisk: 36864, empty: false },
    { name: ''local'', sizeOnDisk: 73728, empty: false }
  ],
  totalSize: 151552,
  ok: 1
}