How to List All Databases in the Mongo Shell?

For database list:

show databases
show dbs

For table/collection list:

show collections
show tables
db.getCollectionNames()

For MongoDB shell version 3.0.5 insert the following command in the shell:

db.adminCommand('listDatabases')

or alternatively:

db.getMongo().getDBNames()

From the command line issue

mongo --quiet --eval  "printjson(db.adminCommand('listDatabases'))"

which gives output

{
    "databases" : [
        {
            "name" : "admin",
            "sizeOnDisk" : 978944,
            "empty" : false
        },
        {
            "name" : "local",
            "sizeOnDisk" : 77824,
            "empty" : false
        },
        {
            "name" : "meteor",
            "sizeOnDisk" : 778240,
            "empty" : false
        }
    ],
    "totalSize" : 1835008,
    "ok" : 1
}

To list mongodb database on shell

 show databases     //Print a list of all available databases.
 show dbs   // Print a list of all databases on the server.

Few more basic commands

use <db>    // Switch current database to <db>. The mongo shell variable db is set to the current database.
show collections    //Print a list of all collections for current database.
show users  //Print a list of users for current database.
show roles  //Print a list of all roles, both user-defined and built-in, for the current database.

Couple of commands are there to list all dbs in MongoDB shell.

first , launch Mongodb shell using 'mongo' command.

mongo

Then use any of the below commands to list all the DBs.

• show dbs
• show databases
• db.adminCommand( { listDatabases: 1 , nameOnly : true} )

For more details please check here

Thank you.

I have found one solution, where admin()/others didn't worked.

const { promisify } = require('util');
const exec = promisify(require('child_process').exec)
async function test() {
  var res = await exec('mongo  --eval "db.adminCommand( { listDatabases: 1 }         
)" --quiet')
  return { res }
}

test()
  .then(resp => {
    console.log('All dbs', JSON.parse(resp.res.stdout).databases)
  })
test()

According to MongoDB official document, for MongoDB 4+, you can list database name only by running db.adminCommand( { listDatabases: 1, , nameOnly: true } ) against the admin database.

If you are using MongoDB Cloud, you need to connect to your MongoDB deployment first. In that case, you can run this command mongosh "mongodb+srv://cluster0.<your-connection-string>.mongodb.net" --apiVersion 1 --username <your-user-name> in your terminal.

Atlas atlas-xxxxxx-shard-0 [primary] test> db.adminCommand({listDatabases:1 , nameOnly: true})
{
  databases: [
    { name: 'sample_airbnb' },
    { name: 'sample_analytics' },
    { name: 'sample_geospatial' },
    { name: 'sample_guides' },
    { name: 'sample_mflix' },
    { name: 'sample_restaurants' },
    { name: 'sample_supplies' },
    { name: 'sample_training' },
    { name: 'sample_weatherdata' },
    { name: 'admin' },
    { name: 'local' }
  ],
  ok: 1,
  '$clusterTime': {
    clusterTime: Timestamp({ t: xxxxxxxxxx, i: 1 }),
    signature: {
      hash: Binary(Buffer.from("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", "hex"), 0),
      keyId: Long("xxxxxxxxxxxxx")
    }
  },
  operationTime: Timestamp({ t: xxxxxxxxxx, i: 1 })
}