A script to list all the collections and document count for a specific mongodb db

mongo-ls.js

// Usage: mongo {Server without mongodb:// example 127.0.0.1:27017}/{DbName} [-u {Username}] [-p {Password}] < ./mongo-ls.js

var collections = db.getCollectionNames();

print('Collections inside the db:');
for(var i = 0; i < collections.length; i++){
  var name = collections[i];

  if(name.substr(0, 6) != 'system')
    print(name + ' - ' + db[name].count() + ' records');
}

Use db.listCollections() instead of db.getCollectionNames(),
getCollectionNames() is deprecated

A script to list all the collections and document count for all mongodb databases

var alldbs = db.getMongo().getDBNames();
for(var j = 0; j < alldbs.length; j++)
{
    var db = db.getSiblingDB(alldbs[j]);
    var collections = db.getCollectionNames();
    for(var i = 0; i < collections.length; i++){
      var name = collections[i];
      if(name.substr(0, 6) != 'system'){
          var c = db.getCollection(name).count() ;
          print(db + '  ' + name + '    ' + c );
      }
    }
}

A compact way to list all Documents in all collections

db.getCollectionNames().forEach(coll => print(coll," ",db.getCollection(coll).count()))

// The current database to use.
use("DB_NAME");

const collections = db.getCollectionNames().sort();

for (const collection of collections) {
  const count = db.getCollection(collection).count();

  console.log(`${collection}: ${count}`);
}