List all users and roles in MongoDB

listAllMongoDBUsers.js

// The following MongoDB script displays all users and roles for all databases.
// Appropriate permissions are required to run this script
use admin

// Increase the number of documents returned by the find command
// Use either the legacy mongo shell version or Mongosh version 
// Legacy Mongo Shell version
DBQuery.shellBatchSize = 300

// Mongosh version
config.set("displayBatchSize", 300)

// Display all users, along with their databases and roles
db.system.users.find({},{db:1,user:1,roles:1});