var LdapAuth = require('ldapauth');
var options = {
    url: 'ldaps://ldap.example.com:663',
    adminDn: '...'
    
    ...
{
};
var auth = new LdapAuth(options);
...
auth.authenticate(username, password, function(err, user) { ... });
...
auth.close(function(err) { ... })

npm install ldapauth