LDAPjs makes the LDAP protocol a first class citizen in Node.js.
For full docs, head on over to http://ldapjs.org.
var ldap = ;var server = ldap;server;server;
To run that, assuming you've got the OpenLDAP client on your system:
ldapsearch -H ldap://localhost:1389 -x -b dc=example objectclass=*
npm install ldapjs