Error: getaddrinfo EAI_AGAIN undefined (ldapjs) - express

Question

So, i tried to deploy my Express.Js app to my vps, but I get some error that refined to Error: getaddrinfo EAI_AGAIN undefined. The weird part is, it is doing just fine if I run this app on my localhost. Any body knows how to resolve this issue?
Here are the error log that I get.
events.js:187
throw er; // Unhandled 'error' event
^
Error: getaddrinfo EAI_AGAIN undefined
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:60:26)
Emitted 'error' event on Client instance at:
at Backoff.<anonymous> (/home/user/deploy-folder/app-api/node_modules/ldapjs/lib/client/client.js:1228:12)
at Backoff.emit (events.js:210:5)
at Backoff.backoff (/home/user/deploy-folder/app-api/node_modules/ldapjs/node_modules/backoff/lib/backoff.js:41:14)
at /home/user/deploy-folder/app-api/node_modules/ldapjs/lib/client/client.js:1214:15
at f (/home/user/deploy-folder/app-api/node_modules/ldapjs/node_modules/once/once.js:25:25)
at Socket.onResult (/home/user/deploy-folder/app-api/node_modules/ldapjs/lib/client/client.js:1016:7)
at Object.onceWrapper (events.js:300:26)
at Socket.emit (events.js:210:5)
at emitErrorNT (internal/streams/destroy.js:92:8)
at emitErrorAndCloseNT (internal/streams/destroy.js:60:3) {
errno: 'EAI_AGAIN',
code: 'EAI_AGAIN',
syscall: 'getaddrinfo',
hostname: 'undefined'

Answer 1

I assume that by now you discovered the error, but in this particular case it seems that the variable you are using to setup ldap is not stated or resolves to undefined.
The proper way to do it according to the documentation is this:
var ldap = require('ldapjs');
var client = ldap.createClient({
url: 'ldap://127.0.0.1:1389'
});