var mongoose=require('mongoose');
var config=require('./config/database');

const user = config.mongoUser;
const pass = config.mongoPass;
const host = config.mongoHost;
const port = config.mongoPort;

let uri = `mongodb://${user}:${pass}@${host}:${port}`;
if (config.mongoDatabase) {
 uri = `${uri}/${config.mongoDatabase}`;
}
console.log(uri);

mongoose.connect(uri,{useMongoClient:true});

Error: listen EADDRINUSE :::1111
at Object._errnoException (util.js:1003:13)
at _exceptionWithHostPort (util.js:1024:20)
at Server.setupListenHandle [as _listen2] (net.js:1353:14)
at listenInCluster (net.js:1394:12)
at Server.listen (net.js:1482:7)
at Function.listen (/coin_o_pedia/ejb/node_modules/express/lib/application.js:618:24)
at Object.<anonymous> (/coin_o_pedia/ejb/app.js:167:16)
at Module._compile (module.js:662:30)
at Object.Module._extensions..js (module.js:673:10)
at Module.load (module.js:575:32)
at tryModuleLoad (module.js:515:12)
at Function.Module._load (module.js:507:3)
at Function.Module.runMain (module.js:703:10)
at startup (bootstrap_node.js:193:16)
at bootstrap_node.js:665:3