Could not connect with MongoLab database URl using node.js and Heroku

Question

I could not connect to MongoDB which is present in MongoLAB . I have one MEAN app and I have deployed in heroku. When I am trying to connect with database but could not. The logs are given below.

Disconnected from log stream. There may be events happening that you do not see here! Attempting to reconnect...

2017-07-31T11:46:48.243603+00:00 app[web.1]:     at module.exports (/app/node_modules/mongodb/lib/url_parser.js:59:13)

2017-07-31T11:46:48.243605+00:00 app[web.1]:     at Function.MongoClient.connect (/app/node_modules/mongodb/lib/mongo_client.js:113:3)

2017-07-31T11:46:48.243604+00:00 app[web.1]:     at connect (/app/node_modules/mongodb/lib/mongo_client.js:289:16)

2017-07-31T11:46:48.243606+00:00 app[web.1]:     at run (/app/node_modules/thunky/index.js:13:3)

2017-07-31T11:46:48.243606+00:00 app[web.1]:     at /app/node_modules/mongojs/lib/database.js:29:15

2017-07-31T11:46:48.243607+00:00 app[web.1]:     at Collection._getConnection (/app/node_modules/thunky/index.js:27:3)

2017-07-31T11:46:48.243608+00:00 app[web.1]:     at Collection._getCollection (/app/node_modules/mongojs/lib/collection.js:17:10)

2017-07-31T11:46:48.243609+00:00 app[web.1]:     at getCursor (/app/node_modules/mongojs/lib/collection.js:32:10)

2017-07-31T11:46:48.243610+00:00 app[web.1]:     at run (/app/node_modules/thunky/index.js:13:3)

2017-07-31T11:46:48.243609+00:00 app[web.1]:     at /app/node_modules/mongojs/lib/cursor.js:12:5

2017-07-31T11:46:48.244240+00:00 app[web.1]: [0mPOST /login [31m500 [0m30.134 ms - 22[0m

Disconnected from log stream. There may be events happening that you do not see here! Attempting to reconnect...

My code is below:

var mongoJs=require('mongojs');
var CryptoJS = require("crypto-js");
var database='FGDP';
var collections=['f_users'];
var MONGOLAB_URI="mongodb://username:password@ds127153.mlab.com:27153/fgdp";
var db=mongoJs(MONGOLAB_URI, collections);
var ses;
exports.userlogin=function(req,res){
    var username=req.body.user_name;
    var password=req.body.user_pass;
   // console.log('pass'+typeof(password));
    //var ciphertext = CryptoJS.AES.encrypt(password, 'lexelPass');
    //var pass=ciphertext.toString();
    db.f_users.findOne({'login_name':username},function(err,docs){
        console.log('err',err);
        if(!err){
            if(docs){
                var pass=docs.password;
                var bytes = CryptoJS.AES.decrypt(pass.toString(), 'lexelPass');
                var plaintext = bytes.toString(CryptoJS.enc.Utf8);
                if(plaintext==password){
                   req.session.email=docs.email;
                   req.session.name=docs.name;
                   req.session.login_name=docs.login_name;
                   req.session.status=docs.status;
                   req.session.user_type=docs.user_type;
                   res.send(docs); 
                }else{
                   res.send("Login failed");
                }
            }
        }
        if(err){
            res.send("Login failed");
        }
    })
}

That database and collection is present in mongoLAB. I need to connect it through mongojs. Actally I have a login App and I could not login.

Answer 1

You should do like

var db = mongoJs(MONGOLAB_URI);
db.on('connect', function () {
    console.log('database connected')
});