node.js - Cannot connect heroku to mongolabs database -

i new dev , have no idea doing in regards deploying app. locally, can run perfectly. have setup heroku account , mongolabs account. app.js file starts app, , have set in heroku , when heroku logs shows attemps start crashes when cant find mongodb. have code wrong, lost , don't know find answer. have been looking hours. username , password swapped below use correct credentials when trying send file.

my app.js file is:

var express = require('express'); var app = express(); var mongodb = require('mongodb'); var reddit = require('./routes/reddit'); var enter = require('./routes/enter'); var user = require('./routes/user'); var update = require('./routes/update'); var message = require('./routes/message'); var register = require('./routes/register'); var login = require('./routes/login'); var rate = require('./routes/rate'); var credentials = require ('./routes/request-credentials'); var uri = 'mongodb://removed:removed@ds045734.mongolab.com:45734/bubsta'; mongodb.mongoclient.connect(uri, function(err, db){     if(err) throw err; });  app.use('/', reddit); app.use('/user', user); app.use('/enter', enter); app.use('/update', update); app.use('/login', login); app.use('/message', message); app.use('/register', register); app.use('/rate', rate); app.use('/credentials', credentials); app.use(express.static('public/dist')); app.use(express.static('public/js')); app.use(express.static('public/dist/images')); app.use(express.static('bower_components'));  app.listen(1337); console.log('started on server 1337'); 

the file creates schema , connects follows. have commented out old code works locally, including see had connected , why assume supposed put new code here.

var mongoose = require('mongoose'); var schema = mongoose.schema;  // mongoose.connect('mongodb://localhost:27017/users/mike/project-two/users'); mongoose.connect('mongodb://removed:removed@ds045734.mongolab.com:45734/bubsta');  var user = new schema({     name: { type: string, index: { unique: true }},     password: string,     email: string,     positive: number,     negative: number,     points: number,     title: string,     sessions: number,     roomfull: boolean });  module.exports = mongoose.model('user', user); 

if me write correct code, or point me in right direction documentation explains how set file can use mongolabs heroku appreciative.

i able solve it. needed use:

var mongouri = process.env.mongolab_uri  mongo.connect(mongouri, function(err, db){     if (err){         console.log(err);     }else{         console.log('success');     }; });  app.listen(process.env.port || 1337); 

then mongoose connection needed:

mongoose.connect('mongodb://heroku_somecodeherebutnotthisonec@ds048704.mongolab.com:48704/heroku_3rjmclqw');