MongoDB Connection Error

I'm having issues connecting my Express App to Mongoose. After I type npm start nodemon mtmarket in the terminal I get error messages -connection error { MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017] at Pool.<anonymous> (C:\mtmarket\node_modules\mongodb-core\lib\topologies\server.js:505:11)

The path to my project is /mtmarket.

The path to the Mongdb bin is /Program Files/MongoDB/Server/3.4/bin

I've installed mongoose in my project and run mongod in a separate terminal from the bin. The terminal says MongoDB starts and then it automatically ends.

2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] MongoDB starting : pid=1348 port=27017 dbpath=C:\data\db\ 64-bit host=Owner-VAIO 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] targetMinOS: Windows 7/Windows Server 2008 R2 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] db version v3.4.15.50-g26706cb04d 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] git version: 26706cb04de995a2d7252da936ba815217239a60 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.2o-fips 27 Mar 2018 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] allocator: tcmalloc 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] modules: non 2018-06-18T08:21:31.485-0700 I CONTROL [initlisten] build environment: 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] distmod: 2008plus-ssl 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] distarch: x86_64 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] target_arch: x86_64 2018-06-18T08:21:31.485-0700 I CONTROL [initandlisten] options: {} 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] exception in initAndListen: 29 Data directory C:\data\db\ not found., terminating

2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] shutdown: going to close listening sockets... 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] shutdown: going to flush dialog... 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] now exiting 2018-06-18T08:21:31.484-0700 I CONTROL [initandlisten] shutting down with code:100

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var mongoose = require('mongoose');

var index = require('./routes/index');



var app = express();

//mongoose connect'
mongoose.connect("mongodb://localhost:27017/market");
var db = mongoose.connection;

db.on('error', console.error.bind(console, 'connection error:'));




// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', index);
app.use('/register', index);



// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

Thank you for your help.