Connecting to MongoDB using Express - html

Question

I am having trouble understanding what needs to be done in order to connect to MongoDB so i can insert an Object into the database. I am new to using Express as well as MongoDB and don't have a full grasp on the both of them yet.
My app.js which was created using the standard Express setup is as follows.
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 ex_session = require('express-session');
var dateformat = require('dateformat');
var MongoClient = require('mongodb').MongoClient;
var ObjectID = require('mongodb').ObjectID;
var url = 'mongodb://localhost:27017/contacts'
var index = require('./routes/index');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
// 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);
// 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;
My index.js is as follows and what i would like to happen is when a post request is made from /mailer, a connection is made to the MongoDB in order to set up for an insert.
var express = require('express');
var router = express.Router();
var url = 'mongodb://localhost:27017/contacts';
var contacts;
/* GET home page. */
var start = function(req, res, next){
console.log("Starting!");
res.render('mailer',{});
}
router.get('/', start);
router.get('/mailer', start);
/* Post mailer Page insert into database*/
router.post('/mailer', function(req, res, next){
res.render('thanks');
console.log("Welcome to the Thank You Page");
MongoClient.connect(url, function(err, db){
if(err == NULL){
console.log("Connected to database");
// parse the body of the page and set up object to send to the
// database
}
});
});
router.get('/contact', function(req, res){
res.render('contact', {});
})
module.exports = router;

Answer 1

*for express ,
var mongo = require('mongodb');
var MongoClient = mongo.MongoClient;
MongoClient.connect('mongodb://'+DB_USERNAME+':'+DB_PASSWORD+'#'+DB_HOST+':'DB_PORT+'/'+DB_NAME,function(err, db){
if(err)
console.log(err);
else
{
console.log('Mongo Conn....');
}
});
//for local server for express
//in local server DBPASSWOAD and DBusername not required
MongoClient.connect('mongodb://'+DB_HOST+':'+DB_PORT+'/'+DB_NAME,function(err, db){
if(err)
console.log(err);
else
{
console.log('Mongo Conn....');
}
});

Answer 2

Your code is super mess，I can show your my configuration and u can refer to.
db.js
import mongoose from 'mongoose';
export default function connectDB() {
mongoose.Promise = global.Promise;
mongoose.connect('mongodb://localhost:27017/contacts');
mongoose.connection.once('open', function () {
console.log('mongodb connected.');
});
};
app.js
import connectDB from "db.js";
connectDB();
user.model.js
import mongoose from 'mongoose';
const schema = mongoose.Schema({
email: {type: String, required: true},
mobile: {type: String},
password: {type: String, required: true},
});
const User = mongoose.model('User', schema, 'user');
export default User;
then in your router file u can call User.find() or User.update or ...