How can I use mongoose in node js?

Question

I am beginner level in Node JS and here I am trying to connect to MongoDB.

I am following one tutorial and based on that, I have following project structure:

- server
  - config
    - db.js
  - index.js
- index.js

My mongoose dependency version is: 5.6.9

Inside my db.js, I have following code of lines:

const mongoose = require('mongoose');

// connection to mongoose
export default () => {
    mongoose.connect('mongodb://localhost/dbCollection', function(err, db) {
        if (err) {
            console.log('Unable to connect to the server. Please start the server. Error:', err);
        } else {
            console.log('Connected to Server successfully!');
        }
    });
}

And inside the index.js inside the server folder, I have

import express from 'express';
import dbConfig from './config/db';

const app = express();
dbConfig();

But I am getting error

 _mongoose2.default.connection().once('open', function () {
                       ^

TypeError: _mongoose2.default.connection is not a function
    at exports.default

You are using ES6 syntax which is not yet supported by NodeJs by default, so you have 2 options : 1/ In Node9 you can enable Es6 support using node --experimental-modules index.mjs Docs. 2/ Use Es5 syntax : module.exports = () => {...} and const dbConfig = require('./config/db'); — Moad Ennagi
– Moad Ennagi, Commented Aug 18, 2019 at 9:57

Wisdomrider · Accepted Answer · 2019-08-18 10:00:39Z

1

Try this :

const mongoose = require('mongoose');

const connect = mongoose.connect("mongodb://localhost:27017/dbCollection");

connect.then((db) => {
    console.log('Connected correctly to server');
}, (err) => {
    console.log(err)
    // next(err)
});

answered Aug 18, 2019 at 10:00

Wisdomrider

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1 Comment

nas Over a year ago

(0, _db2.default)(); ^ TypeError: (0 , _db2.default) is not a function i stil have this err

Bivin Vinod · Accepted Answer · 2019-08-19 06:35:32Z

Database Connection And listen Port

// import dependencies
import express from 'express';
import bodyParser from 'body-parser';
import mongoose from 'mongoose';
import logger from 'morgan';// set up dependencies
const app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false });
app.use(logger('dev'));// set up mongoose

mongoose.connect('mongodb://localhost/projectsupport')
  .then(()=> {
    console.log('Database connected');
  })
  .catch((error)=> {
    console.log('Error connecting to database');
  });

// set up port
    const port = 5035;// set up route
    app.get('/', (req, res) => {
      res.status(200).json({
        message: 'Welcome to Project Support',
      });
    });app.listen(port, () => {
      console.log(`Our server is running on port ${port}`);
    });

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