Full-Stack Web Development with Vue.js and Node

Introducing MongoDB Chapter 3

Connecting Mongoose to MongoDB

Once Mongoose is installed, we have to connect it to the MongoDB in order to start

working with it. This is pretty straightforward with Mongoose; we just have to add a piece
of code to require Mongoose in our app.js file and use the mongoose.connect method

to connect it to the database. Let's go ahead and do that. In the app.js file, add the

following code:

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');

This will import the Mongoose module into our codebase.

Now, to connect to the MongoDB database, add the following line of code in our app.js:

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 app = express();

//connect to mongodb

mongoose.connect('mongodb://localhost:27017/express_app', function() {

console.log('Connection has been made');

})

.catch(err => {

console.error('App starting error:', err.stack);

process.exit(1);

});

// Require file system module

var fs = require('file-system');