What is the best practice to connect/disconnect to a database?

Question

I\'d like to know how to work with connectivity to a database in MEAN stack application. In particular, when should I create a connection to a database and when should I destroy

Answer 1

You want your connection to act like a singleton so as mentioned in the answer above it makes sense to do it outside of, and preferable before your routes:

var compression = require('compression');
var express  = require('express');
var app      = express();
var port     = process.env.PORT || 8080;
var cookieParser = require('cookie-parser');
var bodyParser   = require('body-parser');
var session      = require('express-session');
...

app.use(compression());
// db
var mongoose = require('mongoose');
var configDB = require('./config/database.js');
mongoose.connect(configDB.url); // connect to our database

config/database.js:

module.exports = {
'url' : '@localhost:27017/dbname'
};