const {connect, connection} = require('mongoose');
connect( 'mongodb://127.0.0.1:27017/socialNetwork',
{
userNewUrlParser: true,
useUnifiedTopology: true,
}
);
// use this to log mongo queries being exectuted!
mongoose.set('debug', true);
module.exports = connection;
Debe eliminar userNewUrlParser y useUnifiedTopology si está usando Mongoose v6+.
Prueba solo esto:
connect( 'mongodb://127.0.0.1:27017/socialNetwork);