how to check sequile is connect or not in postgre innode code example

Example 1: new Sequelize('featherstutorial', 'databaseUser', 'databasePassword'

var sequelize = new Sequelize('database', 'username', 'password', {
  host: "my.server.tld",
  port: 12345
})

Example 2: new Sequelize('featherstutorial', 'databaseUser', 'databasePassword'

var sequelize = new Sequelize('database', 'username'[, 'password'])