Check mysql connection in sequelize

As of latest version of Sequelize (i.e. 3.3.2), authenticate can be used to check the connection:

var sequelize = new Sequelize("db", "user", "pass");

sequelize.authenticate().then(function(errors) { console.log(errors) });

authenticate simply runs SELECT 1+1 AS result query to check the db connection.

UPDATE:

Errors by the newest API need to be handled in catch:

sequelize
  .authenticate()
  .then(() => {
    console.log('Connection has been established successfully.');
  })
  .catch(err => {
    console.error('Unable to connect to the database:', err);
  });

UPDATE 2:

I haven’t tested this, but its only logical that the same thing can be reached with async/await:

try {
  await sequelize.authenticate()
} catch (err) {
  console.error('Unable to connect to the database:', err)
}