Check Mysql Connection In Sequelize

Answer :

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) } 

You won't see errors, like password authentication errors, in .then.

From the sequelize documentation here:

You can use the .authenticate() function like this to test the connection.

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