Why Am I Getting an 'ECONNREFUSED' Error When Connecting to MySQL with Node.js?

'ECONNREFUSED' Error in Node.js MySQL Connection

When attempting to connect to a MySQL server using Node.js, you might encounter the 'ECONNREFUSED' error. This error is commonly associated with the connection being refused by the server.

Potential Causes:

• Try connecting to the wrong port. Ensure that you are using the correct port for the MySQL server.
• MySQL server not running. Verify that the MySQL server process is running on the specified host.
• Firewall blocking port. Check that any firewalls or security groups are not blocking the TCP port you are using to connect.
• Unix socket instead of TCP socket. In some cases, MySQL can listen on a Unix socket instead of a TCP socket. This requires specifying the path to the Unix socket in the connection options.

Solution:

If you have checked the potential causes and none of them apply, consider adjusting the port option in your connection parameters. Instead of specifying the TCP port, try specifying the path to the Unix socket using '/var/run/mysqld/mysqld.sock' as follows:

var mysql_link = {
  host: 'localhost',
  port: '/var/run/mysqld/mysqld.sock', // Unix socket path
  database: 'nodetest',
  user: 'root',
  password: 'xxx',
};

var connection = mysql.createConnection(mysql_link);

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