Why is my Node.js application getting an ECONNREFUSED error when connecting to MySQL?

Troubleshooting ECONNREFUSED Errors When Connecting to MySQL with Node.js

When attempting to connect to a MySQL server using Node.js, you may encounter the following error:

{ [Error: connect ECONNREFUSED] ... }

This error indicates that the server could not be reached, despite the server being accessible from other applications, such as an Apache/PHP server running on the same machine.

To resolve this issue, consider the following:

Connection Settings Verification

Ensure that the connection settings provided to MySQL's createConnection function are correct. Double-check the host, port, database name, username, and password.

Socket or TCP Connection

By default, MySQL listens on a Unix socket rather than a TCP socket. If you are using a Unix socket, you should specify the socket path in the connection options:

port: '/var/run/mysqld/mysqld.sock'

Firewall Settings

Confirm that the server's firewall is not blocking connections on the specified port (3308 in this case). Ensure that the port is open and accessible.

Server Status

Check the status of the MySQL server to ensure it is running and accepting connections. You can use the following command:

ps ax | grep mysqld

This should list the running MySQL processes.

Network Connectivity

Ensure that there is no network issue preventing the Node.js application from communicating with the MySQL server. Check network settings and firewall rules.

By addressing these potential issues, you should be able to connect to the MySQL server from your Node.js application and rectify the ECONNREFUSED error.

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