Why Does My Node.js Application Throw a \"Error: connect ECONNREFUSED\" When Connecting to MySQL?

Node.js MySQL Error: Connect ECONNREFUSED

Node.js users may encounter an "Error: connect ECONNREFUSED" when using MySQL, indicating that the server is unreachable. This issue can arise when deploying a Node.js application on a server and changing the MySQL connection configurations to that of the server.

Cause:

The error suggests that Node.js cannot establish a connection with the MySQL server at the specified host. This can occur if the server is not running or if the connection parameters (like host, user, and password) are incorrect.

Solution:

In the provided situation, the issue was resolved by changing host: 'localhost' to host: '127.0.0.1'. This suggests that Node.js was trying to connect to MySQL on localhost instead of the intended server. Adjusting the host to 127.0.0.1, which typically refers to the host machine, allowed Node.js to establish the connection successfully.

Additional Troubleshooting Steps:

If changing the host does not resolve the issue, consider the following steps:

• Ensure that the MySQL server is running on the server.
• Verify that the provided MySQL connection parameters (user, password, database) are correct.
• Check the firewall settings on the server to ensure that MySQL connections are allowed.
• Ensure that Node.js has the necessary permissions to connect to the MySQL server.

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