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Learn how to troubleshoot and resolve the ECONNREFUSED 127.0.0.1:3306 error in your Node.js app when connecting to MySQL. Explore common causes and solutions to ensure a seamless database connection.
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Troubleshooting MySQL Connection Error in Node.js: ECONNREFUSED 127.0.0.1:3306

If you're encountering the "connect ECONNREFUSED 127.0.0.1:3306" error when starting your Node.js app, it means that your application is unable to establish a connection to the MySQL database. This issue can be caused by various factors, and troubleshooting it requires a systematic approach. In this guide, we'll explore common causes of this error and provide solutions to help you get your Node.js app up and running smoothly.

Check MySQL Server Status

The first step is to ensure that your MySQL server is running. If the server is not running, your Node.js app won't be able to connect to it. Use the following command to check the status of your MySQL server:

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If the server is not running, start it with:

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Verify Connection Configuration

Double-check your MySQL connection configuration in your Node.js app. Ensure that the hostname, port, username, password, and database name are correctly specified. Any discrepancies in these details can result in the ECONNREFUSED error.

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Check Firewall Settings

Firewall settings might block the connection to the MySQL server. Ensure that your firewall allows traffic on the MySQL port (default is 3306). Adjust your firewall settings accordingly.

MySQL User Privileges

Make sure the MySQL user you're using in your Node.js app has the necessary privileges to access the specified database. You can check and grant privileges using the MySQL command line or a MySQL administration tool.

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Check for Other Processes on Port 3306

Ensure that there are no other processes using port 3306 on your machine. You can use the following command to identify processes using a specific port:

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If any processes are using port 3306, terminate or reconfigure them to free up the port.

By systematically addressing these common issues, you should be able to resolve the ECONNREFUSED 127.0.0.1:3306 error in your Node.js app. Remember to restart your Node.js app after implementing any changes to see the effects.