Docker - SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:3306

node.js docker express sequelize.js

Insteaf of localhost point to mysql which is the service name (DNS) that nodejs will resolve into the MySQL container:

DB_HOSTNAME: mysql

And

 {  ...  host: 'mysql',  ... }

node.js docker express sequelize.js

Inside of the container you should reference the container by the name you gave in your docker-compose.yml file.

In this case you should use

DB_HOSTNAME: mysql

node.js docker express sequelize.js

use your connection string as :mysql://username:password@mysql:(port_running_on_container)or(exposed_port)/db_name

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