gosocketio/config.json

{
    "host": "localhost",
    "port": 3306,
    "logging": {
        "appenders": {
            "out": {
                "type": "console"
            },
            "server": {
                "type": "file",
                "options":{
                    "file": "./logs/server.log"  
                }
            }
        },
        "categories": {
            "default": {
                "appenders": ["out","server"],
                "level": "debug"
            }
        }
    }
}