node-log4js.js

const log4js = require('log4js');

const LOG_LEVEL = process.env.LOG_LEVEL || 'debug';

if (LOG_LEVEL === 'debug') {
    log4js.configure({
        appenders: {
            out: { type: 'stdout',
                layout: {
                    type: 'pattern',
                    pattern: '%[%d %p %f:%l %n%m%n %]'
                } }
        },
        categories: { default: { appenders: ['out'], level: LOG_LEVEL, enableCallStack: true } }
    });
}

const logger = log4js.getLogger();
logger.level = LOG_LEVEL;

module.exports = logger;