JSON 1

var winston = require('winston');
winston.add(
    winston.transports.File, {
        filename: 'node-log-file.json.log',
        level: 'info',
        json: true,
        eol: '\n', // for Windows, or `eol: '\n',` for *NIX OSs
        timestamp: true
    }
);
winston.log('info', 'Hello log files!');
winston.info('Hello again log files!');
winston.debug('Could not connect to database.');