How to log JavaScript objects and arrays in winston as console.log does?
logger.log("info", "Starting up with config %j", config);Winstons uses the built-in utils.format library.https://nodejs.org/dist/latest/docs/api/util.html#util_util_format_format_args
try changing prettyPrint parameter to
prettyPrint: function ( object ){ return JSON.stringify(object);}
In Winston > 3 you can use
logger.log('%o', { lol: 123 }')Anyway...Couldn't accept that I have to use %o always and made this simple solution:
const prettyJson = format.printf(info => { if (info.message.constructor === Object) { info.message = JSON.stringify(info.message, null, 4) } return `${info.level}: ${info.message}`})const logger = createLogger({ level: 'info', format: format.combine( format.colorize(), format.prettyPrint(), format.splat(), format.simple(), prettyJson, ), transports: [ new transports.Console({}) ],})So this logger....
logger.info({ hi: 123 })...transforms to this in the console
info: { "hi": 123}