Page 632 - Nodejs 교과서 개정2판

ઙܐغח ࣽр ۽Ӓٜب ࢎۄ૑ӝ ٸޙੑפ׮ ী۞о ߊࢤೞݶ ী۞ ݫद૑ܳ ഛੋ೧ঠ ೞחؘ ࢲߡо ઙܐغ

য ী۞ ݫद૑ٜ੉ զইоߡܻח ട׼ೠ ੌ੉ ੌযաѱ ؾפ׮ ੉৬ э਷ ࢚ടਸ ߑ૑ೞ۰ݶ ۽Ӓܳ ౵ੌ੉ա
׮ܲ ؘ੉ఠ߬੉झী ੷੢೧ঠ ೤פ׮ ੉ٸ XJOTUPOਸ ࢎਊ೤פ׮

XJOTUPOਸ ࢸ஖ೞҊ ࢎਊ ߑߨਸ рױ൤ ঌইࠁѷणפ׮ ցޖա ׮নೠ ߑधਵ۽ ഝਊೡ ࣻ ੓য ӝࠄ੸ੋ Ѫ

݅ ࢓ಝࠇפ׮

콘솔

$ npm i winston

XJOTUPOਸ ࢸ஖ೠ ٍ MPHHFS KTܳ ੘ࢿ೤פ׮

logger.js

const { createLogger, format, transports } = require('winston');

const logger = createLogger({
level: 'info',
format: format.json(),
transports: [
new transports.File({ filename: 'combined.log' }),
new transports.File({ filename: 'error.log', level: 'error' }),
],
});

if (process.env.NODE_ENV !== 'production') {
logger.add(new transports.Console({ format: format.simple() }));
}

module.exports = logger;

XJOTUPO ಁః૑੄ createLogger ݫࢲ٘۽ loggerܳ ٟ݅פ׮ ੋࣻ۽ loggerী ؀ೠ ࢸ੿ਸ ֍য઴ ࣻ ੓णפ
׮ ࢸ੿ਵ۽ח level GPSNBU transports ١੉ ੓णפ׮

• level਷ ۽Ӓ੄ बпبܳ ੄޷೤פ׮ error warn info verbose debug TJMMZо ੓णפ׮ बпبࣽ erro
rо о੢ बп ੉޲۽ ਤ ࣽࢲܳ ଵҊೞৈ ӝ۾ೞӡ ਗೞח ਬഋ੄ ۽Ӓܳ Ҋܰݶ ؾפ׮ infoܳ Ҋܲ ҃਋

infoࠁ׮ बпೠ ױ҅੄ ۽Ӓ error warn ب ೣԋ ӝ۾ؾפ׮

• format਷ ۽Ӓ੄ ഋधੑפ׮ json label timestamp printf simple combine ١੄ ׮নೠ ഋध੉ ੓ण
פ׮ ӝࠄ੸ਵ۽ח +40/ ഋधਵ۽ ӝ۾ೞ૑݅ ۽Ӓ ӝ۾ दрਸ ಴दೞ۰ݶ timestampܳ ॳח Ѫ੉ જण

פ׮ combine਷ ৈ۞ ഋधਸ ഒ೤೧ࢲ ࢎਊೡ ٸ ॺפ׮ ഝਊߨ੉ ׮নೞ޲۽ ҕध ޙࢲܳ ଵҊೞӡ ߄ۉ
פ׮