I have a project nodejs and use log4js to write log.
I want create new file log when start new date.
Example:
daily.2017_07_31.log
daily.2017_08_01.log
daily.2017_08_02.log
daily.2017_08_03.log
In java, I know config log4j but in nodejs with log4js I don't know.
Thank every body for your help :)
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3 Answers
winston is recommended for nodejs. Its pretty easy to use.
Create a logger.js file and have this configuration '
require('winston-daily-rotate-file');
var winston = require('winston');
winston.loggers.add('logger', {
transports: [
new (winston.transports.Console)(
{
level: config.debugLogLevel,
colorize: true
}),
//new files will be generated each day, the date patter indicates the frequency of creating a file.
new winston.transports.DailyRotateFile({
name: 'debug-log',
filename: '<log file name>',
level: '<level>',
prepend: true,
datePattern: '<pattern>',
maxFiles: <max file>
}
),
new (winston.transports.DailyRotateFile)({
name: 'error-log',
filename: '<log file name>',
level: '<level>',
prepend: true,
datePattern: '<pattern>',
maxFiles: <max file>
})
]
});
var logger = winston.loggers.get('logger');
Object.defineProperty(exports, "LOG", {value: logger});
now you can use it anywhere like
var log = require('./logger.js').LOG
log.error('hello');
4 Comments
ManishKumar
and most interesting part is, you can also configure email as transport. All the log can be emailed you with just some configuration.
phuchoangmai
The first. thank you for your help. I had use search for keyword winston log and have answer. But I have a problem with dependency :). In file package.json I add line "winston-daily-rotate-file": "~1.4.6" but when I run it, have a error <b>Error: Cannot find module 'winston'</b>
phuchoangmai
Hi @Manish Kumanwat. I try same you answer. But it not working, it not show any error and not create file log? Can you help me
ManishKumar
@NguyễnPhúc Can you please provide me detail about configuration that you have in your code?
See: https://github.com/log4js-node/log4js-node/blob/master/docs/dateFile.md
log4js.configure({
appenders: {
everything: { type: 'dateFile', filename: 'all-the-logs.log' }
},
categories: {
default: { appenders: [ 'everything' ], level: 'debug' }
}
});
This example will result in files being rolled every day. The initial file will be all-the-logs.log, with the daily backups being all-the-logs.log.2017-04-30, etc.
Comments
Not found for daily rolling, but for size the configuration of log4js allows file rolling. Pay attention to maxLogSize, backups and compress properties. Example from its docs:
log4js.configure({
appenders: {
everything: {
type: 'file',
filename: 'all-the-logs.log',
maxLogSize: 10485760,
backups: 3,
compress: true
}
},
categories: {
default: { appenders: [ 'everything' ], level: 'debug'}
}
});
See https://github.com/log4js-node/log4js-node/blob/master/docs/file.md
