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 :)
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');
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.
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
Related
I have installed log4js npm and try to implement logger to my node api...
I am trying to use log4js for the first time.
Code:
var log4js = require('log4js'); // include log4js
log4js.configure({ // configure to use all types in different files.
appenders: [
{ type: 'file',
filename: "/logs/error.log", // specify the path where u want logs folder error.log
category: 'error',
maxLogSize: 20480,
backups: 10
},
{ type: "file",
filename: "/logs/info.log", // specify the path where u want logs folder info.log
category: 'info',
maxLogSize: 20480,
backups: 10
},
{ type: 'file',
filename: "/logs/debug.log", // specify the path where u want logs folder debug.log
category: 'debug',
maxLogSize: 20480,
backups: 10
}
]
});
var loggerinfo = log4js.getLogger('info'); // initialize the var to use.
var loggererror = log4js.getLogger('error'); // initialize the var to use.
var loggerdebug = log4js.getLogger('debug'); // initialize the var to use.
loggerinfo.info('This is Information Logger');
loggererror.info('This is Error Logger');
loggerdebug.info('This is Debugger');
I got error:
****throw new Error(`Problem with log4js configuration: (${util.inspect(config, { depth: 5 })})`
^
Error: Problem with log4js configuration: ({ appenders:
[ { type: 'file',
filename: '/logs/error.log',
category: 'error',
maxLogSize: 20480,
backups: 10 },
{ type: 'file',
filename: '/logs/info.log',
category: 'info',
maxLogSize: 20480,
backups: 10 },
{ type: 'file',
filename: '/logs/debug.log',
category: 'debug',
maxLogSize: 20480,
backups: 10 } ] }) - must have a property "appenders" of type object.****
I have run a log4js sample code in my application using cmd node log4js.js(this file name)
Please help me...
I have this.
File name: myHelperlog4js.js
const { configure, getLogger } = require("log4js");
configure({
appenders: {
console: { type: 'console' ,"layout": { "type": "pattern", "pattern": "%d - %c:[%p]: %m" }},
fileLog: { type: 'file', filename: '/logs/application.log' }
},
categories: {
default: { appenders: ['console','fileLog'], level: 'trace' },
}
});
const logger = getLogger();
module.exports = {logger};
in your file to use, have this:
const {logger } = require('MY PAHT OF MY JS CONFIGURED/myHelperlog4js');
and for use only:
logger.info(msg);
logger.info(msg);
logger.debug(msg);
logger.info(msg);
logger.warn(msg);
logger.error(msg);
logger.fatal(msg);
logger.info(msg);
/logs/application.log: save log in:
Windows (C:/logs/)
linux (/logs/)
I want to have log files on a daily basis. I dont want both of them to create separate log files. I just want a single log file on a daily
basis.
example: application-YYYY-MM-DD:HH:MM.log (Log Rotation)
How can I achieve this ?
Also, PM2 Log Rotate doesn't support timestamps for logging. So, How can I merge both features?
I Attached ecosystem.config.js as well as logger.js
ecosystem.config.js
module.exports = {
apps: [{
name: 'API',
script: 'app.js',
instances: 1,
autorestart: true,
watch: false,
max_memory_restart: '1G',
output: `./logs/starter-logs.log`,
error: `./logs/starter-errors.log`,
log: './logs/combined.outerr.log',
log_date_format: 'DD-MM-YYYY HH:mm:ss:SS Z',
append_env_to_name: true,
// For merging cluster mode logs
merge_logs: true,
env: {
NODE_ENV: 'development',
PORT: 3002,
MONGODB_URI: 'mongodb://localhost:27017/test'
},
env_production: {
NODE_ENV: 'production',
PORT: 3004,
}
}]
logger.js
const logger = createLogger({
level: 'info',
format: format.combine(
format.timestamp({
format: 'YYYY-MM-DD HH:mm:ss'
}),
format.errors({ stack: true }),
format.splat(),
format.json()
),
transports: [
new transports.File({ filename: `${logFileName}-error.log`, level: 'error' }),
new transports.File({ filename: `${logFileName}-combined.log` }),
new transports.Console(),
]
});
Need a Single Log file, Instead of PM2 creating logs as well as Winston creating log files.
Also, I need File Transport as well as Console Transport. Please check the above code.
I'm trying to create a logger configuration which logs only "ERROR" level information to console and "DEBUG" level information to file appenders.
Can anyone help on how to create a logger with above config?
Thanks in advance. Help is very much appreciated
var log4js = require('log4js');
log4js.configure({
appenders: {
everything: { type: 'stdout' },
file_log: { type: 'file', filename: 'anyPath/all-logs.log' },
logLevelFilter: {
type: 'logLevelFilter',
level: 'debug',
appender: 'file_log',
},
},
categories: {
default: {
appenders: ['logLevelFilter', 'everything'],
level: 'all',
},
},
});
const logger = log4js.getLogger();
in this example all logs will be shown in the console , but only debug level and above will be add to file (in this example file located in 'Logs_and_others/all-the-logs.log')
For ERROR in console, you can directly have console.log statements. For DEBUG, you can add that in your config feel like below-
const log4js = require('log4js'); // include log4js
log4js.configure({
appenders: { app: { type: 'file', filename: 'app.log' } },
categories: { default: { appenders: ['app'], level: 'debug' } }
});
const logger = log4js.getLogger('app');
logger.debug('Your debug message');
You need to provide the level category inside categories in your config file.
Hope this should help.
currently I have log file where I am storing the log details. But I want to store the set of details on the every-day basis and it should generate the new file automatically.
module.exports.log = log4js.configure({
appenders: { log-info: { type: 'file', filename: 'logs/info.text'}},
categories: { default: { appenders: ['log-info'], level: 'info' } }
});
I browsed through few stuffs, but I din't got any proper required info. Any link/advice, greatly appreciated.
I have use winston which work as your requirement.
Create logs directory in your root folder and try this code
var winston = require('winston');
var path = require('path');
let __base = path.resolve(__dirname, '..');
var logger = new (winston.Logger)({
levels: {
error: 0,
warn: 1,
info: 2,
debug :4
},
transports: [
new (winston.transports.Console)({
prettyPrint: true,
colorize: true,
timestamp: true
}),
new (winston.transports.File)({
name: 'errorLogger',
filename: `${__base}/logs/log-${new Date().toLocaleDateString().replace(/\//g, '-')}.log`,
colorize: true,
/**
*
*
* #returns
*/
timestamp: function () {
return (new Date().toLocaleString())
}
})
],
colors: {
info: "green",
error: "red",
warn: "yellow",
debug: "blue"
}
});
logger.level = 'info';
logger.info('Hello');
module.exports = logger;
After running this code you will see a file is generated in logs folder with Hello content.
You can also import this file in other file and use logger.info for printing and saving the logs
You can use the alwaysIncludePattern, just set it to true, like alwaysIncludePattern: true and dont forget to set the pattern with pattern: 'yyyy-MM-dd.log
const log4js = require("log4js");
logger = log4js.getLogger();
log4js.configure({
appenders: {
appender: {
type: 'file',
filename: 'log',
keepFileExt: true,
compress: true,
pattern: 'yyyy-MM-dd.log',
alwaysIncludePattern: true,
},
},
categories: {
default: {
appenders: ['appender'],
level: 'all',
},
},
});
logger.debug(`up and running`);
Filename: log.2022-01-26.log
Content: [2022-01-26T14:44:32.769] [DEBUG] default - up and running
Source: Date Rolling File Appender
I am working on node Js logging library. I am using winston for this.I created log files but I stuck when I want to create two log files.Suppose I have to create all log file which contain all logs and error log file which contain only error logs.But I stuck here:
if (!fs.existsSync(logDir)) {
fs.mkdirSync(logDir);
}
const tsFormat = () => (new Date()).toLocaleTimeString();
let logger = new(winston.Logger)({
transports: [
new(winston.transports.Console)({
level: 'debug',
timestamp: tsFormat,
handleExceptions: true,
colorize: true,
json: false
}),
new(winston.transports.File)({
name: 'all-file',
handleExceptions: true,
filename: `${logDir}/all-file.log`,
level: 'debug',
maxsize: 100000000,
json: true
}),
new(winston.transports.File)({
name: 'error-file',
handleExceptions: true,
filename: `${logDir}/error-file.log`,
level: 'error',
maxsize: 100000000,
json: false
})
]
});
I want that error log show different type of console than debug console.But by default its only taking debug one. how can I manually add console config for both files.When I try to add another transport.console it shows error.
Transport already attached: console, assign a different name
var winston = require('winston');
let consoleLogger = function(options){
return new (winston.Logger)({
transports: [
new (winston.transports.Console)(options),
]
});
}
// the CustomTransport is to prevent error log show multiple times
class CustomTransport extends winston.Transport {
constructor(options) {
super(options);
this.options = options;
this.levels = options && options.levels || [this.level];
}
log(level, msg, meta, callback) {
if(this.levels.indexOf(level) > -1){
consoleLogger(this.options)[level](msg, meta);
}
callback(null, true);
}
}
winston.transports.CustomTransport = CustomTransport;
const tsFormat = () => (new Date()).toLocaleTimeString();
var logger = new (winston.Logger)({
transports: [
// add name attribute to prevent Transport already attached error
// no error log for this transport
new (winston.transports.CustomTransport)(
{
name: 'info-console',
level: 'debug',
levels : ['debug', 'verbose', 'info', 'warn'],
timestamp: tsFormat,
handleExceptions: true,
colorize: true,
json: false
}
),
// only error log for this transport, modify the configuration as you need
new (winston.transports.CustomTransport)(
{
name: 'error-console',
level: 'error',
timestamp: tsFormat,
handleExceptions: true,
colorize: true,
json: false
}
),
new (winston.transports.File)(
{
name: 'info-file',
filename: 'info.log',
timestamp: true,
maxsize: 1024000,
level: 'info'
}),
new (winston.transports.File)(
{
name: 'error-file',
filename: 'error.txt',
timestamp: true,
maxsize: 1024000,
level: 'error'
})
]});
usage:
logger.debug('debug');
logger.error('error');