Log4js-filter-appender NPM

log4js-filter-appender

based on log4js and pm2, filter log by word,level,category

The features include two parts, log4js appender and cli. 1, config appender into log4js 2, use pm2 start app 3, use cli switch log filter

log4js-filter-appender

install

npm install log4js-filter-appender --save

use by coding

let filterAppender = require('log4js-filter-appender');

// appender(appenderConfig)
let appender = filterAppender.appender({type: 'file', filename: 'logs/test/filter-1.log'});
log4js.addAppender(appender);

use by config

log4js.configure({
    appenders: [
        {type: 'console'},
        {
            type: 'log4js-filter-appender',
            
            // appender value can be any log4js  appender config
            appender: {type: 'file', filename: 'logs/test2/filter-1.log'},
            category: 'test'
        },
        {
            type:'log4js-filter-appender',
            appender: {type: 'file', filename: 'logs/test2/filter-2.log'}
        }
    ]
});

cli

install

npm install -g log4js-filter-appender

command

use dlog4js change filter

help

dlog4js -h

Commands:

start [options]   enable FilterAppender for log4js
stop

Options:

-h, --help          output usage information
-V, --version       output the version number
-p --pid [n]        pm2 process id
-n --pname [value]  pm2 process name

start

dlog4js start -h

Usage: start options

enable FilterAppender for log4js

Options:

-h, --help             output usage information
-l --level [value]     log level
-c --category [value]  log category
-w --word [value]    filter log by this value, can be regular. ps: (test)|(info)
-f --force [boolean] focre change logger level, true or false

change pm2 process '0' log level to info