@monterosa/logger

MLogger

The colorful tool for the NodeJS and browsers logs

Install

$ npm install @monterosa/logger

Usage

import { LEVELS, setLevel, getLogger } from '@monterosa/logger';

setLevel(LEVELS.DEBUG); // LEVELS.INFO by default

const logger = getLogger('prefix');

logger.info("this is '%s' level", 'info'); // {"@level":"info","@timestamp":"2018-05-15T09:09:11.781Z","@prefix":"prefix","@message":"this is 'info' level","@splat":["info"]}

logger.warn("this is %j", { level: 'info' }); // {"@level":"warn","@timestamp":"2018-05-15T09:09:11.782Z","@prefix":"prefix","@message":"this is {\"level\":\"info\"}","@splat":[{"level":"info"}]}

logger.error("Fatal error %s", new Error('some error')); // {"@level":"error","@timestamp":"2018-05-15T09:09:11.782Z","@prefix":"prefix","@message":"Fatal error Error: some error","@splat":[{}]}

logger.debug("userName=%s, userData=%j", 'z4o4z', data); // {"@level":"error","@timestamp":"2018-05-15T09:09:11.782Z","@prefix":"prefix","@message":"userName=z4o4z, userData={...}","@splat":['z4o4z', {...}]}

API

• LEVELS
• setLevel
• getLogger
• setTransport

LEVELS

The map of available log levels.

LEVELS.ERROR // error
LEVELS.WARN // warn
LEVELS.INFO // info
LEVELS.DEBUG // debug
LEVELS.VERBOSE // verbose
LEVELS.SILLY // silly

setLevel

The method to set log level. Gets level as an argument. By default level is LEVELS.INFO. Can be called in runtime.

setLevel(LEVELS.DEBUG);

getLogger

The method gets some prefix and returns logger instance with methods below:

logger.error
logger.warn
logger.info
logger.debug
logger.verbose
logger.silly

The prefix will be added to the logs as @prefix, for the NodeJS applications we are recommending to use __filename(global variable) as a prefix for easy debugging and finding something in the logs

setTransport

This method allows you set function which will be called before logging something in the console.

Created by

• Evgeny Zaytsev

License

MIT