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1.0.1 • Public • Published


npm Code: TypeScript Made By: StudiMax

A logger system with configurable transporters.


npm install @studimax/logger
# or
yarn add @studimax/logger


The logger system is a simple and flexible logging system. It is designed to be used in a modular way, so that you can easily add new transports.

2021-12-22 13:23:58.47	<error>	Logger.spec.ts:5	(Object.<anonymous>)    log1 {"hello":"world"}


import Logger from '@studimax/logger';

const logger = Logger({
    transports: [Logger.TRANSPORTS.CONSOLE_LOG(), Logger.TRANSPORTS.DATED_LOG()],
    levels: {
        extra: {
            color: '#ff0000',
            level: 1,
logger.info('Hello World!');

Logger default options

import Logger from '@studimax/logger';
    format: '{timestamp}\t<{level.name}>\t{file}:{line}\t({method})\t{message} {metadata}', //see format docs
    dateFormat: 'YYYY-MM-DD HH:mm:ss.SS', // use fecha to format date
    logFolder: 'logs',
    logHistory: 100, // keep 100 logs
    transports: [], // by default, no transports
    transportTimeout: 1000, // timeout for transports
    levels: {}, // by default, use default levels but can be overridden

Default Levels

The color is used to display the level name in the console.

Description Level Tag Color
Trace 0 trace #0099ff #0099ff
Debug 1 debug #00cc99 #00cc99
Info 2 info #00cc30 #00cc30
Warn 3 warn #ffcc00 #ffcc00
Error 4 error #ff0000 #ff0000
Fatal 5 fatal #a70000 #a70000

Custom Levels

const levels = {
    myCustomTag: {
        color: '#ff0000',
        level: 1

Custom Format

Format is a string that can contain the following placeholders:

  • {timestamp}: the timestamp of the log formatted with the dateFormat option
  • {level}: level object containing name, level and color
  • {file}: the file where the log was called
  • {line}: the line where the log was called
  • {method}: the method where the log was called
  • {message}: the message of the log
  • {metadata}: the metadata object passed to the log

You can use the dot notation . to access nested properties. For example, {metadata.foo} will access the foo property of the metadata object. See @studimax/ts package for more information.


This package provides the following transporters:


This transporter logs to the console.


This transporter logs to a file with a date prefix. The file is created if it doesn't exist. This transporter implements the FIFO strategy, first log is the first to be written.


This transporter logs to a file with a name prefix.

Custom Transporter

You can create your own transporters by creating an async function.

async function MyCustomTransporter(data: Data, options: TransportOptions) {
    if(await options.transportReady){
        // do something when the same previous logs transport has been resolved.

TransportOptions extends LoggerOptions ans add more properties:

  • ready: a promise that is resolved when all previous logs transports have been resolved.
  • transportReady: a promise that is resolved when the same previous logs transport has been resolved.

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npm i @studimax/logger

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  • maxscharwath