Logger

Description

A tiny Node.js logger that is based on debug module.

Usage

If you have ever used debug module, it will be easy for you. Like debug module, this module exposes a function. Just pass a name of your module into this function and it will return an accustomed logger interface.

• error()
• warn()
• info()
• debug()

The first benefit is different suffixes which added to the namespace. Let's see.

const logger = require('debug')('test');

logger.error('something happened wrong') // **test.error** error happened +0ms
logger.warn('something happened wrong') // **test.warn** something happened wrong +0ms
logger.info('just some neutral information') // **test.info** just some neutral information +0ms
logger.debug('some boring data', {a: 1, b: 2}) // **test.debug** some boring data { a: 1, b: 2 } +0ms

So, you will be able to recognize different levels of messages.

As a common logger this one works with LOG_LEVEL. Just set the one of the following ['error', 'warn', 'info', 'debug'] level to env LOG_LEVEL . After that manipulation, the set level will be highest. It means LOG_LEVEL=warn will show you messages with suffix error and warn.

The second benefit is using of wildcard. All is you need is set env DEBUG Let's see on common patterns:

• * - show all the logs
• *.level - show logs from all the modules with specific level
• module.* - show all level logs of some specific module
• module.level - show specific level logs of specific module

Benchmark

logger.info*10000 ~ 328ms