A simple logging library for SEC-Block System

Usage no npm install needed!

<script type="module">
  import secBlockSecjsLogger from 'https://cdn.skypack.dev/@sec-block/secjs-logger';


SEC Logger

JavaScript Style Guide



A simple logging library for SEC-Block


A logger has 5 different levels of logging in a specific order:

'fatal', 'error', 'warn', 'info', 'debug' Each of these log levels has its own method on the logging instance. You can set the maximum log level on a logger at runtime.

By default, a logger writes to STDOUT, but given a writeable file path, it will log directly to a file.


// standardjs style
const logger = require('./logger').createLogger() // logs to STDOUT
const logger = require('./logger').createLogger('development.log') // logs to a file


Any of the logging methods take n arguments, which are each joined by ' '. If an argument is not a string, it is string-ified by util.inspect()

logger.info('loading an array', [1,2,3], 'now!')
// info [Sat Jun 12 2018 01:12:05 GMT-0400 (EDT)]  loading an array [ 1, 2, 3, [length]: 3 ] now!
logger.debug('this wont be logged')
// false
logger.debug('this will be logged now')
// debug [Sat Jun 12 2018 01:12:54 GMT-0400 (EDT)]  this will be logged now


You can completely customize the look of the log by overriding the format() method on a logger.

logger.format = function(level, date, message) {
  return date.getTime().toString() + '; ' + message
// 1276365362167;  message


MIT, see the source.