An attempt at a extremely simple logger, which is easy to extend with code and not silly config.


SimplyLog is a project meant to bring more flexible and controllable logging into javascript. The primary goals are extensibility, simplicity, and compatibility. omething that allows developers to quickly turn logging on and off as they are debugging a site, and even control the amount of logging that gets output. In addition to allowing a developer or a team to attach more information to the debugging. And for teams allowing a standard logging style to be setup for their projects.

And lastly the syntax and API is intended to be as clear and easy to use as possible.

Creating a new logger

// Create a new console logger named example logger
//   A console logger is a logger with the console appender already
//   attached to it
var log = SimplyLog.consoleLogger('exampleLogger');

// Change the logging level from its default to TRACE level

// Send a message to the appender (which currently is a console appender)
log.trace('hello there', '!');
// The above line will result in the output exampleLogger:trace -> hello there!

// Changes this log to only output error messages

// This line won't actually output anything because the log level is set above it
log.debug('hello user');
// Add the logger
var logger = require('simply-log');

var myLog = logger.consoleLogger('myLog');

SimplyLog keeps track of all loggers you create within it, this means you can reuse loggers in different parts of your app as long as SimplyLog is at the root. For instance var logger = require('simply-log')


var doStuff = function() {
    // Do some stuff
    logger.consoleLogger('stuffLogger').trace('Hello World')

var adjustLogging = function(level) {
    // Adjust the logger used in the 'doStuff' function

// Will print hello world

// Will not print hello world

Messages are sent to the log appenders by calling the appropriate console log level method. The method to call is always the level you want to send in all lower case. As of now the current levels are error, info, warn, debug, trace. Any number of arguments can be passed to these methods For instance the following is legal

SimplyLog.error('Lorem', 'ipsom', $(window));

SimplyLog currently supports the following logging levels in order of highest level to lowest level, setting the level a level down will also send all log levels above it to the appender.

  • SimplyLog.OFF Highest level, will disable all output
  • SimplyLog.ERROR Intended for error level logging
  • SimplyLog.INFO General information level
  • SimplyLog.WARN Display api level warnings
  • SimplyLog.DEBUG Display debug level messages
  • SimplyLog.TRACE Trace level, most verbose level of logging

You can setup SimplyLog to automatically set the logging level for all logs built by it by calling SimplyLog.setDefaultLevel(SimplyLog.{level});

Appenders are a way of allowing the log system to be extended, anything you can code can be called as an appender. Any number of appenders can be added to a logger to allow Tutorial and more complex appenders to come, to get started now take a look at the defaultConsoleAppender in src/js/SimplyLog.js.