ErezNagar / loggerjs

A very simple logger for Node.js

Loggerjs

A simple logger for Node.js

How to use

var logger = require("./logger.js");
logger = logger.create();
...
logger.error("An error level log message");

Features

• 5 logging methods:
  • logger.error()
  • logger.warn()
  • logger.info()
  • logger.debug()
  • logger.trace()
• Log level filter - filter logging nicely for production or for a crazy debugging session.
• Log category - mark logging with a category
• Log to default console and/or to a log file
• Show/hide date and time

Options

Category

Set logging with a category:

logger = logger.create({ category: "MyCat" });
logger.error("A log message");
// output: ERROR MyCat A log message

Log level

Set different logging level (Default is logger.levels.ERROR). Same as using setLevel().

logger = logger.create({ level: "trace" });
// Or logger = logger.create({ level: logger.levels.TRACE });

Log to a file

Set absolute file path to a log file, in addition to the default console:

logger = logger.create({ file: "C:\logs\myLog.log" });

Or use only a log file:

logger = logger.create({
	console: false,
	file: "C:\logs\myLog.log"
});

API

Loggerjs outputs [DATE] [TIME] [Category] LEVEL logMessage

• logger.levels.LEVEL

All logger level constants: logger.levels.ERROR, logger.levels.WARN, logger.levels.INFO, logger.levels.DEBUG, logger.levels.TRACE.

• setLevel(level) Default: logger.levels.ERROR

Disables all logging below the given level. level - one of the logging levels.

logger.setLevel(logger.levels.WARN);
logger.warn("WARN log messages would be shown");
logger.error("ERROR log messages would be shown");
logger.info("INFO log messages would be ignored");

• showDateTime([options])

options - An optional options object with the following attributes:

showDate - Boolean indicating whether to show current date in log or not.

showTime - Boolean indicating whether to show current time in log or not.

If no options are passed, showDate and showTime are set to false.

License

Licensed under the MIT license.