A small and simple multi-level logging library for node.js, colors optional.

npm i kindlogs

KindLogs will only log levels options.logLevel or below. By default this is 3 (error), so only logs at level 3 or below (more severe) will display:

const { KindLogs } = require('kindlogs');

const logs = new KindLogs()

function myFunction() {
  logs.log(6, 'Log level 6 (info)')
  logs.log(3, 'Log level 3 (error)')
}

myFunction()

[ERROR] Log level 3 (error)

In order to keep the library small, if you would like to use color mode, the ansis library must be installed separately:

npm i ansis

To enable color logs in console, spawn KindLogs with the color option:

const logs = new KindLogs({
  color: true
})

KindLogs uses numeric log-levels from 0-7, following the Syslog standard. To set the log level, spawn KindLogs with the logLevel option:

const logs = new KindLogs({
  logLevel: 7
})

function myFunction() {
  logs.log(6, 'Log level 6 (info)')
  logs.log(3, 'Log level 3 (error)')
}

myFunction()

In this example, all levels will be displayed:

[INFO] Log level 6 (info)
[ERROR] Log level 3 (error)

KindLogs enables easy logging to files. In order to log to files, configure KindLogs with the fileOptions option:

const logs = new KindLogs({
    fileOptions: {
      dir: "test/logs",
      name: "kindlogs"
    }
})

The above configuration will result in the creation of the test/logs/ directory. By default, logs will append to the <name>.error.log file if the level is 3 or below, and <name>.debug.log for all others, in the following format:

[5/26/2024, 12:52:42 AM] [EMERG] Log level 0 
[5/26/2024, 12:52:42 AM] [ALERT] Log level 1 
[5/26/2024, 12:52:42 AM] [CRIT] Log level 2 
[5/26/2024, 12:52:42 AM] [ERROR] Log level 3
...

File logging can be run at a different level than console logging. In order to achieve this, configure the fileOptions object with a logLevel parameter:

const logs = new KindLogs({
    fileOptions: {
      dir: "test/logs",
      name: "kindlogs",
      logLevel: 7
    }
})

Unless specified in the fileOptions object, the file-specific log level will be identical to the global logLevel option.