levelog

A small Node library that determines your current log level.

Overview

Most logging libraries are just that - logging libraries. This one is different. It doesn't try to log your messages or connect to some fancy cloud-based aggregation service.

Instead - it provides you an API that allows you to determine, in code, what your current level is - based on process.evn.LOG_LEVEL environmental variable.

This way you can align your various logging modules (morgan, winston and custom, for instance) to the same value.

Installation

npm install --save-dev levelog

API

The API is very simple - provided you required the levelog module in the following manner:

const LOG_LEVEL = require('levelog');

LOG_LEVEL provides the following immutable properties:

• TRACE
• DEBUG
• INFO
• WARNING
• ERROR
• FATAL

each corresponding to the current log level as set by process.env.LOG_LEVEL.

Custom Decision Function

You can, alternatively, override the function that determines the log level and the default log level (INFO instead of TRACE, in example below):

const init = require('levelog/lib/custom');

LOG_LEVEL = init(function(level) {
    return (process.env.LOG_LEVEL === level.toLowerCase());
}, 'INFO');

which would then allow you to call the same API:

if (LOG_LEVEL.INFO) {
    // do something when the log level is set to INFO
}

Future Plans

In addition to the current API, there will be a comparative API that would look something like this:

if (LOG_LEVEL.greaterOrEqual(INFO)) {
    // do something when the log level is set to INFO
}