log-stderr v0.1.0

log-stderr

Simple Node.js logger without dependencies. Prints formatted messages to stderr.

Installation

Using npm:

$ npm install --save log-stderr

Using yarn:

$ yarn add log-stderr

Configuration

Via environment variables:

• LOG_LEVEL - minimum logging level. Can be on of values: debug, notice, info, warn or error.

  Logger is silent by default.

• LOG_TIME - if has any non-empty value, prints timestamp in ISO format:

  2019-08-25T14:59:04.792Z D Debug message

  When variable has no value:

  D Debug message

Usage

const log = require('log-stderr');

log.debug('Debug message');
log.notice('Notice message %o', { test: 'object' });
log.info(false);
log.warn([1, 2, 3]);
log.error(new Error('Error test'));

Example output:

D Debug message
N Notice message { test: 'object' }
I false
W [ 1, 2, 3 ]
E Error: Error test
    at Object.<anonymous> (.../log-stderr/test.js:7:11)
    at Module._compile (internal/modules/cjs/loader.js:868:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:879:10)
    at Module.load (internal/modules/cjs/loader.js:731:32)
    at Function.Module._load (internal/modules/cjs/loader.js:644:12)
    at Function.Module.runMain (internal/modules/cjs/loader.js:931:10)
    at internal/main/run_main_module.js:17:11