schlog-dev v0.5.0

Schlog

Simple Node.js logger

Installation

Install using yarn:

yarn add schlog

Or npm:

npm install schlog

Basic usage

const logger = require("schlog")

logger.setLogLevel(logger.getLogLevelByName("warn"))
// or set LOG_LEVEL environment variable to any of the default levels
// (by name or number)
// defaults to info (2)

logger.warn("Test")
// [21:52:58] WARN Test

logger.info("Test")
// nothing (since level is set to warn)

Default log levels: error, warn, info, debug or 0-4

error and warn will output to stderr while info and debug will output to stdout.

Log functions return the same thing they output to the console. Either the log line or nothing if the log level is set higher than the level called.

Example customization

const chalk = require("chalk")
const logger = require("schlog")
const LogLevel = require("schlog").LogLevel
const LogScope = require("schlog").LogScope

const logLevel = new LogLevel("fancy", chalk.magenta.underline, 4, LogScope.STDOUT)
logger.setLogLevel(logLevel)
// will only output with levels priorities 4 or lower

logger.setTimeFormat("MMMM Do YYYY, h:mm:ss a")
logger.log(logLevel, "Test")
// [March 21st 2019, 11:53:11 pm] FANCY Test

logger.setPrintTimestamps(false)
logger.log(logLevel, "Test")
// FANCY Test

logger.setPrintJson(true)
logger.log(logLevel, "Test")
// {"time":"21:52:58","level":{"name":"fancy","priority":4,"scope":"stdout"},"message":"Test"}