@voiceflow/logger

logger

Author: Frank Gu <[e-mail]>
Date: Dec 11, 2019

A logging package for VERY fast and useful JSON logging.

• All log entries go to process.stdout
• Minimal overhead and no logger hierarchies
• Multiple instantiations allowed

Usage

const Logger = require('@voiceflow/logger');

defaultOptions = {
  level: 'info',
  stackTrace: false,
  pretty: false,
};

overrideOptions = {
  level: 'trace',      // Minimum log-level to be printed
  stackTrace: true,   // Enable stack traces
  pretty: true,       // Pretty print
};

const defaultlogger = new Logger();  // Default options
const customLogger = new Logger(overrideOptions);

defaultlogger.trace("this is a trace");
defaultlogger.debug("this is a debug");
defaultlogger.info("this is an info");
defaultlogger.warn("this is a warning");
defaultlogger.error("this is an error");
defaultlogger.fatal("this is a fatal");

customLogger.trace("this is a trace");
customLogger.debug("this is a debug");
customLogger.info("this is an info");
customLogger.warn("this is a warning");
customLogger.error("this is an error");
customLogger.fatal("this is a fatal");

Development Assitance

• For warn logs, the calling function and line number is included
• For error and fatal logs, the full call-stack is included

Pretty Printing

Pretty printing will add colors, parse unix epoch timestamps into UTC time.