logger

Author: Frank Gu <frank@voicelfow.com> 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').default;
// or
import Logger from '@voiceflow/logger';

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

const overrideOptions = {
  level: 'trace', // Minimum log-level to be printed
  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.