Comprehensive Guide to mesg-logger for Efficient Logging in Complex Applications

The mesg-logger library is a powerful and versatile logging tool for developers. It provides an easy-to-use interface for logging messages in various formats and supports multiple logging levels. This guide introduces the mesg-logger library and provides dozens of useful API explanations with code snippets to help you get started.

Getting Started with mesg-logger

To install the mesg-logger library, use the following command:

  npm install mesg-logger

Basic Usage

Here is a basic example of how to use mesg-logger:

  const Logger = require('mesg-logger');
  const logger = new Logger('info');
  
  logger.info('This is an info message');
  logger.error('This is an error message');

Logging Levels

The mesg-logger library supports multiple logging levels. Here is how you can log messages of different levels:

  logger.debug('This is a debug message');
  logger.warn('This is a warning message');
  logger.fatal('This is a fatal message');

Configuring Output Formats

The mesg-logger library allows you to configure the output format of your logs. Here is an example:

  logger.setFormat('json');
  logger.info('This is an info message in JSON format');

Adding Custom Loggers

You can add custom loggers to handle different types of log messages. Here’s how:

  const customLogger = new Logger('trace');
  customLogger.trace('This is a custom trace message');

Using Transports

The mesg-logger library supports different transports for sending log messages. For example, you can log messages to a file:

  const fileTransport = require('mesg-logger-file-transport');
  logger.addTransport(fileTransport, { filename: 'logs/app.log' });
  logger.info('This message is logged to a file');

Async Logging

You can log messages asynchronously using mesg-logger. Here is how:

  async function logMessages() {
    await logger.info('This is an async info message');
    await logger.error('This is an async error message');
  }
  logMessages();

Application Example

Let’s create a small application that uses mesg-logger to log various types of messages:

  const express = require('express');
  const Logger = require('mesg-logger');
  
  const app = express();
  const logger = new Logger('info');
  
  app.use((req, res, next) => {
    logger.info(`Request to ${req.url}`);
    next();
  });
  
  app.get('/', (req, res) => {
    logger.info('Home page requested');
    res.send('Welcome to the Home Page');
  });
  
  app.get('/error', (req, res) => {
    logger.error('Error page requested');
    res.status(500).send('Error Page');
  });
  
  const PORT = 3000;
  app.listen(PORT, () => {
    logger.info(`Server is running on port ${PORT}`);
  });

By following this comprehensive guide, you will be able to effectively use mesg-logger in your applications for efficient and structured logging.

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