Introduction to Aegis Logger

Aegis Logger is an advanced and powerful library designed for seamless application logging. It provides a plethora of features and APIs that make application logging and debugging efficient and effective.

Core Features and API Examples

Basic Usage

Importing and setting up the basic logger:

  
    const Logger = require('aegis-logger');
    const logger = new Logger();
    logger.log('This is a basic log message');
  

Log Levels

Aegis Logger supports various log levels to categorize log messages:

  
    logger.info('This is an info message');
    logger.warn('This is a warning message');
    logger.error('This is an error message');
    logger.debug('This is a debug message');
  

Customizing Log Levels

You can define custom log levels based on the specific needs of your application:

  
    const customLevels = {
      levels: {
        fatal: 0,
        error: 1,
        warn: 2,
        info: 3,
        debug: 4,
        trace: 5
      }
    };
    const customLogger = new Logger({ levels: customLevels.levels });
    customLogger.fatal('This is a fatal error message');
  

Formatting Log Messages

Customizing the format of log messages:

  
    const format = '([timestamp]) [level]: [message]';
    const formattedLogger = new Logger({ format });
    formattedLogger.info('This is a formatted info message');
  

Log Rotation

Enable log rotation to manage size and number of log files:

  
    const rotationOptions = {
      maxSize: '10M',
      maxFiles: '14d'
    };
    const rotatingLogger = new Logger({ rotation: rotationOptions });
    rotatingLogger.log('This is a log message with rotation enabled');
  

Application Example

Below is an example of a simple Node.js application using Aegis Logger:

  
    const express = require('express');
    const Logger = require('aegis-logger');
    const app = express();
    const logger = new Logger();

    app.use((req, res, next) => {
      logger.info(`Received request for ${req.url}`);
      next();
    });

    app.get('/', (req, res) => {
      logger.debug('Handling root route');
      res.send('Hello, Aegis Logger!');
    });

    app.listen(3000, () => {
      logger.info('Server is running on port 3000');
    });
  

This example demonstrates logging various levels of messages in an Express application, from incoming requests to route handling, and the server start-up.

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