Introduction to Juggler Logger

The Juggler Logger is a robust and flexible logging library designed to make logging in your application effortless and efficient. Whether you’re logging to the console, files, or external services, Juggler Logger provides an intuitive API to help keep your application in check.

Key Features

• Lightweight and fast
• Flexible configuration options
• Supports multiple logging levels
• Easy integration with any application

Quick Start

  
    const logger = require('juggler-logger');
    
    // Simple log
    logger.log('This is a simple log message');
    
    // Different log levels
    logger.info('This is an info message');
    logger.warn('This is a warning');
    logger.error('This is an error');
    
    // Log with metadata
    logger.log('User logged in', { userId: 12345 });
  

Advanced Configuration

Juggler Logger allows you to configure settings to suit your application requirements.

  
    const logger = require('juggler-logger');
    
    // Custom configuration
    logger.configure({
      level: 'info', // Set the logging level
      transports: [
        new logger.transports.Console(),
        new logger.transports.File({ filename: 'logs/app.log' })
      ]
    });
  

Using Custom Transports

You can define and use custom transports to direct logs to various destinations.

  
    const logger = require('juggler-logger');
    
    class MyCustomTransport {
      log(info, callback) {
        // custom logic to process log messages
      }
    }
    
    logger.configure({
      transports: [new MyCustomTransport()]
    });
    
    logger.info('This is routed via MyCustomTransport');
  

App Example

Let’s see how to use Juggler Logger in a simple Express.js application.

  
    const express = require('express');
    const logger = require('juggler-logger');
    
    const app = express();
    
    // Configure logger
    logger.configure({
      level: 'info',
      transports: [
        new logger.transports.Console(),
        new logger.transports.File({ filename: 'logs/app.log' })
      ]
    });
    
    app.use((req, res, next) => {
      logger.info('Incoming request', { method: req.method, url: req.url });
      next();
    });
    
    app.get('/', (req, res) => {
      logger.log('Handling root route');
      res.send('Hello world');
    });
    
    app.listen(3000, () => {
      logger.info('Server is running on port 3000');
    });
  

By using Juggler Logger in your application, you can easily keep track of various events and debug issues efficiently. The above example highlights the ease of integrating Juggler Logger with Express.js for comprehensive logging in web applications.

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