Welcome to the Comprehensive Guide to hasbin-logger

hasbin-logger is an advanced logging framework that facilitates a robust way to log different levels of information in your applications. It is highly customizable and can be easily integrated into various application environments. Here, we will explore the numerous APIs offered by hasbin-logger through dozens of examples to give you a head start in implementing this powerful logging tool.

Getting Started with hasbin-logger

To begin using hasbin-logger, you need to install it via npm:

npm install hasbin-logger

Basic Usage

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

  const logger = require('hasbin-logger');
  logger.info('This is an info message');
  logger.warn('This is a warning message');
  logger.error('This is an error message');

API Examples

Let’s delve into the various APIs available:

Setting Log Levels

  logger.setLevel('info');
  logger.debug('This message will not be logged');
  logger.info('This message will be logged');

Log with Metadata

  logger.info('User login', { userId: 123 });
  logger.error('Error fetching user data', { userId: 123, error: 'Not Found' });

Custom Log Transports

You can also customize the transports to define where your logs should be sent:

  const { ConsoleTransport, FileTransport } = require('hasbin-logger/transports');
  logger.addTransport(new ConsoleTransport());
  logger.addTransport(new FileTransport({ filename: 'app.log' }));
  
  logger.info('This message will be logged to both console and file');

Formatted Logging

Format your logs for better readability:

  logger.setFormatter(message => `[${new Date().toISOString()}] ${message}`);
  logger.info('This is a formatted log message');

Application Example

Here’s a simple app to demonstrate the use of the hasbin-logger:

  const logger = require('hasbin-logger');
  const { ConsoleTransport, FileTransport } = require('hasbin-logger/transports');
  
  logger.addTransport(new ConsoleTransport());
  logger.addTransport(new FileTransport({ filename: 'app.log' }));
  logger.setLevel('info');
  logger.setFormatter(message => `[${new Date().toISOString()}] ${message}`);

  function main() {
    logger.info('Application started');
    
    try {
      // Simulate some processing
      const result = processTask();
      logger.info('Process completed successfully', { result });
    } catch (error) {
      logger.error('An error occurred', { error });
    }

    logger.info('Application finished');
  }

  function processTask() {
    // Simulating processing that may fail
    if (Math.random() > 0.5) {
      throw new Error('Unexpected processing error');
    }
    return { status: 'success' };
  }

  main();

This example application uses the hasbin-logger to log different levels of messages in a formatted manner and transports the logs to the console and a log file.

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