Introduction to loader.js-logger

loader.js-logger is a robust and easy-to-utilize logging library for JavaScript, designed to improve your debugging and monitoring capabilities. This guide will walk you through various APIs provided by loader.js-logger with practical examples to enhance your productivity. Let’s dive in!

Installing loader.js-logger

  
  npm install loader.js-logger
  

Basic Usage

  
  const logger = require('loader.js-logger');
  
  logger.log('info', 'This is an info message');
  logger.log('warn', 'This is a warning message');
  logger.log('error', 'This is an error message');
  

Setting Log Levels

  
  const logger = require('loader.js-logger');

  logger.setLevel('debug');
  logger.log('debug', 'This is a debug message');
  

Logging JSON Objects

  
  const logger = require('loader.js-logger');

  let user = { id: 1, name: 'Jane Doe' };
  logger.log('info', 'User Info:', JSON.stringify(user));
  

Custom Logger Configuration

  
  const logger = require('loader.js-logger');

  logger.configure({
    level: 'verbose',
    timestamp: true,
    colorize: true
  });

  logger.log('verbose', 'This is a verbose log with custom configuration');
  

Logging with Context

  
  const logger = require('loader.js-logger');

  const requestContext = { requestId: 'abc123' };
  logger.log('info', 'Request received', requestContext);
  

Logging Methods

  
  const logger = require('loader.js-logger');

  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');
  

Application Example

  
  const logger = require('loader.js-logger');
  const express = require('express');
  const app = express();

  app.use((req, res, next) => {
    logger.info('Incoming request:', { method: req.method, url: req.url });
    next();
  });

  app.get('/', (req, res) => {
    res.send('Hello World!');
    logger.info('Response sent');
  });

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

By incorporating loader.js-logger into your applications, you can significantly enhance your logging capabilities and simplify the debugging process.

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