Introduction to js-logger

Welcome to the ultimate guide on js-logger, an efficient and lightweight logging library used for logging in JavaScript applications. Whether you’re building robust production systems or experimenting with pet projects, js-logger is the go-to tool for logging and debugging.

Getting Started with js-logger

First, you need to include the library in your project. You can install it using npm:

npm install js-logger

Basic Usage

Here’s how to get started with basic logging:

import Logger from 'js-logger';

 // Initializing the logger
 Logger.useDefaults();

 // Logging messages
 Logger.info('This is an info log!');
 Logger.warn('This is a warning!');
 Logger.error('This is an error log!');

Customizing Log Output

Customize the log output by configuring js-logger:

Logger.useDefaults({
  defaultLevel: Logger.DEBUG,
  formatter: (messages, context) => {
    messages.unshift(new Date().toISOString());
  }
});

 // Testing the custom log formatter
 Logger.debug('Debugging info with a timestamp');

Using Custom Handlers

Create your own custom handlers:

const customHandler = (messages, context) => {
  // Custom handling logic
  console.log('Custom Handler:', messages, context);
};

 Logger.setHandler(customHandler);
 Logger.info('Logging with a custom handler');

Advanced Topics

Delving deeper into advanced functionality:

// Creating named loggers
const appLogger = Logger.get('app');
const dbLogger = Logger.get('database');

 // Using named loggers
 appLogger.info('App-specific log');
 dbLogger.info('Database-specific log');

App Example with js-logger

Here’s an example of a simple app utilizing js-logger:

// logger-config.js
import Logger from 'js-logger';

 // Initialize default logging
 Logger.useDefaults();

 // Create named loggers
 export const appLogger = Logger.get('app');
 export const dbLogger = Logger.get('database');

 // index.js
 import { appLogger, dbLogger } from './logger-config';

 // Simulating application logs
 appLogger.info('Application started');
 dbLogger.info('Database connected');

 try {
   // Some operation
   appLogger.debug('Running a debug operation');
 } catch (err) {
   appLogger.error('An error occurred:', err);
 }

With these configurations and usages, your logging strategy can be thoroughly integrated, providing insights and debugging help as needed.

Explore js-logger to streamline your logging and enhance your debugging experience in JavaScript applications!

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