Introduction to Vinyl Logger

Vinyl Logger is a powerful logging library for JavaScript applications. Utilizing this tool can significantly improve the way you handle logs across your application, making debugging and monitoring a much easier process. In this guide, we will explore various APIs provided by vinyl-logger along with code snippets to demonstrate their use.

Getting Started

First, you need to install the vinyl-logger package:

 npm install vinyl-logger 

Basic Usage

 import Logger from 'vinyl-logger'; const logger = new 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'); 

Custom Log Levels

By default, vinyl-logger comes with predefined log levels, but you can customize them:

 const logger = new Logger({
  levels: {
    verbose: 0,
    debug: 1,
    info: 2,
    warn: 3,
    error: 4,
    silent: -1
  }
});
logger.verbose('This is a verbose message'); 

Formatting Logs

Customize log message formatting for better clarity:

 const logger = new Logger({
  format: {
    level: 'uppercase',
    message: 'capitalize',
    timestamp: 'ISO'
  }
});
logger.info('info message with custom format'); 

Output Methods

Direct logs to different outputs, such as console or files:

 const fs = require('fs');
const logger = new Logger({
  output: {
    console: true,
    file: {
      path: './logs/app.log',
      level: 'info'
    }
  }
});
logger.info('This will be logged to both console and file'); 

Conditional Logging

Enable conditional logging based on your environment:

 const logger = new Logger({
  level: process.env.NODE_ENV === 'production' ? 'warn' : 'debug'
});
logger.debug('This will only log in development environment'); 

Creating an Application Example

Let’s create an example application that uses vinyl-logger to handle logging:

 import express from 'express'; import Logger from 'vinyl-logger';
const app = express(); const logger = new Logger({
  output: {
    console: true,
    file: {
      path: './logs/app.log',
      level: 'debug'
    }
  }
});
app.use((req, res, next) => {
  logger.info(`Request Method: ${req.method}, Request URL: ${req.url}`);
  next();
});
app.get('/', (req, res) => {
  logger.debug('Home route accessed');
  res.send('Hello, World!');
});
app.listen(3000, () => {
  logger.info('Server is running on port 3000');
});

In this example, we set up an Express application with vinyl-logger to log incoming requests and server activities. The logs are directed to the console and to a file for better traceability.

Consider using vinyl-logger in your JavaScript applications for efficient and structured logging. It offers flexibility and scalability to meet your logging needs.

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