Introduction to bs-logger

bs-logger is a powerful and flexible logging library for JavaScript applications. It provides a variety of APIs to create, customize, and manage logs seamlessly.

Getting Started

First, you need to install the bs-logger library in your project:

npm install bs-logger

Creating a Basic Logger

You can create a basic logger using the following code snippet:

 const { createLogger } = require('bs-logger') const logger = createLogger({ context: { service: 'my-service' } }) logger.info('Logger initialized') 

Logger Levels

bs-logger supports multiple logging levels like info, warn, error, etc.:

 logger.info('This is an info message') logger.warn('This is a warning message') logger.error('This is an error message') 

Custom Transports

You can define custom transports to send logs to different destinations:

 const { createLogger, format, transports } = require('bs-logger') const logger = createLogger({
  format: format.combine(
    format.colorize(),
    format.printf(({ level, message }) => `${level}: ${message}`)
  ),
  transports: [
    new transports.Console(),
    new transports.File({ filename: 'combined.log' })
  ]
}) logger.info('Custom transport example') 

Logging with Context

Contextual logging allows you to add metadata to your logs:

 const logger = createLogger({ context: { userId: '12345' } }) logger.info('User logged in') 

Async Logging

bs-logger also supports asynchronous logging:

 logger.info({ async: true, message: 'Async log example' }) 

End-to-End Application Example

Here is a full example of a simple Node.js application using bs-logger:

 const { createLogger, format, transports } = require('bs-logger')
const logger = createLogger({
  format: format.combine(
    format.colorize(),
    format.timestamp(),
    format.printf(({ timestamp, level, message }) => `${timestamp} ${level}: ${message}`)
  ),
  transports: [
    new transports.Console(),
    new transports.File({ filename: 'app.log' })
  ]
})
const express = require('express') const app = express() const port = 3000
app.get('/', (req, res) => {
  logger.info('Received a request')
  res.send('Hello, World!')
})
app.listen(port, () => {
  logger.info(`Server running on port ${port}`)
}) 

This application sets up an Express server and logs every request it receives.

For further information, refer to the official bs-logger documentation.

Happy logging!

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