Introduction to babel-logger

Babel-logger is a versatile and powerful logging library for JavaScript applications. It allows developers to easily log messages in different formats, manage log levels, and integrate with various transports such as console, file, and remote servers. In this article, we’ll explore some of the most useful APIs provided by babel-logger and demonstrate their usage through practical code snippets.

Basic Configuration

To get started with babel-logger, you need to install the library and set up a basic configuration.

  // Install babel-logger npm install babel-logger
// Import babel-logger const logger = require('babel-logger');
// Basic configuration logger.configure({
    level: 'info',
    transports: [
        new logger.transports.Console(),
        new logger.transports.File({ filename: 'application.log' })
    ]
});
// Logging messages logger.info('This is an info message'); logger.warn('This is a warning message'); logger.error('This is an error message');  

Advanced Configuration

Babel-logger allows for advanced configuration, including custom formats and multiple transports.

  const { createLogger, format, transports } = require('babel-logger'); const { combine, timestamp, printf } = format;
const customFormat = printf(({ level, message, timestamp }) => {
    return `${timestamp} [${level.toUpperCase()}]: ${message}`;
});
const logger = createLogger({
    level: 'debug',
    format: combine(
        timestamp(),
        customFormat
    ),
    transports: [
        new transports.Console(),
        new transports.File({ filename: 'custom.log' })
    ]
});
logger.debug('Debugging information'); logger.info('Informational message');  

Using Custom Transports

You can create and use custom transports to send log messages to different destinations.

  class CustomTransport extends logger.Transport {
    log(info, callback) {
        // Custom logic to handle log messages
        console.log('Custom transport log:', info);
        callback();
    }
}
logger.add(new CustomTransport());
logger.info('This is logged using a custom transport');  

Integration Example: Express.js App

Here’s an example of how you can integrate babel-logger into an Express.js application.

  const express = require('express'); const logger = require('babel-logger');
const app = express(); const port = 3000;
// Configure babel-logger logger.configure({
    level: 'info',
    transports: [
        new logger.transports.Console(),
        new logger.transports.File({ filename: 'app.log' })
    ]
});
app.use((req, res, next) => {
    logger.info(\`Request URL: \${req.url}\`);
    next();
});
app.get('/', (req, res) => {
    logger.debug('Handling GET /');
    res.send('Hello World!');
});
app.listen(port, () => {
    logger.info(\`App listening at http://localhost:\${port}\`);
});  

With these examples, you can start leveraging the power of babel-logger in your JavaScript applications, making logging more efficient and insightful.

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