Focus Logger – The Ultimate Logging Library for Improved Code Efficiency

Introduction to Focus Logger

Focus Logger is a powerful and flexible logging library designed to enhance your JavaScript and Node.js applications. It allows developers to output logs in various formats, manage log levels, and provides dozens of useful APIs to cater to various logging needs.

API Examples

Basic Usage

const { createLogger, transports, format } = require('focus-logger');

const logger = createLogger({
   level: 'info',
   format: format.combine(
     format.timestamp(),
     format.json()
   ),
   transports: [
     new transports.Console(),
     new transports.File({ filename: 'combined.log' })
   ]
});

logger.info("Hello, Focus Logger!");

Custom Levels

const customLevels = {
   levels: {
     error: 0,
     warning: 1,
     info: 2,
     debug: 3
   },
   colors: {
     error: 'red',
     warning: 'yellow',
     info: 'green',
     debug: 'blue'
   }
};

const customLogger = createLogger({
   levels: customLevels.levels,
   transports: [new transports.Console({ format: format.colorize({ all: true }) })]
});

customLogger.debug("This is a debug message");

Logging HTTP Requests

const express = require('express');
const app = express();

app.use((req, res, next) => {
   logger.info(`${req.method} ${req.url}`);
   next();
});

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

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

Customizing Formats

const myLogger = createLogger({
   format: format.combine(
     format.label({ label: 'custom-label' }),
     format.timestamp(),
     format.printf(({ level, message, label, timestamp }) => {
       return `${timestamp} [${label}] ${level}: ${message}`;
     })
   ),
   transports: [new transports.Console()]
});

myLogger.error('This is a custom formatted error message');

Using External Transports

const { ElasticsearchTransport } = require('focus-logger-elasticsearch');

const esTransport = new ElasticsearchTransport({
   level: 'info',
   clientOpts: { node: 'http://localhost:9200' }
});

const esLogger = createLogger({
   transports: [esTransport]
});

esLogger.info('This message is sent to Elasticsearch');

Complete Application Example

const express = require('express');
const { createLogger, transports, format } = require('focus-logger');
const app = express();

const logger = createLogger({
   level: 'info',
   format: format.combine(
     format.timestamp(),
     format.json()
   ),
   transports: [
     new transports.Console(),
     new transports.File({ filename: 'app.log' })
   ]
});

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

app.get('/', (req, res) => {
   res.send('Welcome to the Focus Logger App!');
});

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

Focus Logger is highly customizable and can be enhanced with external transports like Elasticsearch, providing flexibility and power unmatched by simpler logging libraries.

Don’t miss out on leveraging Focus Logger to enhance your development workflow!

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