Go Structured Logger

A structured logging package for Go applications built on top of the standard library's slog package.

Features

• Built on Go's standard library: Uses slog from Go 1.21+
• Structured logging: Key-value pairs for better log filtering and analysis
• Multiple output formats: JSON for production, text for development
• Colored console output: Improves readability during local development
• Customizable log levels: debug, info, warn, error
• Source information: Automatically includes caller information (file:line)
• Global logger: Convenient access throughout your application
• Testing support: Mock logger for easy testing

Installation

go get github.com/legrch/logger

Quick Start

package main

import (
	"github.com/legrch/logger"
	"os"
)

func main() {
	// Initialize logger with default configuration
	cfg := &logger.Config{
		Level:           "info",
		Format:          "text",
		EnableColors:    true,
		EnableCaller:    true,
		CallerSkipFrame: 1,
	}
	
	log := logger.New(cfg)
	
	// Use the logger
	log.Info("application started", "version", "1.0.0")
	log.Debug("debug message") // Won't be shown with info level
	log.Error("something went wrong", "error", "connection refused", "retry", true)
	
	// With structured fields
	log.With("request_id", "abc123").Info("processing request")
	
	// Set as global logger
	logger.SetGlobal(log)
	
	// Use global logger elsewhere
	globalLogger := logger.Global()
	globalLogger.Info("using global logger")
}

Documentation

For detailed documentation, examples, and API reference, please visit:

• Package Documentation
• Examples

License

This project is licensed under the MIT License - see the LICENSE file for details.