pretty_slog Usage

A colorized slog handler with automatic source tracking for errors.

Installation

go get github.com/fl4vis/pretty_slog

Basic Usage

package main

import (
    "log/slog"
    "github.com/fl4vis/pretty_slog"
)

func main() {
    logger := slog.New(pretty_slog.NewHandler(&slog.HandlerOptions{
        Level:     slog.LevelDebug,
        AddSource: false, // Must be false for error-only source tracking
    }))
    
    slog.SetDefault(logger)
    
    slog.Debug("Debug message")
    slog.Info("Info message")
    slog.Warn("Warning message")
    slog.Error("Error message") // Only this shows source info
}

Important: AddSource Setting

Set AddSource: false when creating the handler. The handler automatically adds source information (file, line, function) only for ERROR level logs.

If you set AddSource: true, source information will appear on all log levels, which is usually not desired.

Example Output

[12:34:56.789] DEBUG: Debug message {}
[12:34:56.790] INFO: Info message {}
[12:34:56.791] WARN: Warning message {}
[12:34:56.792] ERROR: Error message {
  "source": {
    "file": "/path/to/main.go",
    "function": "main.main",
    "line": 18
  }
}

Features

• Color-coded log levels (DEBUG=gray, INFO=cyan, WARN=yellow, ERROR=red)
• Colorized JSON attribute output
• Automatic source tracking on errors only
• Clean, readable format with timestamps

Tests

 go test -v -run Visual
 go test -v -run Debug