go get github.com/samber/slog-zap/v2

type Option struct {
  // log level (default: debug)
  Level slog.Leveler

  // optional: zap logger (default: zap.L())
  Logger *zap.Logger

  // optional: customize json payload builder
  Converter Converter
  // optional: fetch attributes from context
  AttrFromContext []func(ctx context.Context) []slog.Attr

  // optional: see slog.HandlerOptions
  AddSource   bool
  ReplaceAttr func(groups []string, a slog.Attr) slog.Attr
}

slogzap.SourceKey = "source"
slogzap.ErrorKeys = []string{"error", "err"}
slogzap.LogLevels = map[slog.Level]zapcore.Level{...}

import (
    slogzap "github.com/samber/slog-zap/v2"
    "go.uber.org/zap"
    "log/slog"
)

func main() {
    zapLogger, _ := zap.NewProduction()

    logger := slog.New(slogzap.Option{Level: slog.LevelDebug, Logger: zapLogger}.NewZapHandler())
    logger = logger.
        With("environment", "dev").
        With("release", "v1.0.0")

    // log error
    logger.
        With("category", "sql").
        With("query.statement", "SELECT COUNT(*) FROM users;").
        With("query.duration", 1*time.Second).
        With("error", fmt.Errorf("could not count users")).
        Error("caramba!")

    // log user signup
    logger.
        With(
            slog.Group("user",
                slog.String("id", "user-123"),
                slog.Time("created_at", time.Now()),
            ),
        ).
        Info("user registration")
}

import (
	slogzap "github.com/samber/slog-zap"
	slogotel "github.com/samber/slog-otel"
	"go.opentelemetry.io/otel/sdk/trace"
)

func main() {
	tp := trace.NewTracerProvider(
		trace.WithSampler(trace.AlwaysSample()),
	)
	tracer := tp.Tracer("hello/world")

	ctx, span := tracer.Start(context.Background(), "foo")
	defer span.End()

	span.AddEvent("bar")

	logger := slog.New(
		slogzap.Option{
			// ...
			AttrFromContext: []func(ctx context.Context) []slog.Attr{
				slogotel.ExtractOtelAttrFromContext([]string{"tracing"}, "trace_id", "span_id"),
			},
		}.NewZapHandler(),
	)

	logger.ErrorContext(ctx, "a message")
}

# Install some dev dependencies
make tools

# Run tests
make test
# or
make watch-test