diff --git a/core/ylog/logger.go b/core/ylog/logger.go
index e44bb997a..c4805bd11 100644
--- a/core/ylog/logger.go
+++ b/core/ylog/logger.go
@@ -64,7 +64,7 @@ type Config struct {
 
 	// Format supports text and json,
 	// The default is text.
-	Format string `env:"YOMO_LOG_FORMAT" envDefault:"text"`
+	Format string `env:"YOMO_LOG_FORMAT" envDefault:""`
 
 	// MaxSize is the maximum size in megabytes of the log file before it gets rotated.
 	// It defaults to 100 megabytes.
diff --git a/core/ylog/logger_test.go b/core/ylog/logger_test.go
index 6b43fb3fc..605a01b57 100644
--- a/core/ylog/logger_test.go
+++ b/core/ylog/logger_test.go
@@ -37,13 +37,13 @@ func TestLogger(t *testing.T) {
 
 	assert.NoError(t, err)
 	assert.FileExists(t, output)
-	assert.Equal(t, "level=INFO msg=\"some info\" hello=yomo\nlevel=WARN msg=\"some waring\" hello=yomo\n", string(log))
+	assert.Equal(t, "\x1b[92mINF\x1b[0m some info \x1b[2mhello=\x1b[0myomo\n\x1b[93mWRN\x1b[0m some waring \x1b[2mhello=\x1b[0myomo\n", string(log))
 
 	errlog, err := os.ReadFile(errOutput)
 
 	assert.NoError(t, err)
 	assert.FileExists(t, errOutput)
-	assert.Equal(t, "level=ERROR msg=error err=EOF hello=yomo\n", string(errlog))
+	assert.Equal(t, "\x1b[91mERR\x1b[0m error \x1b[2merr=\x1b[0mEOF \x1b[2mhello=\x1b[0myomo\n", string(errlog))
 
 	os.Remove(output)
 	os.Remove(errOutput)
diff --git a/core/ylog/slog_handler.go b/core/ylog/slog_handler.go
index 193fbf80f..f8cf3e653 100644
--- a/core/ylog/slog_handler.go
+++ b/core/ylog/slog_handler.go
@@ -9,6 +9,9 @@ import (
 	"os"
 	"strings"
 	"sync"
+	"time"
+
+	"github.com/lmittmann/tint"
 )
 
 // handler supports splitting log stream to common log stream and error log stream.
@@ -126,10 +129,19 @@ func bufferedSlogHandler(buf io.Writer, format string, level slog.Level, verbose
 	}
 
 	var h slog.Handler
-	if strings.ToLower(format) == "json" {
+	format = strings.ToLower(format)
+	switch format {
+	case "json":
 		h = slog.NewJSONHandler(buf, opt)
-	} else {
+	case "text":
 		h = slog.NewTextHandler(buf, opt)
+	default:
+		h = tint.NewHandler(buf, &tint.Options{
+			AddSource:   verbose,
+			Level:       level,
+			ReplaceAttr: opt.ReplaceAttr,
+			TimeFormat:  time.Kitchen,
+		})
 	}
 
 	return h
diff --git a/go.mod b/go.mod
index 6628d3f95..56e85714e 100644
--- a/go.mod
+++ b/go.mod
@@ -11,6 +11,7 @@ require (
 	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/invopop/jsonschema v0.12.0
 	github.com/joho/godotenv v1.5.1
+	github.com/lmittmann/tint v1.0.4
 	github.com/matoous/go-nanoid/v2 v2.1.0
 	github.com/quic-go/quic-go v0.44.0
 	github.com/reactivex/rxgo/v2 v2.5.0
diff --git a/go.sum b/go.sum
index 872d6927c..752aacf8f 100644
--- a/go.sum
+++ b/go.sum
@@ -106,6 +106,8 @@ github.com/kr/pty v1.1.3/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/lmittmann/tint v1.0.4 h1:LeYihpJ9hyGvE0w+K2okPTGUdVLfng1+nDNVR4vWISc=
+github.com/lmittmann/tint v1.0.4/go.mod h1:HIS3gSy7qNwGCj+5oRjAutErFBl4BzdQP6cJZ0NfMwE=
 github.com/lufia/plan9stats v0.0.0-20240513124658-fba389f38bae h1:dIZY4ULFcto4tAFlj1FYZl8ztUZ13bdq+PLY+NOfbyI=
 github.com/lufia/plan9stats v0.0.0-20240513124658-fba389f38bae/go.mod h1:ilwx/Dta8jXAgpFYFvSWEMwxmbWXyiUHkd5FwyKhb5k=
 github.com/lunixbochs/vtclean v1.0.0/go.mod h1:pHhQNgMf3btfWnGBVipUOjRYhoOsdGqdm/+2c2E2WMI=