diff --git a/level/level.go b/level/level.go
index 975fa2f..883aa7d 100644
--- a/level/level.go
+++ b/level/level.go
@@ -1,16 +1,20 @@
 package level
 
 import (
+	"encoding"
 	"encoding/json"
-	"fmt"
 	"strings"
 )
 
 //go:generate stringer -type=Level -linecomment
 
 var (
-	_ json.Marshaler   = Level(0)
-	_ json.Unmarshaler = (*Level)(nil)
+	_ json.Marshaler             = Level(0)
+	_ json.Unmarshaler           = (*Level)(nil)
+	_ encoding.TextMarshaler     = Level(0)
+	_ encoding.TextUnmarshaler   = (*Level)(nil)
+	_ encoding.BinaryMarshaler   = Level(0)
+	_ encoding.BinaryUnmarshaler = (*Level)(nil)
 )
 
 // Level log.
@@ -18,9 +22,9 @@ type Level uint32
 
 // available log levels.
 const (
-	Emergency Level = iota // emergency
+	Emergency Level = iota // emerg
 	Alert                  // alert
-	Critical               // critical
+	Critical               // crit
 	Error                  // error
 	Warning                // warning
 	Notice                 // notice
@@ -28,15 +32,6 @@ const (
 	Debug                  // debug
 )
 
-func (l Level) MarshalJSON() ([]byte, error) {
-	b, err := json.Marshal(l.String())
-	if err != nil {
-		return nil, fmt.Errorf("marshal err: %w", err)
-	}
-
-	return b, nil
-}
-
 func (l Level) Is(level Level) bool {
 	return level == l
 }
@@ -45,13 +40,34 @@ func (l Level) Enabled(level Level) bool {
 	return l <= level
 }
 
+func (l Level) MarshalJSON() ([]byte, error) {
+	return []byte("\"" + l.String() + "\""), nil
+}
+
 func (l *Level) UnmarshalJSON(in []byte) error {
-	var v string
-	if err := json.Unmarshal(in, &v); err != nil {
-		return fmt.Errorf("unmarshal err: %w", err)
-	}
+	lvl := Parse(string(in[1 : len(in)-1]))
+	*l = lvl
+
+	return nil
+}
+
+func (l Level) MarshalText() ([]byte, error) {
+	return []byte(l.String()), nil
+}
+
+func (l *Level) UnmarshalText(in []byte) error {
+	lvl := Parse(string(in))
+	*l = lvl
+
+	return nil
+}
+
+func (l Level) MarshalBinary() ([]byte, error) {
+	return []byte(l.String()), nil
+}
 
-	lvl := Parse(v)
+func (l *Level) UnmarshalBinary(in []byte) error {
+	lvl := Parse(string(in))
 	*l = lvl
 
 	return nil
@@ -65,11 +81,11 @@ func Parse(lvl string) Level {
 		return Info
 	case "notice", "Notice", "NOTICE":
 		return Notice
-	case "warning", "Warning", "WARNING":
+	case "warning", "Warning", "WARNING", "warm", "Warm", "WARN":
 		return Warning
-	case "error", "Error", "ERROR":
+	case "error", "Error", "ERROR", "err", "Err", "ERR":
 		return Error
-	case "critical", "Critical", "CRITICAL":
+	case "critical", "Critical", "CRITICAL", "crit", "Crit", "CRIT":
 		return Critical
 	case "alert", "Alert", "ALERT":
 		return Alert
diff --git a/level/level_string.go b/level/level_string.go
index e384efa..128a46f 100644
--- a/level/level_string.go
+++ b/level/level_string.go
@@ -18,9 +18,9 @@ func _() {
 	_ = x[Debug-7]
 }
 
-const _Level_name = "emergencyalertcriticalerrorwarningnoticeinfodebug"
+const _Level_name = "emergalertcriterrorwarningnoticeinfodebug"
 
-var _Level_index = [...]uint8{0, 9, 14, 22, 27, 34, 40, 44, 49}
+var _Level_index = [...]uint8{0, 5, 10, 14, 19, 26, 32, 36, 41}
 
 func (i Level) String() string {
 	if i >= Level(len(_Level_index)-1) {
diff --git a/level/level_test.go b/level/level_test.go
new file mode 100644
index 0000000..d6b7b23
--- /dev/null
+++ b/level/level_test.go
@@ -0,0 +1,59 @@
+package level_test
+
+import (
+	"testing"
+
+	"gitoa.ru/go-4devs/log/level"
+)
+
+func TestMarshalJSON(t *testing.T) {
+	levels := map[level.Level]string{
+		level.Emergency: `"emerg"`,
+		level.Alert:     `"alert"`,
+		level.Critical:  `"crit"`,
+		level.Error:     `"error"`,
+		level.Warning:   `"warning"`,
+		level.Notice:    `"notice"`,
+		level.Info:      `"info"`,
+		level.Debug:     `"debug"`,
+	}
+
+	for level, expect := range levels {
+		actual, err := level.MarshalJSON()
+		if err != nil {
+			t.Errorf("%s got err: %s", level, err)
+			continue
+		}
+		if string(actual) != expect {
+			t.Errorf("%s got: %s expect: %s", level, actual, expect)
+		}
+	}
+}
+
+func TestUnmarshalJSON(t *testing.T) {
+	levels := map[level.Level][]string{
+		level.Emergency: {`"emerg"`, `"Emerg"`},
+		level.Alert:     {`"alert"`, `"ALERT"`},
+		level.Critical:  {`"crit"`, `"critical"`},
+		level.Error:     {`"error"`, `"ERR"`},
+		level.Warning:   {`"warning"`, `"Warning"`},
+		level.Notice:    {`"notice"`},
+		level.Info:      {`"info"`},
+		level.Debug:     {`"debug"`, `"DEBUG"`},
+	}
+
+	for expect, actuals := range levels {
+		for _, actual := range actuals {
+			var level level.Level
+			if err := level.UnmarshalJSON([]byte(actual)); err != nil {
+				t.Errorf("%s got err: %s", level, err)
+				continue
+			}
+
+			if !level.Is(expect) {
+				t.Errorf("%s got: %s expect: %s", actual, level, expect)
+			}
+
+		}
+	}
+}