diff --git a/ngo/codec/serializer_json.go b/ngo/codec/serializer_json.go
deleted file mode 100644
index 69f63e7..0000000
--- a/ngo/codec/serializer_json.go
+++ /dev/null
@@ -1,25 +0,0 @@
-package codec
-
-import (
-	"encoding/json"
-	"git.noahlan.cn/noahlan/ntool/ndef"
-)
-
-type JsonSerializer struct {
-}
-
-func NewJsonSerializer() ndef.Serializer {
-	return &JsonSerializer{}
-}
-
-func (s *JsonSerializer) Marshal(v interface{}) ([]byte, error) {
-	marshal, err := json.Marshal(v)
-	if err != nil {
-		return nil, err
-	}
-	return marshal, nil
-}
-
-func (s *JsonSerializer) Unmarshal(data []byte, v interface{}) error {
-	return json.Unmarshal(data, v)
-}
diff --git a/njson/json.go b/njson/json.go
new file mode 100644
index 0000000..67d93d8
--- /dev/null
+++ b/njson/json.go
@@ -0,0 +1,75 @@
+package njson
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"strings"
+)
+
+// Marshal marshals v into json bytes.
+// see json.Marshal
+func Marshal(v any) ([]byte, error) {
+	return json.Marshal(v)
+}
+
+// MarshalStr marshals v into a string.
+func MarshalStr(v any) (string, error) {
+	data, err := Marshal(v)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
+}
+
+// MarshalStrSafe marshals v into a string.
+// return an empty string if an error occurred.
+func MarshalStrSafe(v any) string {
+	ret, _ := MarshalStr(v)
+	return ret
+}
+
+// Unmarshal data bytes into v.
+func Unmarshal(data []byte, v any) error {
+	decoder := json.NewDecoder(bytes.NewReader(data))
+	if err := unmarshalUseNumber(decoder, v); err != nil {
+		return formatError(string(data), err)
+	}
+
+	return nil
+}
+
+// UnmarshalFromStr unmarshal v from str.
+func UnmarshalFromStr(str string, v any) error {
+	decoder := json.NewDecoder(strings.NewReader(str))
+	if err := unmarshalUseNumber(decoder, v); err != nil {
+		return formatError(str, err)
+	}
+
+	return nil
+}
+
+// UnmarshalFromReader unmarshal v from reader.
+func UnmarshalFromReader(reader io.Reader, v any) error {
+	var buf strings.Builder
+	teeReader := io.TeeReader(reader, &buf)
+	decoder := json.NewDecoder(teeReader)
+	if err := unmarshalUseNumber(decoder, v); err != nil {
+		return formatError(buf.String(), err)
+	}
+
+	return nil
+}
+
+// unmarshalUseNumber 避免出现科学计算，如1e+100
+// 这是由于默认 unmarshal 时会将大于6位的数值类型使用 float64 解析
+// 同时也可以避免精度丢失 double -> float64 等
+func unmarshalUseNumber(decoder *json.Decoder, v any) error {
+	decoder.UseNumber()
+	return decoder.Decode(v)
+}
+
+func formatError(v string, err error) error {
+	return fmt.Errorf("string: `%s`, error: `%w`", v, err)
+}
diff --git a/njson/serializer.go b/njson/serializer.go
new file mode 100644
index 0000000..23e3c55
--- /dev/null
+++ b/njson/serializer.go
@@ -0,0 +1,24 @@
+package njson
+
+import (
+	"git.noahlan.cn/noahlan/ntool/ndef"
+)
+
+type JsonSerializer struct {
+}
+
+func NewJsonSerializer() ndef.Serializer {
+	return &JsonSerializer{}
+}
+
+func (s *JsonSerializer) Marshal(v any) ([]byte, error) {
+	marshal, err := Marshal(v)
+	if err != nil {
+		return nil, err
+	}
+	return marshal, nil
+}
+
+func (s *JsonSerializer) Unmarshal(data []byte, v any) error {
+	return Unmarshal(data, v)
+}