diff --git a/errors.go b/errors.go
new file mode 100644
index 0000000..afd6f8a
--- /dev/null
+++ b/errors.go
@@ -0,0 +1,10 @@
+package jsonint
+
+import (
+	"sourcecode.social/reiver/go-erorr"
+)
+
+const (
+	errNilReceiver                  = erorr.Error("jsonint: nil receiver")
+	errCannotMarshalNothingIntoJSON = erorr.Error("jsonint: cannot marshal jsonint.Nothing() into JSON")
+)
diff --git a/int.go b/int.go
new file mode 100644
index 0000000..2f5dc49
--- /dev/null
+++ b/int.go
@@ -0,0 +1,59 @@
+package jsonint
+
+import (
+	"encoding/json"
+	"strconv"
+
+	"sourcecode.social/reiver/go-erorr"
+	"sourcecode.social/reiver/go-opt"
+)
+
+var _ json.Marshaler = Int{}
+var _ json.Unmarshaler = new(Int)
+
+type Int struct {
+	value opt.Optional[string]
+}
+
+func Nothing() Int {
+	return Int{}
+}
+
+func Int64(value int64) Int {
+	return Int{
+		value: opt.Something(strconv.FormatInt(value, 10)),
+	}
+}
+
+func Uint64(value uint64) Int {
+	return Int{
+		value: opt.Something(strconv.FormatUint(value, 10)),
+	}
+}
+
+func (receiver Int) Get() (string, bool) {
+	return receiver.value.Get()
+}
+
+func (receiver Int) MarshalJSON() ([]byte, error) {
+	value, found := receiver.value.Get()
+	if !found {
+		return nil, errCannotMarshalNothingIntoJSON
+	}
+
+	return []byte(value), nil
+}
+
+func (receiver *Int) UnmarshalJSON(data []byte) error {
+	if nil == receiver {
+		return errNilReceiver
+	}
+
+	if !isNumeric(data) {
+		return erorr.Errorf("jsonint: cannot unmarshal %q into value of type %T", data, Int{})
+	}
+
+	receiver.value = opt.Something(string(data))
+
+	return nil
+}