feat: custom json marshaler implementation

pkg/json/encoder.go

@@ -0,0 +1,17 @@
+package json
+
+import "io"
+
+type Encoder struct {
+	w io.Writer
+}
+
+func NewEncoder(w io.Writer) *Encoder {
+	return &Encoder{w: w}
+}
+
+func (e *Encoder) Encode(v any) error {
+	data, _ := Marshal(v)
+	_, err := e.w.Write(data)
+	return err
+}