add rest package

body.go

@@ -0,0 +1,28 @@
+package rest
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+)
+
+// ReadRequestJSON reads the body of an HTTP request into a target reference.
+func ReadRequestJSON(req *http.Request, v any) error {
+	data, err := io.ReadAll(req.Body)
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal(data, v)
+}
+
+// WriteResponseJSON writes an HTTP response as JSON.
+func WriteResponseJSON(w http.ResponseWriter, statusCode int, data any) error {
+	b, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+	w.Header().Add("Content-Type", "application/json")
+	w.WriteHeader(statusCode)
+	w.Write(b)
+	return nil
+}