test safeStringify

src/interfaces/utils.ts

@@ -27,8 +27,8 @@ export function setLogDataDiff(req: RequestWithUser, data: DataDiff) {
     typeof data.after === "object"
   ) {
     req.app.locals.logData.dataDiff = {
-      before: JSON.stringify(data.before),
-      after: JSON.stringify(data.after),
+      before: safeStringify(data.before),
+      after: safeStringify(data.after),
     };
   } else {
     console.error("Invalid data provided: both before and after must be valid objects.");
@@ -45,3 +45,33 @@ export function addLogSequence(req: RequestWithUser, data: LogSequence) {
 export function editLogSequence(req: RequestWithUser, index: number, data: LogSequence) {
   req.app.locals.logData.sequence[index] = data;
 }
+
+/**
+ * ปลอดภัยกว่า JSON.stringify()
+ * - กัน circular reference
+ * - จำกัดความลึก
+ * - return string แน่นอนเสมอ
+ */
+export function safeStringify(obj: any, space?: number): string {
+  const cache = new WeakSet();
+
+  try {
+    return JSON.stringify(
+      obj,
+      (key, value) => {
+        // ป้องกัน circular reference
+        if (typeof value === "object" && value !== null) {
+          if (cache.has(value)) {
+            return "[Circular]";
+          }
+          cache.add(value);
+        }
+        return value;
+      },
+      space,
+    );
+  } catch (err) {
+    console.error("⚠️ safeStringify error:", err);
+    return "[Unserializable object]";
+  }
+}