diff --git a/package.json b/package.json
index b41b0c7..bbd9301 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@debros/network-ts-sdk",
-  "version": "0.6.1",
+  "version": "0.6.2",
   "description": "TypeScript SDK for DeBros Network Gateway - Database, PubSub, Cache, Storage, and more",
   "type": "module",
   "main": "./dist/index.js",
diff --git a/src/core/interfaces/IWebSocketClient.ts b/src/core/interfaces/IWebSocketClient.ts
index 5985234..98c1a53 100644
--- a/src/core/interfaces/IWebSocketClient.ts
+++ b/src/core/interfaces/IWebSocketClient.ts
@@ -41,12 +41,12 @@ export interface IWebSocketClient {
   /**
    * Register close handler
    */
-  onClose(handler: () => void): void;
+  onClose(handler: (code: number, reason: string) => void): void;
 
   /**
    * Unregister close handler
    */
-  offClose(handler: () => void): void;
+  offClose(handler: (code: number, reason: string) => void): void;
 
   /**
    * Check if WebSocket is connected
diff --git a/src/core/ws.ts b/src/core/ws.ts
index 4f69baf..bbd3149 100644
--- a/src/core/ws.ts
+++ b/src/core/ws.ts
@@ -16,7 +16,7 @@ export interface WSClientConfig {
 
 export type WSMessageHandler = (data: string) => void;
 export type WSErrorHandler = (error: Error) => void;
-export type WSCloseHandler = () => void;
+export type WSCloseHandler = (code: number, reason: string) => void;
 export type WSOpenHandler = () => void;
 
 /**
@@ -102,7 +102,12 @@ export class WSClient {
         this.ws.addEventListener("error", (event: Event) => {
           console.error("[WSClient] WebSocket error:", event);
           clearTimeout(timeout);
-          const error = new SDKError("WebSocket error", 500, "WS_ERROR", event);
+          // Extract useful details from the event — raw Event objects don't serialize
+          const details: Record<string, any> = { type: event.type };
+          if ("message" in event) {
+            details.message = (event as ErrorEvent).message;
+          }
+          const error = new SDKError("WebSocket error", 0, "WS_ERROR", details);
 
           // Call the network error callback if configured
           if (this.onNetworkError) {
@@ -118,10 +123,13 @@ export class WSClient {
           reject(error);
         });
 
-        this.ws.addEventListener("close", () => {
+        this.ws.addEventListener("close", (event: Event) => {
           clearTimeout(timeout);
-          console.log("[WSClient] Connection closed");
-          this.closeHandlers.forEach((handler) => handler());
+          const closeEvent = event as CloseEvent;
+          const code = closeEvent.code ?? 1006;
+          const reason = closeEvent.reason ?? "";
+          console.log(`[WSClient] Connection closed (code: ${code}, reason: ${reason || "none"})`);
+          this.closeHandlers.forEach((handler) => handler(code, reason));
         });
       } catch (error) {
         reject(error);
@@ -206,7 +214,7 @@ export class WSClient {
    */
   send(data: string): void {
     if (this.ws?.readyState !== WebSocket.OPEN) {
-      throw new SDKError("WebSocket is not connected", 500, "WS_NOT_CONNECTED");
+      throw new SDKError("WebSocket is not connected", 0, "WS_NOT_CONNECTED");
     }
     this.ws.send(data);
   }
diff --git a/src/pubsub/client.ts b/src/pubsub/client.ts
index 87cdd29..0fcfb62 100644
--- a/src/pubsub/client.ts
+++ b/src/pubsub/client.ts
@@ -176,7 +176,7 @@ export class Subscription {
   private isClosed = false;
   private wsMessageHandler: ((data: string) => void) | null = null;
   private wsErrorHandler: ((error: Error) => void) | null = null;
-  private wsCloseHandler: (() => void) | null = null;
+  private wsCloseHandler: ((code: number, reason: string) => void) | null = null;
   private getPresenceFn: () => Promise<PresenceResponse>;
 
   constructor(
@@ -271,8 +271,8 @@ export class Subscription {
     this.wsClient.onError(this.wsErrorHandler);
 
     // Register close handler
-    this.wsCloseHandler = () => {
-      this.closeHandlers.forEach((handler) => handler());
+    this.wsCloseHandler = (code: number, reason: string) => {
+      this.closeHandlers.forEach((handler) => handler(code, reason));
     };
     this.wsClient.onClose(this.wsCloseHandler);
   }
diff --git a/src/pubsub/types.ts b/src/pubsub/types.ts
index 304a273..6365f51 100644
--- a/src/pubsub/types.ts
+++ b/src/pubsub/types.ts
@@ -42,5 +42,5 @@ export interface SubscribeOptions {
 
 export type MessageHandler = (message: PubSubMessage) => void;
 export type ErrorHandler = (error: Error) => void;
-export type CloseHandler = () => void;
+export type CloseHandler = (code: number, reason: string) => void;