diff --git a/srcs/requirements/nestjs/api_back/src/chat/chat.service.ts b/srcs/requirements/nestjs/api_back/src/chat/chat.service.ts
index 0842a6d3..aa0e6b51 100644
--- a/srcs/requirements/nestjs/api_back/src/chat/chat.service.ts
+++ b/srcs/requirements/nestjs/api_back/src/chat/chat.service.ts
@@ -25,6 +25,18 @@ export class ChatService {
 		return new Promise(resolve => setTimeout(resolve, ms));
 	}
 
+	private format_room(room: Chatroom)
+	{
+		let new_room: roomDto = {
+			name: room.name,
+			type: room.type,
+			owner: room.owner,
+			users: room.users,
+		};
+
+		return new_room;
+	}
+
 
 	/* GETTERS ************************************************
 	*/
@@ -222,7 +234,7 @@ export class ChatService {
 		this.chatroomRepository.save(room);
 
 		console.log("-- out addUserToRoom service");
-		return room;
+		return this.format_room(room);
 	}
 
 	async addMessageToRoom(room_name: string, username: string, message: string): Promise<void>