Improve the validation error message (#428)

Current it doesn't show what fields has errors

Author: minhtungo

src/common/utils/httpHandlers.ts

@@ -9,9 +9,18 @@ export const validateRequest = (schema: ZodSchema) => async (req: Request, res:
 		await schema.parseAsync({ body: req.body, query: req.query, params: req.params });
 		next();
 	} catch (err) {
-		const errorMessage = `Invalid input: ${(err as ZodError).errors.map((e) => e.message).join(", ")}`;
-		const statusCode = StatusCodes.BAD_REQUEST;
-		const serviceResponse = ServiceResponse.failure(errorMessage, null, statusCode);
-		res.status(serviceResponse.statusCode).send(serviceResponse);
+	    const errors = (err as ZodError).errors.map((e) => {
+	      const fieldPath = e.path.length > 0 ? e.path.join('.') : 'root';
+	      return `${fieldPath}: ${e.message}`;
+	    });
+	
+	    const errorMessage =
+	      errors.length === 1
+	        ? `Invalid input: ${errors[0]}`
+	        : `Invalid input (${errors.length} errors): ${errors.join('; ')}`;
+	
+	    const statusCode = HTTP_STATUS_CODES.BAD_REQUEST;
+	    const serviceResponse = ServiceResponse.failure(errorMessage, null, statusCode);
+	    res.status(serviceResponse.statusCode).send(serviceResponse);
 	}
 };