diff --git a/lib/helpers.ts b/lib/helpers.ts
index 973a353..a6e3ccf 100644
--- a/lib/helpers.ts
+++ b/lib/helpers.ts
@@ -5,23 +5,23 @@ import { PATH_METADATA } from '@nestjs/common/constants';
 import { Controller } from '@nestjs/common/interfaces/controllers/controller.interface';
 
 import { BadRequestException } from '@nestjs/common';
-import { ControllerMethod } from './interfaces';
+import { ControllerMethod, Query, Params } from './interfaces';
 
 export function generateUrl(
   appUrl: string,
   prefix: string,
   relativePath: string,
-  query: any = {},
-  params: any = {},
+  query?: Query,
+  params?: Params,
 ): string {
   relativePath = putParamsInUrl(relativePath, params);
   const path = joinRoutes(appUrl, prefix, relativePath);
   const queryString = stringifyQuery(query);
-  const fullPath = appendQueryParams(path, queryString);
+  const fullPath = appendQuery(path, queryString);
   return fullPath;
 }
 
-export function stringifyQuery(query: Record<string, unknown>): string {
+export function stringifyQuery(query?: Query): string {
   return qsStringify(query);
 }
 
@@ -53,18 +53,11 @@ export function signatureHasExpired(expirationDate: Date): boolean {
   return currentDate > expirationDate;
 }
 
-export function isObjectEmpty(obj = {}): boolean {
-  return Object.keys(obj).length == 0;
-}
-
 function isRouteNotEmpty(route: string): boolean {
   return !!route && route !== '/';
 }
 
-function isParamsNameInUrl(
-  route: string,
-  params: Record<string, string>,
-): boolean {
+function isParamsNameInUrl(route: string, params: Params): boolean {
   const routeParts = route
     .split('/')
     .filter((path) => path[0] === ':')
@@ -79,14 +72,14 @@ function joinRoutes(...routes: string[]): string {
   return routes.filter((route) => isRouteNotEmpty(route)).join('/');
 }
 
-function appendQueryParams(route: string, query: string): string {
+export function appendQuery(route: string, query: string): string {
   if (query) {
     return `${route}?${query}`;
   }
   return route;
 }
 
-function putParamsInUrl(route: string, params: Record<string, string>): string {
+function putParamsInUrl(route: string, params?: Params): string {
   if (params) {
     if (isParamsNameInUrl(route, params)) {
       for (const [key, value] of Object.entries(params)) {
diff --git a/lib/interfaces.ts b/lib/interfaces.ts
index c9da70e..19a7643 100644
--- a/lib/interfaces.ts
+++ b/lib/interfaces.ts
@@ -3,10 +3,10 @@ import { Controller } from '@nestjs/common/interfaces/controllers/controller.int
 
 export type ControllerMethod = (...args: any[]) => Promise<any> | any;
 
-interface Query {
+export interface Query {
   [key: string]: any;
 }
-interface Params {
+export interface Params {
   [key: string]: string;
 }
 
diff --git a/lib/url-generator.service.ts b/lib/url-generator.service.ts
index 76a56ec..1b70629 100644
--- a/lib/url-generator.service.ts
+++ b/lib/url-generator.service.ts
@@ -1,11 +1,5 @@
 import { ApplicationConfig } from '@nestjs/core';
-import {
-  Inject,
-  Injectable,
-  Logger,
-  ForbiddenException,
-  ConflictException,
-} from '@nestjs/common';
+import { Inject, Injectable, Logger, ForbiddenException } from '@nestjs/common';
 
 import { UrlGeneratorModuleOptions } from './url-generator-options.interface';
 import { URL_GENERATOR_MODULE_OPTIONS } from './url-generator.constants';
@@ -17,7 +11,7 @@ import {
   isSignatureEqual,
   stringifyQuery,
   generateUrl,
-  isObjectEmpty,
+  appendQuery,
 } from './helpers';
 
 import {
@@ -108,7 +102,7 @@ export class UrlGeneratorService {
   public signUrl({
     relativePath,
     expirationDate,
-    query,
+    query = {}, // empty object avoid undefined error
     params,
   }: SignUrlArgs): string {
     const mappedQuery = query as ReservedQuery;
@@ -147,14 +141,11 @@ export class UrlGeneratorService {
   }: IsSignatureValidArgs): boolean {
     const { signed, ...restQuery } = query;
 
+    const path = `${protocol}://${host}${routePath}`;
     const queryString = stringifyQuery(restQuery);
+    const fullPath = appendQuery(path, queryString);
 
-    let fullUrl = `${protocol}://${host}${routePath}`;
-    if (!isObjectEmpty(restQuery)) {
-      fullUrl += `?${queryString}`;
-    }
-
-    const hmac = generateHmac(fullUrl, this.urlGeneratorModuleOptions.secret);
+    const hmac = generateHmac(fullPath, this.urlGeneratorModuleOptions.secret);
 
     if (!signed || !hmac || signed.length != hmac.length) {
       throw new ForbiddenException('Invalid Url');