diff --git a/src/app.controller.ts b/src/app.controller.ts
new file mode 100644
index 0000000..e748170
--- /dev/null
+++ b/src/app.controller.ts
@@ -0,0 +1,15 @@
+import { Controller, Get, UseGuards } from "@nestjs/common";
+import { ApiBearerAuth } from "@nestjs/swagger";
+import { JwtAuthGuard } from "./modules/auth/guards/jwt.guard";
+
+@Controller()
+@ApiBearerAuth()
+@UseGuards(JwtAuthGuard)
+export class AppController {
+	@Get("ping")
+	pong() {
+		return {
+			message: "pong",
+		};
+	}
+}
diff --git a/src/app.module.ts b/src/app.module.ts
index 179f08c..de60341 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -7,6 +7,7 @@ import { envValidation } from "@Validations/env.validation";
 import { AuthModule } from "@Modules/auth/auth.module";
 import { UserModule } from "@Modules/user/user.module";
 import { PrismaModule } from "nestjs-prisma";
+import { AppController } from "./app.controller";
 
 @Module({
 	imports: [
@@ -31,5 +32,6 @@ import { PrismaModule } from "nestjs-prisma";
 		UserModule,
 		AuthModule,
 	],
+	controllers: [AppController],
 })
 export class AppModule {}
diff --git a/src/interfaces/jwtPayload.ts b/src/interfaces/jwtPayload.ts
new file mode 100644
index 0000000..8632292
--- /dev/null
+++ b/src/interfaces/jwtPayload.ts
@@ -0,0 +1,3 @@
+export interface JwtPayload {
+	id: string;
+}
diff --git a/src/modules/auth/strategy/jwt.strategy.ts b/src/modules/auth/strategy/jwt.strategy.ts
index fc7e2d9..7a2bef5 100644
--- a/src/modules/auth/strategy/jwt.strategy.ts
+++ b/src/modules/auth/strategy/jwt.strategy.ts
@@ -1,9 +1,10 @@
+import { JwtPayload } from "@/interfaces/jwtPayload";
+import { UserService } from "@Modules/user/user.service";
 import { Injectable, UnauthorizedException } from "@nestjs/common";
+import { ConfigService } from "@nestjs/config";
 import { PassportStrategy } from "@nestjs/passport";
 import { User } from "@prisma/client";
-import { Strategy, ExtractJwt } from "passport-jwt";
-import { UserService } from "@Modules/user/user.service";
-import { ConfigService } from "@nestjs/config";
+import { ExtractJwt, Strategy } from "passport-jwt";
 
 @Injectable()
 export class JWTStrategy extends PassportStrategy(Strategy, "jwt") {
@@ -18,7 +19,7 @@ export class JWTStrategy extends PassportStrategy(Strategy, "jwt") {
 		});
 	}
 
-	async validate(payload: any): Promise<User> {
+	async validate(payload: JwtPayload): Promise<User> {
 		const user = await this.userService.findById(payload.id);
 
 		if (!user) {
diff --git a/src/modules/auth/strategy/refresh.strategy.ts b/src/modules/auth/strategy/refresh.strategy.ts
index 6ed3fbd..e37f79b 100644
--- a/src/modules/auth/strategy/refresh.strategy.ts
+++ b/src/modules/auth/strategy/refresh.strategy.ts
@@ -1,9 +1,10 @@
+import { JwtPayload } from "@/interfaces/jwtPayload";
+import { UserService } from "@Modules/user/user.service";
 import { Injectable, UnauthorizedException } from "@nestjs/common";
+import { ConfigService } from "@nestjs/config";
 import { PassportStrategy } from "@nestjs/passport";
 import { User } from "@prisma/client";
-import { Strategy, ExtractJwt } from "passport-jwt";
-import { UserService } from "@Modules/user/user.service";
-import { ConfigService } from "@nestjs/config";
+import { ExtractJwt, Strategy } from "passport-jwt";
 
 @Injectable()
 export class RefreshJWTStrategy extends PassportStrategy(Strategy, "refresh") {
@@ -18,7 +19,7 @@ export class RefreshJWTStrategy extends PassportStrategy(Strategy, "refresh") {
 		});
 	}
 
-	async validate(payload: any): Promise<User> {
+	async validate(payload: JwtPayload): Promise<User> {
 		const user = await this.userService.findById(payload.id);
 
 		if (!user) {
diff --git a/src/modules/user/user.service.ts b/src/modules/user/user.service.ts
index 5e1ae89..d1d1399 100644
--- a/src/modules/user/user.service.ts
+++ b/src/modules/user/user.service.ts
@@ -25,7 +25,7 @@ export class UserService {
 		});
 	}
 
-	async findById(id: string) {
+	async findById(id: string = null) {
 		return await this.prisma.user.findUnique({
 			where: { id },
 		});