diff --git a/backend/src/modules/auth-module/controller/auth.controller.ts b/backend/src/modules/auth-module/controller/auth.controller.ts
index 87607a2..a9bda8d 100644
--- a/backend/src/modules/auth-module/controller/auth.controller.ts
+++ b/backend/src/modules/auth-module/controller/auth.controller.ts
@@ -7,8 +7,7 @@ import {
   UseGuards,
 } from '@nestjs/common';
 import { AuthService } from '../services/auth.service';
-import { UserCredentialsDto } from '../models/dto';
-import { Tokens } from '../models/types';
+import { TokensDto, UserCredentialsDto } from '../models/dto';
 import { RefreshTokenGuard } from '../common/guards';
 import { GetCurrentUser, GetCurrentUserId, Public } from '../common/decorators';
 
@@ -21,7 +20,7 @@ export class AuthController {
   @HttpCode(HttpStatus.CREATED)
   public async signup(
     @Body() userCredentials: UserCredentialsDto
-  ): Promise<Tokens> {
+  ): Promise<TokensDto> {
     return this.authService.signup(userCredentials);
   }
 
@@ -30,7 +29,7 @@ export class AuthController {
   @HttpCode(HttpStatus.OK)
   public async signin(
     @Body() userCredentials: UserCredentialsDto
-  ): Promise<Tokens> {
+  ): Promise<TokensDto> {
     return this.authService.signin(userCredentials);
   }
 
@@ -47,7 +46,7 @@ export class AuthController {
   public async refresh(
     @GetCurrentUserId() userId: number,
     @GetCurrentUser('refresh_token') refresh_token: string
-  ): Promise<Tokens> {
+  ): Promise<TokensDto> {
     return this.authService.refresh(userId, refresh_token);
   }
 }
diff --git a/backend/src/modules/auth-module/models/dto/index.ts b/backend/src/modules/auth-module/models/dto/index.ts
index 7d5fd28..bd47ab5 100644
--- a/backend/src/modules/auth-module/models/dto/index.ts
+++ b/backend/src/modules/auth-module/models/dto/index.ts
@@ -1 +1,2 @@
 export * from './user-credentials.dto';
+export * from './tokens.dto';
diff --git a/backend/src/modules/auth-module/models/dto/tokens.dto.ts b/backend/src/modules/auth-module/models/dto/tokens.dto.ts
new file mode 100644
index 0000000..c4ad37b
--- /dev/null
+++ b/backend/src/modules/auth-module/models/dto/tokens.dto.ts
@@ -0,0 +1,11 @@
+import { IsNotEmpty, IsString } from 'class-validator';
+
+export class TokensDto {
+  @IsNotEmpty()
+  @IsString()
+  public access_token: string;
+
+  @IsNotEmpty()
+  @IsString()
+  public refresh_token: string;
+}
diff --git a/backend/src/modules/auth-module/models/types/index.ts b/backend/src/modules/auth-module/models/types/index.ts
index 90e9169..0e70b68 100644
--- a/backend/src/modules/auth-module/models/types/index.ts
+++ b/backend/src/modules/auth-module/models/types/index.ts
@@ -1,3 +1,2 @@
-export * from './tokens.type';
 export * from './jwt-payload.type';
 export * from './jwt-payload-with-refresh-token.type';
diff --git a/backend/src/modules/auth-module/models/types/tokens.type.ts b/backend/src/modules/auth-module/models/types/tokens.type.ts
deleted file mode 100644
index 1c0a510..0000000
--- a/backend/src/modules/auth-module/models/types/tokens.type.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-export type Tokens = {
-  access_token: string;
-  refresh_token: string;
-};
diff --git a/backend/src/modules/auth-module/services/auth.service.ts b/backend/src/modules/auth-module/services/auth.service.ts
index 272e841..5b2f56f 100644
--- a/backend/src/modules/auth-module/services/auth.service.ts
+++ b/backend/src/modules/auth-module/services/auth.service.ts
@@ -1,6 +1,5 @@
 import { ForbiddenException, Injectable } from '@nestjs/common';
-import { UserCredentialsDto } from '../models/dto';
-import { Tokens } from '../models/types';
+import { TokensDto, UserCredentialsDto } from '../models/dto';
 import { EncryptionService } from './encryption.service';
 import { UserRepository } from '../repositories/user.repository';
 import { TokenManagementService } from './token-management.service';
@@ -13,7 +12,7 @@ export class AuthService {
     private readonly encryptionService: EncryptionService
   ) {}
 
-  public async signup(userCredentials: UserCredentialsDto): Promise<Tokens> {
+  public async signup(userCredentials: UserCredentialsDto): Promise<TokensDto> {
     const passwordHashed = await this.encryptionService.hashData(
       userCredentials.password
     );
@@ -24,7 +23,7 @@ export class AuthService {
     return this.generateAndPersistTokens(user.id, user.email);
   }
 
-  public async signin(userCredentials: UserCredentialsDto): Promise<Tokens> {
+  public async signin(userCredentials: UserCredentialsDto): Promise<TokensDto> {
     const user = await this.userRepository.findUserByEmail(
       userCredentials.email
     );
@@ -43,7 +42,10 @@ export class AuthService {
     return this.generateAndPersistTokens(user.id, user.email);
   }
 
-  public async refresh(userId: number, refreshToken: string): Promise<Tokens> {
+  public async refresh(
+    userId: number,
+    refreshToken: string
+  ): Promise<TokensDto> {
     const user = await this.userRepository.findUserById(userId);
     if (!user || !user.hashedRt) {
       throw new ForbiddenException('Access Denied');
@@ -71,7 +73,7 @@ export class AuthService {
   private async generateAndPersistTokens(
     userId: number,
     email: string
-  ): Promise<Tokens> {
+  ): Promise<TokensDto> {
     const tokens = await this.tokenManagementService.generateTokens(
       userId,
       email
diff --git a/backend/src/modules/auth-module/services/token-management.service.ts b/backend/src/modules/auth-module/services/token-management.service.ts
index 73ad211..2ebc7d8 100644
--- a/backend/src/modules/auth-module/services/token-management.service.ts
+++ b/backend/src/modules/auth-module/services/token-management.service.ts
@@ -1,7 +1,7 @@
 import { Injectable } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
-import { Tokens } from '../models/types';
 import { JwtService } from '@nestjs/jwt';
+import { TokensDto } from '../models/dto';
 
 @Injectable()
 export class TokenManagementService {
@@ -24,7 +24,10 @@ export class TokenManagementService {
     this.JWT_SECRET_RT = this.configService.get<string>('JWT_SECRET_RT');
   }
 
-  public async generateTokens(userId: number, email: string): Promise<Tokens> {
+  public async generateTokens(
+    userId: number,
+    email: string
+  ): Promise<TokensDto> {
     const access_token: string = await this.createAccessToken(userId, email);
     const refresh_token: string = await this.createRefreshToken(userId, email);
     return { access_token, refresh_token };