Building Secure RESTful APIs with NestJS: A Practical Guide/

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Creating an Authentication Module with User Sign-Up

Creating an Authentication Module with User Sign-Up

Learn to create an authentication module with a user sign-up endpoint.

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Authentication module

The authentication module in NestJS encapsulates the logic for user authentication, often including essential features such as the user sign-up endpoint. The user sign-up endpoint allows users to register and create a user account, providing the foundation for secure and personalized interactions within the application.

In this lesson, we’ll create AuthModule with a user sign-up endpoint. This module will include a user entity and service, allowing users to register with our application. We’ll explore the essential steps and concepts to set up this authentication functionality.

The AuthModule module

First, let’s create AuthModule. This module will handle the user sign-up logic.

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@Module({
  imports:[UserModule]
})
export class AuthModule {}

In line 2, UserModule is imported to make its components and services available within AuthModule. We will use UserService from UserModule for the sign-up process.

Create the service and controller

Next, we define an AuthService class as follows:

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@Injectable()
export class AuthService {
  constructor(private readonly userService: UserService) {}
  async signup(userDto: CreateUsersDto) {
    const existingUser = await this.userService.getByEmail(userDto.email);
    if (existingUser) {
      throw new HttpException('User already exists', HttpStatus.FOUND);
    }
    return await this.userService.createUser(userDto);
  }
}
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