Building a Secure Authentication System with NestJS, JWT, and PostgreSQL

In this tutorial, I will walk you through the process of building a secure authentication system using NestJS, JSON Web Tokens (JWT), and PostgreSQL. By the end of this guide, you will have a solid understanding of how to create a complete authentication system, including user registration, user login, and secure route protection.

Step 1: Setting Up the NestJS Project

• Install the Nest CLI globally
• Create a new NestJS project named “NestGuardian” or as you like.
• Install required dependencies for authentication, JWT, TypeORM, and PostgreSQL.

npm install -g @nestjs/cli

nest new nest-guardian

cd nest-guardian

npm install @nestjs/passport @nestjs/jwt passport passport-jwt bcrypt @nestjs/typeorm typeorm pg @nestjs/config

Step 2: Generating Modules, Services, and Controllers

• Generate the AuthModule, AuthService, and AuthController
• Generate the UsersModule, UsersService, and UsersController

nest generate module auth

nest generate service auth

nest generate controller auth

nest generate module users

nest generate service users

nest generate controller users