A secure and modular API built using NestJS with user authentication, role-based access control, and CRUD functionality for products.

Features Authentication: User registration and login using JWT. Role-Based Access Control: Admin and User roles with restricted access. Product Management: Create, read, update, and delete products. Validation: Robust data validation using class-validator. Environment Configuration: Easy setup using .env files. Setup Instructions

1. Prerequisites

Node.js: Ensure Node.js is installed npm: Comes with Node.js. Ensure npm is installed. MongoDB: Install and run a MongoDB instance locally or use a cloud-hosted MongoDB URI.

2. Clone the Repository

git clone <repository-url>
cd <repository-folder>

3. Install Dependencies

npm install

4. Set Up Environment Variables

Create a .env file in the root of the project with the following variables:

Application:

PORT=3000

JWT Configuration:

JWT_EXPIRES_IN=3600s

MongoDB:

MONGODB_URI=mongodb://localhost:27017/nest-api Replace your_jwt_secret with a secure string. Adjust MONGODB_URI if you're using a cloud-hosted MongoDB instance.

5. Run the Application

npm run start The API will be accessible at http://localhost:3000.

API Endpoints

1. Authentication

Method	Endpoint	Description
POST	/auth/register	Register a new user
POST	/auth/login	Login and get a JWT token

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2. Products

Method	Endpoint	Description
POST	/products	Create a new product
GET	/products	Get all products
GET	/products/:id	Get product by ID
PATCH	/products/:id	Update product by ID
DELETE	/products/:id	Delete product by ID

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Role-Based Access Control

• Admin: Can create, update, delete products and manage user roles.
• User: Can create, update, and view products they own.

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Testing with Postman

1. Please import the file called NestJS_API_Collection.json to postman to view the collection
2. Use the Register and Login endpoints to get JWT tokens.
3. Add the JWT token to the Authorization header for protected routes.