**How ​​to Create a REST API with Nest.js and TypeScript**

Nest.js is a progressive Node.js framework for building efficient and scalable server-side applications. It uses TypeScript by default and is inspired by Angular, making it easy to create well-structured, modular applications. In this guide, you will learn how to create a basic REST API using Nest.js and TypeScript.

Prerequisites
Before you begin, make sure you have the following installed:
Node.js (version 12 or higher)
npm (Node.js package manager)
Nest CLI (you can install it with npm install -g @nestjs/cli)

Step 1: Create a New Nest.js Project
First, create a new project using the Nest.js CLI:

nest new my-api

Follow the instructions to set up the project. Once created, navigate to the project directory:

cd my-api

Step 2: Create a Module
Nest.js organizes the code into modules. Let's create a module to manage an entity called “users”:

nest generate module users

Step 3: Create a Controller
The controller handles HTTP requests. Let's create a controller for the users:

nest generate controller users

This will create a users.controller.ts file in the src/users directory.

Step 4: Create a Service
The service contains the business logic. Let's create a service for users:

nest generate service users

This will create a users.service.ts file in the src/users directory.

Step 5: Define the User Entity
Let's define a basic user entity. Create a user.entity.ts file in the src/users directory with the following content:
TypeScript

Step 6: Implement the Service
In the users.service.ts file, implement methods to handle users:
TypeScript

 
Step 7: Deploy the Controller
In the users.controller.ts file, define the routes and methods to handle HTTP requests:
TypeScript

Step 8: Run the Application
Finally, run the application:

npm run start

Your REST API will be available at http://localhost:3000/users.

Conclusion
Congratulations! You've created a basic REST API with Nest.js and TypeScript. From here, you can expand the functionality by adding authentication, data validation, and connecting to a database such as PostgreSQL or MongoDB.

I hope this guide is useful to you.

Thank you for reading and leave me your comments! ??

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