NestJS is a powerful and feature-rich framework for building web applications and APIs using TypeScript. It is built on top of the popular Express.js framework and is heavily influenced by Angular, making it a great choice for developers who are already familiar with Angular.
Before getting started with NestJS, it's important to have a basic understanding of TypeScript, Node.js, and Express.js. Once you have that, you can start building your first NestJS application.
- Installing NestJS: You can install NestJS by running the following command in your terminal:
npm install -g @nestjs/cli
- Creating a new project: Once you have the NestJS CLI installed, you can create a new project by running the following command:
nest new project-name
Setting up the project structure: NestJS uses a modular structure, which makes it easy to organize and maintain your code. The main components of a NestJS project include controllers, services, and modules.
Creating a controller: Controllers handle incoming requests and send responses. In NestJS, controllers are decorated with the @Controller() decorator. To create a controller, you can use the following command:
nest generate controller name-of-controller
- Creating a service: Services handle the business logic of your application. They are responsible for performing tasks such as data validation, database operations, and API calls. To create a service, you can use the following command:
nest generate service name-of-service
- Creating a module: Modules are used to group related controllers and services together. To create a module, you can use the following command:
nest generate module name-of-module
- Starting the server: Once you have set up your project structure, you can start the server by running the following command:
nest start
- Testing your application: NestJS provides a powerful testing framework that makes it easy to test your controllers, services, and other components. You can use the following command to run your tests:
nest test
In conclusion, NestJS is a powerful and feature-rich framework for building web applications and APIs using TypeScript. With its modular structure, it makes it easy to organize and maintain your code. And with its built-in support for testing, it makes it easy to ensure your code is working as expected.
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