Building a Back-End Application with NestJS/

...

/

Controllers in NestJS

Controllers in NestJS

Learn how to use a controller to handle routing in NestJS application.

We'll cover the following...

Controllers are responsible for processing incoming HTTP requests and returning the appropriate HTTP responses. In essence, controllers act as an intermediary between the client and the rest of the application, handling the request-response process and ensuring they send the appropriate response back to the client.

Using the @Controller decorator to define a controller

To create a new controller related to students in our school management system, we can define a new class and use the @Controller('students') decorator to specify the base URL for the endpoint associated with the controller.

Press + to interact
import { Controller } from '@nestjs/common';
@Controller('students')
export class StudentsController {
  // Controller methods go here
}

Using various HTTP request decorators

NestJS provides decorators for different HTTP request methods to define handlers for specific requests. Here are some examples:

The @Get request

In a NestJS controller, we can use the @Get() decorator to define a GET endpoint, which maps the decorated method to the GET HTTP method and allows us to retrieve data from the server.

Press + to interact
import { Controller, Get } from '@nestjs/common';
@Controller('students')
export class StudentsController {
  private students = [];
  
  @Get()
  findAll(): string {
     return this.students;
  }
}

In the above code, we define a GET endpoint for the ...