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Building Secure RESTful APIs with NestJS: A Practical Guide

Create the GET Endpoint

Learn and practice how to implement a GET endpoint.

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Get address by using the id endpoint

We created the address module in previous lessons with a controller and service. It’s time to implement our first API endpoint!

Add the service method

First, let’s create a new method in AddressService.

TypeScript 4.9.5
@Injectable()
export class AddressService {
  private addressDataStore: AddressDto[] = [];
  // Retrieves an address by its unique ID.
  getById(id: number) {
    // Finds an address in the 'addresses' store 
    // where the 'id' property matches the provided 'id'.
    return this.addressDataStore.find(t => t.id === id);
  }
}

Here, we use the addressDataStore private property to store the address data. This is a temporary work-around, and we’ll implement the data persistent to the MySQL database later in the course.

Notice that the getById method doesn’t have a modifier in the code snippet above. We didn’t add a public modifier for the method because all class members default as public in TypeScript, which means they’re accessible from outside the class. ...