DB_Address

This course teaches you how to build robust and secure RESTful APIs using the NestJS framework.

Yan Sun - Building Real-World Restful APIs with NestJS and TypeScript-02.png

address-book-api.tar.gz

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nestjs-new

nestjs-2.1-module

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Testing Example

NestJS is built on top of the popular Express.js library and provides a modular and structured approach to building server-side applications.

You will take a hands-on approach to constructing a practical RESTful API from the ground up. By leveraging NestJS, TypeScript, and other technologies, you will delve into various topics, such as data modeling with TypeORM and MySQL, authentication and authorization mechanisms, request validation, error handling strategies, testing methodologies, deployment practices, and more.

By the end of this course, you will have gained the essential skills, knowledge, and hands-on experience necessary to build a real-world RESTful API. You will have learned how to scale your application using a public cloud, such as AWS, where your application can serve thousands and millions of customers cost-effectively. This comprehensive learning journey equips you to confidently navigate the intricacies of RESTful API development, ensuring you are well-prepared for NestJS development.

Building Secure RESTful APIs with NestJS: A Practical Guide

The controller is responsible for managing the application's external dependencies and middleware, while the service is responsible for handling database connections and executing SQL queries.

The controller is responsible for defining the application's main entry point and configuration, while the service manages the application's authentication and authorization mechanisms.

The controller is responsible for defining the routing and request-handling logic, while the service is responsible for implementing the business logic and data manipulation.

The controller is responsible for rendering views and handling client-side logic, while the service is responsible for managing server-side caching and optimizing performance.

What is the primary responsibility of a controller and a service?

What is the primary responsibility of a controller and a service?

```
@Controller('example')
export class ExampleController
  constructor(MyService) {
    this.myService = myService;
  }
}
```

```
@Controller('example')
export class ExampleController {
  constructor(private readonly myService: MyService) {}
}
```

```
@Controller('example')
export class ExampleController {
  constructor(@Injectable() private readonly myService: MyService) {}
}
```

```
@Controller('example')
export class ExampleController {
  constructor(@Inject(MyService) private readonly myService: MyService) {}
}
```

Which option has the correct syntax for injecting `MyService` into `ExampleController` in NestJS?
```
@Injectable()
export class  MyService {}
```

Which option has the correct syntax for injecting <code>MyService</code> into <code>ExampleController</code> in NestJS?
<pre><code>@Injectable()
export class MyService {}
</code></pre>

An empty response is returned with a status code of 200.

An error response with status code `400 Bad Request` is returned.

Given the following endpoints in `AddressController`, what is the response for the `/address/all` request?
```
@Controller('address')
export class AddressController {
    constructor(private readonly addressService: AddressService) {}
    @Get(':id')
    getById(@Param('id', ParseIntPipe) id: number) {
        // return the address for id
    }

    @Get('all')
    getAll() {
       // return all addresses data 
    }
```

Given the following endpoints in <code>AddressController</code>, what is the response for the <code>/address/all</code> request?
<pre><code>@Controller('address')
export class AddressController {
 constructor(private readonly addressService: AddressService) {}
 @Get(':id')
 getById(@Param('id', ParseIntPipe) id: number) {
 // return the address for id
 }

 @Get('all')
 getAll() {
 // return all addresses data 
 }
</code></pre>

To abstract the data storage implementation and interact with the database

To handle HTTP requests and responses in NestJS

To define how data will be sent over the network between different application layers

To represent business objects in the application


Which statement best describes the purpose of the DTOs?

Which statement best describes the purpose of the DTOs?

HMR allows automatic updates without a server restart, while the default full reload will restart the server.

Default reload and NestJS HMR serve the same purpose and can be used interchangeably for code reloading.

HMR comes with additional debugging capabilities. The default reload doesn't have the capability.

With HMR, we don't need to recompile the entire project whenever a change occurs. This saves time and makes development easier.

What is the main advantage of using HMR over the default full reload in NestJS development?

What is the main advantage of using HMR over the default full reload in NestJS development?

Entities are used together with decorators to define the structure and behavior of the business objects that interact with the database.

Entities enable the automatic validation and transformation of incoming data.

Entities abstract away the details of data storage implementation.

Entities provide an object-oriented approach to interact with the database.

Which statement is NOT true about entities in NestJS?

Which statement is NOT true about entities in NestJS?

Route parameters can only be extracted from the request body of the route handler.

Route parameters must be explicitly defined using the `@RouteParam()` decorator in the `controller` class.

Route parameters are optional and can be omitted from the route path if not required.

Route parameters are defined by prefixing the parameter name with a colon (:), and the route handler can access it using the `@Param` decorator.

Which statement is true regarding route parameters in NestJS?

Which statement is true regarding route parameters in NestJS?

```
import { ApiParam } from '@nestjs/swagger';

@ApiParam({ name: 'id', description: 'The ID of the item' })
@Get(':id')
findById(@Param('id') id: string) {
  // Return an item by its ID
}
```

```
import { ApiOperation } from '@nestjs/swagger';

@ApiOperation({ summary: 'Find an item by ID' })
@Get(':id')
findById(@Param('id') id: string) {
  // Return an item by its ID
}
```

```
import { ApiDescription } from '@nestjs/swagger';

@ApiDescription({ description: 'Find an item by ID' })
@Get(':id')
findById(@Param('id') id: string) {
  // Return an item by its ID
}

```

```
import { ApiSummary } from '@nestjs/swagger';

@ApiSummary({ summary: 'Find an item by ID' })
@Get(':id')
findById(@Param('id') id: string) {
  // Return an item by its ID
}
````

 We need to provide a description for the `findById` API endpoint in the Swagger UI. Select the correct decorator and its usage from the following options:

We need to provide a description for the <code>findById</code> API endpoint in the Swagger UI. Select the correct decorator and its usage from the following options:

Test your knowledge of NestJS basic concepts, including the CLI commands, modules, controllers, services, DTOs, and entities.

Introduction

NestJS Fundamentals

Connecting with REST: Building the Address Book App with NestJS

Understand the Basics of NestJS and RESTful APIs

Validation, Exception Handling, and Logging

Persist Data with TypeORM and MySQL

Serialization and Interceptors

Authentication and Authorization

Persist Data, Authentication, Validation, and Serialization

Testing

Deployment

Testing and Deployment

Conclusion

Appendix

Quiz: Building a NestJS API