DTO class creation in NestJS - Mini Project: Build & Apply

DTO Class Creation in NestJS

📖 Scenario: You are building a simple NestJS application to manage books in a library. You need to create a Data Transfer Object (DTO) class to define the shape of data when adding a new book.

🎯 Goal: Create a DTO class called CreateBookDto with exact properties and types to ensure data consistency when adding books.

📋 What You'll Learn

Create a class named CreateBookDto

Add a string property title

Add a string property author

Add a number property yearPublished

Add a boolean property isAvailable

💡 Why This Matters

🌍 Real World

DTO classes help keep data consistent and clear when sending or receiving data in web applications, especially in frameworks like NestJS.

💼 Career

Understanding DTOs is essential for backend developers working with NestJS or similar frameworks to build clean, maintainable APIs.

1

Create the DTO class skeleton

Create a class named CreateBookDto using the export keyword.

NestJS

export class CreateBookDto {
  // Your code here
}

Need a hint?

Use export class CreateBookDto {} to start your DTO class.

2

Add string properties for title and author

Inside the CreateBookDto class, add two properties: title and author, both of type string.

NestJS

export class CreateBookDto {
  // Add string properties title and author here
}

Need a hint?

Define properties like title: string; inside the class.

3

Add number and boolean properties

Add two more properties inside CreateBookDto: yearPublished of type number and isAvailable of type boolean.

NestJS

export class CreateBookDto {
  title: string;
  author: string;
  // Add yearPublished and isAvailable properties here
}

Need a hint?

Use yearPublished: number; and isAvailable: boolean; inside the class.

4

Export the complete DTO class

Ensure the CreateBookDto class is exported and contains all four properties: title, author, yearPublished, and isAvailable.

NestJS

export class CreateBookDto {
  title: string;
  author: string;
  yearPublished: number;
  isAvailable: boolean;
  // Finalize export here
}

Need a hint?

Check that the class is exported and all properties are present with correct types.