Nestjs backend rest api - Ecommerce project. Introduction & setup.

Summary

This video tutorial guides viewers through creating a backend REST API for an e-commerce project using Nest.js, a framework for Node.js applications. It highlights the choice of TypeScript for type safety and TypeORM for database interactions with PostgreSQL. The presenter demonstrates installing necessary software, setting up the project structure with npm, and configuring the initial server to run on port 3000. The script also briefly touches on dependency injection and service creation, providing a foundational step for building out the API.

Takeaways

• 🛠️ The speaker is creating a back-end REST API using the Miss.js framework for Node.js server-side applications.
• 📚 TypeScript is chosen alongside Miss.js for its strong typing features, enhancing code quality and maintainability.
• 🔍 The ORM (Object-Relational Mapping) tool of choice is TypeORM, facilitating database interactions in a more abstract way.
• 🗃️ PostgreSQL is selected as the database for its robustness and scalability, suitable for an e-commerce platform.
• 🛒 The project is an e-commerce REST API, chosen for its comprehensive coverage of major features without being overly complex.
• 💻 Software prerequisites include Node.js, PostgreSQL, and a code editor like VS Code.
• 🔧 Postman or similar tools are recommended for checking API routes and functionality.
• 📝 The script provides step-by-step instructions for setting up the project, starting with installing Miss.js CLI.
• 📁 The project structure includes essential files like main.ts, app.module.ts, and app.controller.ts for organizing the application logic.
• 🔄 Dependency Injection is mentioned as a concept that will be explored later in the context of Miss.js services.
• 🔗 The script outlines how services and controllers interact within the Miss.js framework, with services providing business logic and controllers handling requests.
• 🚀 The final takeaway is about configuring the database connection, which is crucial for the API to interact with the PostgreSQL database.

Q & A

What is the purpose of creating a back-end REST API using Miss.js?

The purpose is to create an e-commerce REST API, which is chosen for its comprehensive coverage of major features suitable for a medium-sized project.

Why is Dash JS chosen for the Node.js server-side application?

Dash JS is chosen because it is a framework that is typically used for creating server-side applications in Node.js.

What is the role of TypeScript in this project?

TypeScript is used alongside Miss.js to provide type safety and other benefits of static typing in the development of the e-commerce REST API.

What ORM is being used in conjunction with TypeScript?

TypeORM is being used as an Object-Relational Mapping (ORM) tool alongside TypeScript to interact with the database.

Which database is chosen for the e-commerce REST API project?

PostgreSQL is chosen as the database for the project due to its robustness and scalability.

What software is required to be installed before starting the project?

Node.js, PostgreSQL, and an IDE like Visual Studio Code are required to be installed before starting the project.

What is the role of Postman in the development process?

Postman is used for checking and testing the routes of the REST API during the development process.

How does one initiate the creation of a new application using Miss.js CLI?

One initiates the creation of a new application by running the command 'npm init @miss-js/cli' followed by 'next <project-name>', such as 'next Bazaar API'.

What is the significance of the 'main.ts' file in the project structure?

The 'main.ts' file is the entry point of the application, where the server is set up to run on a specific port and the app module is initialized.

What is the function of 'app.module.ts' in the application?

'app.module.ts' is responsible for importing other modules, controllers, and providers that are part of the application's architecture.

Why is 'app.controller.speak.ts' being deleted from the project?

'app.controller.speak.ts' is intended for unit testing, which is not part of the current project scope, hence it is being deleted.

What is the role of dependency injection in the application?

Dependency injection is used to manage the dependencies of the application, such as services, in a way that promotes modularity and ease of testing.

How is the 'app.service.ts' utilized in the application?

'app.service.ts' defines the services used in the application, which can be injected into controllers to provide business logic or data access.

What does the 'app.controller.ts' file contain?

'app.controller.ts' contains the controllers that handle incoming requests and interact with services to return responses.

How does the application configure the database connection?

The script does not provide explicit details on configuring the database connection, but it is implied that this will be covered in subsequent steps of the project.

Outlines

00:00

🛠️ Setting Up a Back-End E-Commerce REST API with Miss.js

The speaker introduces the project of creating a back-end REST API for an e-commerce platform using Miss.js, a framework for Node.js server-side applications. They chose this project for its comprehensive coverage of major features without being overly complex. The video script details the installation of necessary software, including Node.js and PostgreSQL, and the use of VS Code for coding. It also covers the use of Postman for route checking. The process begins with installing 'next-js-cli' using npm and creating a new project named 'Bazaar API'. The script explains the file and folder structure generated by the 'next' command, including the main entry point in 'main.ts' and the server's configuration to run on port 3000.

05:01

📂 Exploring the Project Structure and Initial Setup

This paragraph delves into the project's source (SRC) folder, which contains several files crucial for the application's operation. The speaker explains the purpose of each file, such as 'main.ts' being the entry point, 'app.module.ts' for importing modules, controllers, and providers, and 'app.controller.ts' for creating controllers. The script mentions the deletion of the 'app.controller.speak.ts' file as it's for unit testing, which is not part of the current project scope. It also touches on the concept of dependency injection through 'app.service.ts', which is the only service file and is injectable, returning a 'hello world' string when called in the controller. The paragraph concludes with a mention of configuring the database connection in subsequent parts of the video.

Keywords

💡REST API

REST API stands for Representational State Transfer Application Programming Interface. It is an architectural style for designing networked applications. In the context of the video, the creator is building a back-end REST API for an e-commerce application using the Nest.js framework, which allows for the development of scalable server-side logic.

💡Nest.js

Nest.js is a JavaScript framework for building efficient, reliable, and scalable server-side applications. It uses TypeScript and is particularly well-suited for creating REST APIs. In the script, the speaker has chosen Nest.js for its robust features and its ability to handle complex e-commerce functionalities.

💡TypeScript

TypeScript is a statically typed superset of JavaScript that adds optional types to the language. It is used to improve the maintainability and scalability of JavaScript applications. The speaker mentions using TypeScript alongside Nest.js, highlighting its importance in the development process for type safety and developer productivity.

💡ORM

ORM stands for Object-Relational Mapping. It is a programming technique for converting data between the object model representation and the relational database representation. The speaker mentions using TypeORM, a specific ORM, to interact with the PostgreSQL database in their e-commerce API.

💡PostgreSQL

PostgreSQL is a powerful, open-source object-relational database system with an emphasis on extensibility and standards compliance. It is chosen by the speaker for its robustness and rich feature set, suitable for handling the data storage needs of an e-commerce application.

💡E-commerce

E-commerce refers to the buying and selling of goods or services using the internet, as well as the transfer of money and data to execute these transactions. The speaker chose an e-commerce project because it encompasses a wide range of features, providing a comprehensive scope for demonstrating the capabilities of the API being developed.

💡VS Code

VS Code, or Visual Studio Code, is a popular source code editor developed by Microsoft. It is known for its rich ecosystem of extensions and support for a variety of programming languages. The speaker mentions using VS Code for coding, which is a common choice among developers due to its powerful editing capabilities.

💡Postman

Postman is a collaboration platform for API development that helps developers design, build, test, and document APIs. In the script, Postman is mentioned as the tool the speaker will use to check the routes of the API, demonstrating its importance in the API development lifecycle.

💡npm

npm stands for Node Package Manager and is a package manager for JavaScript, used for installing and managing packages for Node.js applications. The speaker uses npm to install Nest.js CLI, which is essential for creating and managing the e-commerce API project.

💡Dependency Injection

Dependency Injection is a design pattern used to implement Inversion of Control (IoC) for the resolution of dependencies. It allows for more modular and testable code by reducing the coupling between classes. The speaker briefly mentions this concept in the context of the AppService being 'injectable' in the Nest.js application.

💡Controllers and Services

In the context of an MVC (Model-View-Controller) architecture, which Nest.js follows, controllers handle the incoming requests and use services to perform business logic. The speaker refers to 'app.controller.ts' for handling requests and 'app.service.ts' for the service layer, illustrating the separation of concerns in the application structure.

Highlights

Creating a back-end REST API using Nest.js, a framework for Node.js server-side applications.

Utilizing TypeScript along with TypeORM as an ORM for database interactions.

Choosing PostgreSQL as the database for the e-commerce REST API.

E-commerce project selected for covering major features without being too large or small.

Installing necessary software like Node.js and PostgreSQL before starting the project.

Using Visual Studio Code as the preferred code editor.

Checking routes with Postman or alternative tools like Insomnia.

Installing NestJS CLI using npm for project scaffolding.

Creating a new project folder and initializing it with NestJS CLI.

Choosing npm as the package manager for the project.

Exploring the file structure generated by NestJS, including node_modules, src, and package.json.

Deleting unnecessary test files to focus on the main application logic.

Understanding the role of main.ts as the entry point of the application.

Importing AppModule and setting up the server to run on port 3000.

AppModule's responsibility to import files, controllers, and providers.

Introduction to dependency injection and its usage in the application.

Creating and organizing controllers and services within the application.

Using AppService for business logic and injecting it into the controller.

Configuring the database connection for the e-commerce REST API.

Transcripts

delete your welcome

I am going to create a back-end rest API

with miss.js

Dash JS is used for node.js server side

application

it's a framework I choose to create an

e-commerce rest API

's framework typically use

typescript I also

use typescript along with

type or M as an orm and as for database

I use postgres SQL

you can ask why I choose eCommerce

project

I chose it because it's not a small

project

but not the biggest project either

actually it's covered most of the major

features that I know

before going to create these

rest API we need to

install some softwares

first is node.js

then

database postgres SQL

I am

using vs code

for coding you can use vs code or

whatever you want

and

checking the route

I will use

Postman you can use Postman or insomnia

or whatever you compute till compute

okay

if you

install these

softwares then here

these

messages documentation

it says several

points to

install niches

there is another one

there is another one but I

I will use this

npm I

Dash G at Ms JS slash CLI then next new

then project name

so

I'm copying these

line first npm I Dash G at mesh JS CLI

I have opened my visual studio code

then I open my terminal

so

I create a next API namely

a folder and it's in desktop

you can choose

file path or folder path and your viewer

computer

now I am

paste this line and click on enter

it will

take some time

okay I have installed next jscli now

it's time to create new application

openness.js

to

install new application we have to

copy these

command

then go again

paste it next new project name and I am

going to

name it

Bazaar API

okay next new Bazar API without

installing this next jsli remember it

will not

what so first install this JS CLI then

this command will work

next it tells which package manager

audio

like to use I am using npm if you

want you can choose yarn or pnpm I'm

using npm enter

okay

it's installed

now if we expand

API folder we can see the

node.js messages

file and folder structure plus node

modules then SRC test then sum of the

file

we

should have used

package.json

there is

starting

script

third div

and Etc

let's open SRC folder

SRC folder has some several files

main.ts appservice.ts

app

Dot module.ts

app.controller.ts

app.controller.speak.ts

this speak dot TS this is for unit

testing we are not going to paste

anything or dot unit testing

so I am going to

delete this file first because we don't

I don't need this

okay

main.ts this is our entry

point

and this import next Factory import app

module

this is the boot step

this function will be called first

and here is our

server is running on Port 300. and it's

have it list Factory dot create app

module and where is our app module app

module is app.module.ts

so this file

call in Main

dot TS and app module it's can import

file

and controller and providers

there is only one controller

app controller and here is our app

controller this is this

you can create as many as you want

and then you have to

put this

their controllers after one controller

then comma another controller and

providers providers is Services Services

there is only one service in this app so

for now this is

app.service.ts this is app service and

it's injectable what is

dependency injection we will see it

later but first It

app service and it return date hello

which string hello world and it's called

in controller

if you open controller app controller

here is the gate hello string and this

is called these dot f service dot gate

hello these dot app service and if this

is our

service and it's called this function so

it will return hello world and it will

return hello

and this is string

so

this is for now next oh you will

see how to

configure our database connection

okay bye