NestJS in 100 Seconds

Summary

NestJS is a Node.js framework that helps build scalable, maintainable server-side applications using TypeScript. It provides tools to quickly develop REST and GraphQL APIs by leveraging Express or Fastify. The framework uses predictable code patterns like controllers and providers to handle requests and dependencies. Modules and lazy loading facilitate code organization and optimize performance. Key features include easy database integration, built-in security, and robust testing support with Jest. By accelerating development and encouraging good practices, NestJS speeds up building reliable full-stack and microservice apps.

Takeaways

• 😀 NestJS is a Node.js framework for building scalable server-side apps using TypeScript
• 👨‍💻 It provides tools that leverage Express/Fastify for rapid, predictable development
• 📦 Supports REST & GraphQL APIs out of the box, or can be used for full-stack MVC apps
• 🔌 Contains built-in modules for databases, security, streaming, etc
• 🛠️ Has a powerful CLI to scaffold new projects with Jest, TypeScript, etc
• 🧱 Fundamental building blocks are controllers which handle HTTP requests/responses
• 🔒 Providers contain shared logic injected app-wide as dependencies, like auth guards
• ⚡ Pipes efficiently validate/transform controller values
• 📚 Modules organize code into lazy-loaded chunks for better performance
• ✅ Great for building scalable, maintainable server-side applications!

Q & A

What is NestJS?

NestJS is a Node.js framework for building scalable, server-side applications using TypeScript.

What does NestJS provide out of the box?

NestJS provides support for REST and GraphQL APIs, as well as tools to facilitate rapid development and predictable, readable code.

How can NestJS be used?

NestJS can be used to build full-stack applications using the MVC pattern, similar to frameworks like Laravel or Ruby on Rails. It can also be used for server-side applications like APIs.

What is the purpose of controllers in NestJS?

Controllers are responsible for handling incoming HTTP requests and returning responses back to the client.

How are providers used in NestJS?

Providers contain shared logic that can be injected as dependencies wherever needed, like for authentication, validation, etc.

What benefits do modules provide?

Modules allow code to be organized into smaller chunks that can be lazy loaded for better performance in serverless environments.

What tools does NestJS offer?

NestJS has a powerful CLI tool to scaffold new projects. It also provides built-in support for testing, DB access, security, streaming, and more.

How does NestJS support code quality?

NestJS uses TypeScript to enable type safety. It also has decorators to control things like status codes and enforce separation of concerns.

Why is NestJS a good choice?

NestJS enables rapid development with its CLI and built-in capabilities. It also facilitates scalability and maintainable code.

What is a benefit of NestJS for developers?

NestJS provides structure and patterns that make applications more predictable and readable for developers.

Outlines

00:00

😄 Introducing NestJS, a Node.js Framework for Building Scalable Apps

Paragraph 1 provides an introduction to NestJS. It explains that NestJS is a Node.js framework for building scalable, server-side applications using TypeScript. It leverages Fastify or Express and facilitates rapid development with predictable, readable code. NestJS supports REST and GraphQL APIs out of the box and can be used to build full stack apps using the MVC pattern. It contains built-in modules for working with databases, security, streaming, etc.

👨‍💻 NestJS CLI and Project Scaffolding

Paragraph 2 discusses the NestJS CLI tool that can scaffold out new projects pre-configured with Jest for testing and TypeScript for readable code. It points out the controllers directory which handles incoming requests and returning responses. Controllers contain methods decorated with HTTP verbs to create endpoints.

😃 Key NestJS Components: Controllers, Providers, Modules

Paragraph 3 summarizes other key NestJS components. Providers contain shared logic injected as dependencies. Pipes validate/transform values in controllers. Modules organize code into chunks for lazy loading.

👋 Conclusion - NestJS in 100 Seconds

The final paragraph concludes the overview of NestJS, stating it was NestJS in 100 seconds. It invites viewers to like and subscribe for more short videos.

Keywords

💡framework

A framework refers to a platform for developing software applications. NestJS is a framework built specifically for Node.js to help structure and organize server-side web applications using TypeScript. The video highlights how NestJS provides tools and modules like controllers, providers, pipes etc. to accelerate development.

💡scalable

Scalable means that an application can handle increasing loads and traffic without much degradation in performance. The video mentions how NestJS applications are scalable because code can be modularized into lazy-loaded modules that run efficiently.

💡controllers

Controllers are core components in NestJS responsible for handling HTTP requests and returning responses. They act as endpoints for different routes and can implement CRUD functionalities. The video shows how controllers facilitate rapid API development in NestJS.

💡providers

Providers are classes that encapsulate reusable business logic and dependencies in NestJS. They can be injected wherever required, like in guards for authentication or pipes for validation. Providers enhance separation of concerns in large applications.

💡pipes

Pipes in NestJS enable efficient data transformation and validation right before reaching route handlers or controllers. The video cites pipes as an example of a provider that can be implemented for input sanitization and output shaping.

💡modules

Modules help organize code into modular, reusable units that can be lazily loaded as required in NestJS applications. This facilitates selective loading of code for improved start-up time and efficiency in serverless deployments.

💡decorators

Decorators in NestJS are functions that modify and annotate classes and methods to augment their capabilities. The video mentions decorators like @Controller, @Get, @Param, @Injectable that enrich controller methods with routing, dependency injection etc.

💡CLI

CLI stands for Command Line Interface. NestJS provides a robust CLI tool to generate boilerplate code and project scaffolding rapidly. The video cites the CLI capabilities to boost developer productivity.

💡TypeScript

TypeScript extends JavaScript by adding static types and class-based objected-oriented programming. NestJS applications are written in TypeScript which enables superior auto-completion, error checking and large-scale code organization.

💡MVC

MVC stands for Model View Controller and it is an architectural pattern for building user interfaces by compartmentalizing data, presentation and control logic. The video mentions how NestJS can also be used to develop server-side rendered full-stack apps using the MVC approach like some other frameworks.

Highlights

NestJS is a Node.js framework for building scalable server-side applications with TypeScript

It provides a suite of tools that leverage Fastify or Express for rapid development and predictable, readable code

It supports REST and GraphQL APIs out of the box

You can use it to build full-stack apps using the MVC pattern, similar to Laravel or Ruby on Rails

It contains built-in modules for databases, security, streaming, and more

The CLI can scaffold a new project pre-configured with Jest testing and TypeScript

Controllers handle HTTP requests and return responses to clients

Providers contain shared logic injected as dependencies wherever needed

Modules allow code organization into lazy-loaded chunks for faster serverless execution

Decorators control status codes, headers, route parameters, request access, and more

The CLI can auto-generate controllers to keep code organized as complexity grows

Providers can be guards for authentication or pipes for validation

NestJS aims to facilitate rapid development and predictable, readable code

It leverages TypeScript for reliability

The modular architecture allows efficient code organization

Transcripts

nest js is a node.js framework for

building scalable server-side

applications with typescript it provides

a suite of tools that leverage either

fastify or express to facilitate

rapid development and predictable

readable code it supports rest and

graphql apis out of the box or you might

use it to build a full stack application

using the model view controller pattern

similar to frameworks like laravel

or ruby on rails and it contains a ton

of built-in modules to work with

databases

handle security implement streaming and

anything else you can imagine doing in a

server side application

nest has its own very powerful command

line tool and you can scaffold out a new

project with the nest

new command that provides a code base

pre-configured with jest for testing and

set up with typescript to help us write

more readable and reliable code in the

source directory you'll notice a

controller which is a fundamental

building block of the framework

it's responsible for handling incoming

http requests

and returning responses back to the

client to implement a controller simply

add the controller decorator

to a class then inside the class you can

implement methods

and decorate them with http verbs like

git

post patch put etc by default this will

create an http endpoint on the root url

but you can pass a string to the

decorator to

change the route or implement dynamic

route parameters in addition

nest provides other decorators to

control things like the status code and

headers then

in the method itself parameter

decorators can be used to access the

request parameters or body

and finally the return value from the

method is the response body

that gets sent back down to the client

what's awesome about nest

is that you can use the cli to

automatically generate more controllers

to keep your code organized as it grows

in complexity

but there's more to nest than just

controllers a provider is a class that

contains shared logic throughout the

entire application

and can be injected as a dependency

where needed any class with the

injectable decorator can be injected in

the constructor of another class

for example a provider can be

implemented as a guard to handle

role-based user authentication

or it might be implemented as a pipe to

efficiently validate and transform

values in a controller

and lastly we have the module decorator

which allows code to be organized into

smaller chunks

where it can be lazy loaded to run

faster in serverless environments

this has been nest js in 100 seconds if

you want to see more short videos like

this

make sure to hit the like button and

subscribe thanks for watching and i will

see you in the next one