NestJS in 100 Seconds
Summary
TLDRNestJS 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
😄 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.
Mindmap
Keywords
💡framework
💡scalable
💡controllers
💡providers
💡pipes
💡modules
💡decorators
💡CLI
💡TypeScript
💡MVC
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
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