This document provides an overview of Node.js and Express.js. It defines Node.js as a JavaScript runtime environment for building scalable server-side web applications, and Express.js as a web application framework built on Node.js. Some key points covered include Node.js' event-driven, non-blocking architecture that enables high concurrency; examples of using Node.js and Express.js for real-time applications and APIs; and the typical development process along with various use cases in industries.

1. NODE.JS AND
EXPRESS.JS
UNLEASHED
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Powering Web Applications with
JavaScript
Anik
MERN
Trainer,

2. WHAT IS
NODE.JS?
• Node.js is a server-side JavaScript runtime
environment that allows developers to run
JavaScript code on the server, outside of a browser
environment.
• At its core, Node.js uses the V8 JavaScript engine,
originally developed for Google Chrome, to execute
JavaScript code efficiently and handle high
concurrency with its event-driven, non-blocking I/O
model.
• This event-driven architecture enables Node.js to
handle multiple concurrent connections, making it
highly scalable and ideal for building real-time
applications and data-intensive web applications.

3. EXAMPLE
Imagine you're building a real-time chat application
where users can send messages instantly. With Node.js,
you can handle multiple connections efficiently,
ensuring fast and responsive communication between
users.

4. WHAT IS
EXPRESS.JS?
• Express.js is a minimalist web application
framework built on top of Node.js, providing a
robust set of features and tools for building web
applications and APIs.
• Express.js offers a simple and flexible approach to
web development, allowing developers to define
routes, handle requests and responses, and
manage middleware to perform various tasks."
• With Express.js, developers can easily build APIs,
create dynamic web pages, handle
authentication and sessions, and integrate with
databases and other external services.

5. how it
works?
Suppose you're developing an e-commerce website. Using
Express.js, you can easily define routes to handle various tasks
such as displaying product listings, processing orders, and
managing user authentication.

6. WHY USE NODE.JS AND
EXPRESS.JS?
Vast Ecosystem: Node.js has a vast
ecosystem of modules and packages
available through npm, allowing
developers to easily incorporate
existing solutions and libraries into
their projects.
Code Reusability: JavaScript is a
universal language that can be used
both on the client and server-side,
enabling code reuse and sharing of
logic between the front-end and
back-end.
Scalability: Node.js can handle a
large number of concurrent requests
efficiently, making it suitable for
applications with high traffic and
real-time interactions.

7. WHY USE NODE.JS AND
EXPRESS.JS?
Community and Support: Node.js
and Express.js have active
communities, extensive
documentation, and a wealth of
online resources, making it easy to
find help and learn from others.
Fast Development: Express.js
provides a concise and intuitive
syntax, along with powerful
middleware, which accelerates the
development process and enables
rapid prototyping.

8. Express.js also supports the MVC (Model-View-
Controller) pattern, enabling a separation of concerns
and a structured approach to organising code.
ARCHITECTURE
OF A NODE.JS
AND
EXPRESS.JS
APPLICATION
I
II
III
A Node.js and Express.js application follows a client-server architecture,
where the client (usually a web browser) sends requests to the server
(built with Node.js and Express.js) and receives responses.
Express.js uses middleware to process incoming requests,
which can handle tasks such as logging, parsing request
bodies, handling sessions, and authentication.
The application's routes define the URLs and corresponding
logic, allowing the server to respond appropriately to
different requests.
III|

9. THE ARCHITECTURE
OF A BLOG
APPLICATION
Internet
Data Storage
Retrive
&
Update
Blog Server
Serve Content
(HTML/XML)
Maintain Entries
Blog Author
(web browser or
custom software) Read & write
comments
Blog Reader
(web browser)
Blog Reader
(web browser)

10. DEVELOPMENT PROCESS
WITH NODE.JS AND
EXPRESS.JS
• Setting up the development environment by installing Node.js and Express.js.
• Creating a new Express.js project using the Express application generator or setting up the project
manually.
• Defining routes and route handlers to handle different URLs and HTTP methods.
• Integrating with databases or other external services using appropriate libraries or modules.
• Implementing server-side logic, such as rendering views, handling form submissions, and performing
business operations.
• Testing the application, including unit tests, integration tests, and end-to-end tests.
• Deploying the application to a production environment, either on-premises or in the cloud.

11. REAL-WORLD USE
CASES OF NODE.JS
AND EXPRESS.JS

12. REAL-TIME
APPLICATIONS
APIS AND
MICROSERVICES
Node.js's event-driven nature
makes it well-suited for building
real-time applications like chat
applications, collaboration tools,
and live dashboards.
Apps like Slack or WhatsApp use
Node.js and Express.js to enable
instant messaging between users
in real-time.
Express.js provides a lightweight
framework for building RESTful APIs
and microservices, allowing
developers to create scalable and
modular backend systems.
Services like Stripe or PayPal use
Express.js to build APIs that handle
payment processing and integrate
with other applications.
Real-World
use cases

13. STREAMING
APPLICATIONS
PROXY SERVERS
AND REVERSE
PROXIES
Node.js's non-blocking I/O makes it
ideal for building streaming
applications, such as video or
audio streaming platforms.
Platforms like Netflix or Twitch
leverage Node.js's non-blocking I/O
to deliver streaming media content
efficiently.
Node.js's performance and flexibility
enable it to act as a proxy server or
reverse proxy, facilitating load
balancing, caching, and request
routing.
Applications like Nginx or HAProxy
use Node.js to create proxy servers
that handle load balancing and
route requests to different backend
servers.
Real-World
use cases

14. SINGLE-PAGE
APPLICATIONS
(SPAS)
Express.js, combined with front-end frameworks
like React or Angular, enables the creation of
powerful single-page applications with server-
side rendering capabilities.
Tools like Next.js or Nuxt.js combine Express.js with
frontend frameworks like React or Vue.js to build
powerful SPAs with server-side rendering
capabilities.

15. In conclusion, Node.js and Express.js empower developers to
build scalable, efficient, and real-time web applications
using JavaScript on the server-side.
Their event-driven, non-blocking I/O model, along with the
flexibility of Express.js, provides a powerful platform for web
development.
We encourage you to dive deeper into these technologies,
explore their vast ecosystems, and leverage their
capabilities to create innovative and high-performing web
applications.
Thank you for attending this webinar, and we hope you're
now equipped to unlock the full potential of Node.js and
Express.js in your web development journey!
CONCLUSIONS

16. CAREER
OPPORTUNITIES
Web Designer Front end
Web
Development
Back end
Web
Development
UI/UX
Designer

17. Validate skills,
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Stand out from the
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Certifications:
Showcasing Expertise
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It showcases
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a portfolio,
Demonstrate
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Relevant
Projects
Familiarize yourself
with web design,
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hooks, API
Integration and
important topics of
web development.
Additional
Preparation
Steps
BOOST YOUR BACKEND
CAREER PROSPECTS

18. Do you
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any
questions?
Drop it in the chat box!
We hope you learned
something new.

19. For attending this masterclass
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