This document provides an overview of backend development and key concepts. It discusses fullstack development, the differences between front-end and back-end, Node.js, HTTP requests, static vs dynamic websites, APIs, and HTTP status codes. The document is intended to introduce readers to backend development topics and help them understand what is included in backend work versus front-end work.

1. Switch to Backend
Getting started with backend development
By Siddharta Shankar Paul
Core Member, GDSC

2. Switch to backend Day 1
Topic structure
What is Fullstack
Development?
Frontend vs
Backend
Node.js &
NPM
How web works
What is backend?
HTTP requests
Static vs Dynamic
Websites

3. Full stack development is the end-to-end development of applications. It includes
both the front end and back end of an application. The front end is usually accessed by
a client, and the back end forms the core of the application where all the business logic
is applied.
What is Fullstack Development ?
Full Stack = FrontEnd + BackEnd

5. "Backend" refers to any part of a website or software program that users do not
see.
Blah blah blah...
What is Backend ?

7. "Backend" refers to any part of a website or software program that users do not
see.
Blah blah blah...
What is Backend ?

8. How web works
Payload (Request) DB Query
Response Data
Business Logic Resides
here
HTM
L
CSS Javascript

10. What is the need to Switch to Backend
???

11. ●HTTP (Hyper Text Transfer Protocol)
●HTTPS (HTTP, but its Secure)
●TCP (Transmission Control Protocol)
●IP (Internet Protocol)
●API (Application Programming Interface)
Afraid of Buzzwords?

12. What is NodeJs???

13. Node. js is a single-threaded, open-source, cross-platform runtime
environment for building fast and scalable server-side and networking
applications. It runs on the V8 JavaScript runtime engine, and it uses event-
driven, non-blocking I/O architecture, which makes it efficient and suitable for
real-time applications.
● What is node JS in simple words?
● Is node JS for frontend or backend?
● What is Benefits of NodeJs?

14. What is REST API??

15. APIs are mechanisms that enable two software components to communicate with
each other using a set of definitions and protocols.
A REST API (also known as RESTful API) is an application programming interface (API
or web API) that conforms to the constraints of REST architectural style and allows
for interaction with RESTful web services. REST stands for representational state
transfer
The primary goal of API is to standardize data exchange between web services. Depending
on the type of API, the choice of protocol changes. On the other hand, REST API is an
architectural style for building web services that interact via an HTTP protocol.

17. When a client makes a request via a RESTful API, it transfers the information/representation of
the request or response from user to Webservice or vice versa through HTTP format.
REST APIs faster and more lightweight, with increased scalability—perfect for Internet of Things
(IoT) and mobile app development.
Request Method:
The request action should be indicated by the HTTP request method. The most common methods include GET, POST, PUT,
and DELETE.·
● GET retrieves resources. (From the above example: Get the menu list or food)
● POST submits new data to the server.(Order new food item to your order list)
● PUT updates existing data.(Changing from one variety to another like veg to non-veg)
● DELETE removes data.(Cancelling an item if it takes more time)
Response Method:
We can develop REST API, programming them to send the response according to the input header of the HTTP request. There
is a Media-Type attribute in the header which can be used in such cases and the response can be sent accordingly.
REST API can return both XML or JSON as response message, depending upon the Media-Type attribute in the HTTP request.
REST API must always return an appropriate Status code to the user/client so that the user/client can know the actual issue and
process accordingly.

18. HTTP Status Code Description:
● 1xx: Informational: It represents the request that has
been received, and it is in the continuing process.
● 2xx: Success: Success represents the HTTP Server
response that the server has successfully received
and understood the request.
● 3xx: Redirection: It indicates that further action must
be taken to fulfil the request.
● 4xx: Client Error: It represents an error when the
request has incorrect syntax or cannot complete the
request.
● 5xx: Server Error: The server has failed to fulfil a
valid request.

19. Thank You