Tutorial Playlist

Cyber Security Tutorial: A Step-by-Step Guide


What is Cybersecurity?

Lesson - 1

Cyber Security for Beginners

Lesson - 2

How to Become a Cybersecurity Engineer?

Lesson - 3

What is Ethical Hacking?

Lesson - 4

What is Penetration Testing?: A Step-by-Step Guide

Lesson - 5

What Is SQL Injection: How to Prevent SQL Injection

Lesson - 6

How to Become an Ethical Hacker?

Lesson - 7

What Is a Firewall and Why Is It Vital?

Lesson - 8

The Complete Know-How on the

Lesson - 9

A Definitive Guide to Learn the SHA 256 Algorithm

Lesson - 10

What Is a Ransomware Attack and How Can You Prevent It?

Lesson - 11

A Look at the Top 5 Programming Languages for Hacking

Lesson - 12

The Most Informative Guide on What Is an IP Address?

Lesson - 13

The Best Ethical Hacking + Cybersecurity Books

Lesson - 14

10 Types of Cyber Attacks You Should Be Aware in 2022

Lesson - 15

The Top Computer Hacks of All Time

Lesson - 16

Top 6 Cyber Security Jobs in 2022

Lesson - 17

The Best Guide to The Top Cybersecurity Interview Questions

Lesson - 18

What Is a Brute Force Attack and How to Protect Our Data Against It?

Lesson - 19

The Top 8 Cybersecurity Skills You Must Have

Lesson - 20

Your Guide to Choose the Best Operating System Between Parrot OS vs. Kali Linux

Lesson - 21

All You Need to Know About Parrot Security OS

Lesson - 22

The Best and Easiest Way to Understand What Is a VPN

Lesson - 23

What Is NMap? A Comprehensive Tutorial for Network Mapping

Lesson - 24

What Is Google Dorking? Your Way to Becoming the Best Google Hacker

Lesson - 25

Your Best Guide to a Successful Cyber Security Career Path

Lesson - 26

The Value of Python in Ethical Hacking and a Password Cracking Tutorial

Lesson - 27

The Best Guide to Understand What Is TCP/IP Model?

Lesson - 28

What Are Keyloggers and Its Effect on Our Devices?

Lesson - 29

Best Guide to Understand the Importance of What Is Subnetting

Lesson - 30

Your Guide to What Is 5G and How It Works

Lesson - 31

How to Crack Passwords and Strengthen Your Credentials Against Brute-Force

Lesson - 32

A Look at ‘What Is Metasploitable’, a Hacker’s Playground Based on Ubuntu Virtual Machines

Lesson - 33

One-Stop Guide to Understanding What Is Distance Vector Routing?

Lesson - 34

Best Walkthrough for Understanding the Networking Commands

Lesson - 35

Best Guide to Understanding the Operation of Stop-and-Wait Protocol

Lesson - 36

The Best Guide to Understanding the Working and Importance of Go-Back-N ARQ Protocol

Lesson - 37

What Are Digital Signatures: A Thorough Guide Into Cryptographic Authentication

Lesson - 38

The Best Spotify Data Analysis Project You Need to Know

Lesson - 39

A One-Stop Solution Guide to Understand Data Structure and Algorithm Complexity

Lesson - 40

Your One-Stop Guide ‘On How Does the Internet Work?’

Lesson - 41

An Introduction to Circuit Switching and Packet Switching

Lesson - 42

One-Stop Guide to Understanding What Is Network Topology?

Lesson - 43

A Deep Dive Into Cross-Site Scripting and Its Significance

Lesson - 44

The Best Walkthrough on What Is DHCP and Its Working

Lesson - 45

A Complete Look at What a Proxy Is, Along With the Working of the Proxy Server

Lesson - 46

A Detailed Guide to Understanding What Identity and Access Management Is

Lesson - 47

The Best Guide to Understanding the Working and Effects of Sliding Window Protocol

Lesson - 48

The Best Guide That You’ll Ever Need to Understand Typescript and Express

Lesson - 49

Express REST API

Lesson - 50

All You Need to Know About Express JS Middleware

Lesson - 51

An Absolute Guide to Know Everything on Expressions in C

Lesson - 52

A Definitive Guide on How to Create a Strong Password

Lesson - 53

Ubuntu vs. Debian: A Look at Beginner Friendly Linux Distribution

Lesson - 54

Your One-Stop Guide to Learn Command Prompt Hacks

Lesson - 55

Best Walkthrough to Understand the Difference Between IPv4 and IPv6

Lesson - 56

What Is Kali NetHunter? A Deep Dive Into the Hackbox for Android

Lesson - 57

A Perfect Guide That Explains the Differences Between a Hub and a Switch

Lesson - 58

The Best Guide to Help You Understand What Is Network Security

Lesson - 59

What Is CIDR? And Its Importance in the Networking Domain

Lesson - 60
Express REST API

Restful API is very popular and commonly used to create APIs for web-based applications. Express is a back-end web application framework of node js, and with the help of express, we can create an API very easily. This tutorial on Express REST API will walk you through all the topics on Express REST API.

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REST API is the standard way to send and receive data for web services.

A client sends a req which first goes to the rest API and then to the database to get or put the data after that, it will again go to the rest API and then to the client. Using an API is just like using a website in a browser, but instead of clicking on buttons, we write code to req data from the server. It's incredibly adaptable and can handle multiple types of requests



REST (Representational state transfer) is a popular architecture that is used to create web services.

API (Application Programming Interface is a code that allows two software programs to communicate with each other.

REST API is a software that allows two apps to communicate with one another over the internet and through numerous devices.

HTTP Request Types

HTTP Requests are simply messages that are sent by the client to do some tasks on the server

  • GET - Get command is used to request data from the server, but mainly this method is used to read data
  • PATCH - This command is used to update, change or replace the data
  • POST - The post method is used to create new or to edit already existing data
  • Delete - This delete command is used to delete the data completely from the server

API Using Express and Its Architecture

A request is sent by the client in the form of a JSON file, and with the help of an HTTP request which gets a patch post and delete, it will go to the server first then, the server sends back the response to the client in the form of a message to tell what happened to your request.

  • Step 1: First, open your editor. Now open your terminal and write a command npm init -y 


This command will create a JSON file.


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  • Step 2: Now we will install express for that write command

npm install express


This will install dependencies in the package.json file

  • Step 3: Now we will create a new file to write all our code index.js

Write a few lines of code in the first line. We will import the express packages

  • Step 4:


This app.listen will respond to the server to listen on a specific port which we have defined already as a variable 4000

  • Step 5: Then we will write a second argument as a callback to tell the API is working, now lets run this code to check our API is working or node

To run this code, we will write a command node.


  • Step 6: As our code is running fine, let's open our search engine and write localhost:4000, this will not run,
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  • Step 7: Now we need an add the second argument here 



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This article has touched on topics, what is rest API, and HTTP request types, and we also have created a simple Rest API. You can also enroll in Simplilearn's Node JS certification training to learn more about express. This certification training course will upskill you in using Express.js, NPM, NPM Vet, REST, shrink-wrap, Express.js with MongoDB, and SQLite CRUD operations. This Express JS training focuses on the fundamental ideas of Node JS and Express Js and gives you hands-on experience developing an HTTP server.

If you have any questions on this topic or feedback, do let us know in the comments section of the "Express REST API" article, and our experts will get back to you at the earliest.

About the Author

Anubhav SharmaAnubhav Sharma

Anubhav is a Research Analyst. He enjoys working on dynamic projects where he can learn new things. He is responsible and diligent. Being a resident of Jammu, he loves nature and exploring new places.

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