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Online Web Tutorials

how to install ssl certificates for website in ubantu using cmd?

  • Centos Server
  • May 03, 2025

To install SSL certificates for website on an Ubuntu server using the command line, you can use Let's Encrypt with Certbot, which is free and wide...

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Node js - axios Module

  • Node js
  • April 25, 2025

 Axios Module make HTTP requests from your Node.js server or script, like fetching or sending data to APIs. Install axios Module npm ins...

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Node Js - JSON API

  • Node js
  • April 25, 2025

What is a JSON API? A JSON API is a type of web API (Application Programming Interface) that uses JSON (JavaScript Object Notation) as the format f...

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How to established MongoDB server connection in MongoDB Compass?

  • MongoDB
  • February 15, 2025

1. Check if MongoDB is Running using below cmd sudo systemctl status mongod If MongoDB is not running, start it: sudo systemctl start mongo...

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i want to disable all ModSecurity Rule in centos?

  • Centos Server
  • September 07, 2024

To disable all ModSecurity rules on CentOS, you can either disable the entire ModSecurity engine or turn off the rules globally for your web server (A...

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how to install free ssl certificate in centos 7?

  • Centos Server
  • September 07, 2024

Step 1: Install Certbot via Snap (Recommended by Let's Encrypt) To avoid compatibility issues with the package manager, you can install Certbot...

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React JS MCQs 12

  • React JS
  • May 10, 2024

111. What is the purpose of the `useEffect` hook in React? a) To manage component state b) To perform side effects after every render (Cor...

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React JS MCQs 11

  • React JS
  • May 10, 2024

101. In React, which lifecycle method is called when a component is about to update? a) componentWillMount b) componentDidUpdate c) com...

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React JS MCQs 10

  • React JS
  • May 10, 2024

What will be the output of the following React component? import React from 'react'; const MyComponent = () => {   co...

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React JS MCQs 9

  • React JS
  • May 10, 2024

Which of the following statements correctly imports React in a JSX file? a) import React from 'react'; (Correct Answer) b) re...

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React JS MCQs 8

  • React JS
  • May 10, 2024

What is the purpose of the children prop in a React component? a) It represents the child components rendered inside the component (Corr...

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React JS MCQs 7

  • React JS
  • May 10, 2024

What is the purpose of the useRef hook in React? a) To create references to DOM elements or React components (Correct Answer) b) To m...

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React JS MCQs 6

  • React JS
  • May 10, 2024

In React, which method is called before the component is removed from the DOM? a) componentWillUnmount (Correct Answer) b) componentD...

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React JS MCQs 5

  • React JS
  • May 10, 2024

Which of the following lifecycle methods is called only once, after the initial render? a) componentWillMount b) componentDidMount (C...

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React JS MCQs 4

  • React JS
  • May 10, 2024

What is the purpose of the useRef hook in React? a) To create references to DOM elements or React components (Correct Answer) b) To m...

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React JS MCQs 3

  • React JS
  • May 10, 2024

What is the purpose of the useCallback hook in React? a) To memoize functions so that they are not recreated on every render (Correct An...

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React JS MCQs 2

  • React JS
  • May 10, 2024

What is the purpose of keys in React lists? a) To uniquely identify list items and help React identify which items have changed, added, ...

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React JS MCQs 1

  • React JS
  • May 10, 2024

What is React JS? a) A JavaScript library for building user interfaces (Correct Answer) b) A server-side scripting language c) A r...

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MYSQL MCQs - 10

  • MYSQL
  • April 22, 2024

What is the purpose of the AVG() function in MySQL? A) To return the maximum value of a column B) To return the minimum value of a co...

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MYSQL MCQs - 9

  • MYSQL
  • April 22, 2024

What is the purpose of the IFNULL() function in MySQL? A) To check if a value is null B) To return the first non-null value in a list...

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