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Interview Questions

Q1. What is Full Stack Development?

Full Stack Development involves working on both the front-end (client-side) and back-end (server-side) of web applications.

Q 2. Explain the difference between Frontend and Backend.

Frontend is the user interface and client-side logic, while Backend handles server-side logic, database interactions, and server configuration.

Q 3. What is the MEAN stack?

MEAN stack comprises MongoDB (database), Express.js (backend framework), Angular (front-end framework), and Node.js (runtime).

Q 4. Describe RESTful API.

RESTful API (Representational State Transfer) is an architectural style for designing networked applications, often using HTTP for communication.

Q 5. What is AJAX, and how does it work?

AJAX (Asynchronous JavaScript and XML) allows data to be retrieved asynchronously from the server without refreshing the entire page.

Q 6. Explain the concept of CORS.

Ans6. Cross-Origin Resource Sharing (CORS) is a security feature that controls how web pages in one domain can request and consume resources from another domain.

Q 7. What is the difference between PUT and POST?

PUT is used to update or create a resource, while POST is primarily used to create a new resource.

Q 8. How does OAuth work?

OAuth is an authentication protocol that allows secure access to resources without sharing user credentials. It involves authorization tokens.

Q 9. What is the purpose of package.json in Node.js projects?

Ans.9 package.json is a file that contains metadata about a Node.js project, including dependencies, scripts, and other project-related information.

Q 10. Explain the concept of Middleware in Express.js.

Middleware functions in Express.js have access to the request, response, and the next middleware function, allowing for additional processing.

Q 11. How does React differ from Angular and Vue.js?

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Q 12. What is the Virtual DOM in React?

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Q 13. Describe the MVC architecture.

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Q.14 What is NoSQL and give an example of a NoSQL database.

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Q 15. How does a cookie differ from local storage?

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Q 16. Explain the concept of JWT (JSON Web Tokens).

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Q 17. What is the purpose of the \\\'use strict\\\' statement in JavaScript?

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Q18. Differentiate between state and props in React.

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Q 19. How does SQL injection occur, and how can it be prevented?

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Q 20. What is the purpose of a Docker container?

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Q 21. Explain the concept of closures in JavaScript.

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Q 22. How does prototypal inheritance work in JavaScript?

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Q 23. What is the Event Loop in JavaScript?

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Q 24. How does Asynchronous JavaScript work, and what are Promises?

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Q 25. What is the difference between \\\'let\\\', \\\'const\\\', and \\\'var\\\' in JavaScript?

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Q 26. What is WebSockets, and how do they differ from HTTP?

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Q 27. Explain the concept of memoization in the context of JavaScript.

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Q 28. What is the purpose of the \\\'this\\\' keyword in JavaScript?

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Q 29. How does Cross-Site Scripting (XSS) occur, and how can it be prevented?

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30. Explain the concept of GraphQL.

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Q 31. What is a closure in JavaScript, and why is it useful?

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Q 32. What is the purpose of the HTTP OPTIONS method?

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33. How does a CDN (Content Delivery Network) improve website performance?

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Q 34. Explain the concept of CSRF (Cross-Site Request Forgery) and how to prevent it.

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Q 35. Describe the difference between \\\'undefined\\\' and \\\'null\\\' in JavaScript.

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Q 36. How does the same-origin policy impact web security?

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Q 37. Explain the concept of the Event Delegation pattern.

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Q 38. What is the purpose of the \\\'async\\\' and \\\'await\\\' keywords in JavaScript?

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Q 39. How does the \\

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Q.40 What is a callback function in JavaScript?

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Q 41. Explain the concept of the Single Responsibility Principle in object-oriented programming.

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Q 42. What is the purpose of the \\\'useEffect\\\' hook in React?

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Q 43. How does the \\\'map\\\' function work in JavaScript?

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Q 44. Explain the concept of Cross-Origin Resource Sharing (CORS) in web development.

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Q.45 What is the difference between \\\'==\\\' and \\\'===\\\' in JavaScript?

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Q 46. What is the purpose of the \'defer\' attribute in a script tag?

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Q 47. How does the \\\'localStorage\\\' differ from \\\'sessionStorage\\\' in web storage?

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Q 48. What is the purpose of the \\\'webpack\\\' bundler in web development?

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Q 49. How does SQL injection occur, and how can it be prevented?

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50. Explain the concept of a callback function and provide an example

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