Nodejs interview questions

 Node.Js Interview questions

1. Why do you use mongoose?
2. What is the difference between Authorization and Authentication?
3. Difference between hashing and encryption.
4. Why do we use jwt authentication instead of the session?
5.  What is the use of Indexing in the database?
6. What are the promises and how to handle it?
7. What is middleware? and what is its use of it?
8. What are cookies?
9. How to handle file upload in the nodejs application?
10. What is the use of the multer?
11. what is the difference between multipart and URL-encoded data?
12. What is the aggregation framework in MongoDB
13. What is the cors?
14. What is the difference between var, const, and let?
15. what is the difference between == and ===?
16. What do you mean by the asynchronous nature of Javascript?
17. What is the express js and why we used it?
18. What is callback hell?
19. What is an EventEmitter in Node.js?
20. What is the package.json file?
21. What is the control flow function?
22. For Node.js, why does Google use the V8 engine?
23. What are the different types of HTTP requests?
24. How would you connect a MongoDB database to Node.js?
25. What is the purpose of NODE_ENV?
26. What do you understand by NoSQL databases? Explain.
27. What is the purpose of the Express.js framework in Node.js?
28. How does MongoDB differ from a traditional relational database?
29. What is the role of JavaScript in a full-stack application?
30. How would you implement user authentication and authorization in a Node.js and MongoDB application?
31. Can you explain the difference between a Mongoose model and a MongoDB schema?
32. How do you handle errors in a Node.js and Express.js application?
33. How do you perform data validation in a Node.js and MongoDB application?
34. How do you optimize performance in a Node.js and MongoDB application?
35. How do you implement pagination in a Node.js and MongoDB application?
36. How do you handle file uploads in a Node.js and Express.js application?
37. How do you implement real-time functionality using Node.js and MongoDB?
38. How do you secure a Node.js and MongoDB application?
39. How would you use Node.js to connect to a remote MongoDB instance?
40. How do you handle multiple requests in a Node.js and Express.js application?
41. How do you implement data caching in a Node.js and MongoDB application?
42. How do you handle versioning in a Node.js and MongoDB application?
43. How do you scale a Node.js and MongoDB application?
44. Can you explain the difference between a callback and a promise in Node.js?
45. How do you handle database migrations in a Node.js and MongoDB application?
46. How do you test a Node.js and MongoDB application?
47. How do you implement a RESTful API in a Node.js and Express.js application?
48. How do you connect to a MongoDB database in a Node.js application?
49. Can you explain the difference between a GET and a POST request in a RESTful API?
50. How do you handle CORS (Cross-Origin Resource Sharing) in a Node.js and Express.js application?
51. How do you implement security measures to prevent SQL injection in a Node.js and MongoDB application?
52. How do you handle session management in a Node.js and Express.js application?
53. How do you implement real-time functionality using WebSockets in a Node.js and Express.js application?
54. How do you handle file downloads in a Node.js and Express.js application?
55. How do you use middleware in a Node.js and Express.js application?
56. How do you implement data encryption in a Node.js and MongoDB application?
57. How do you use environment variables in a Node.js application?
58. How do you handle file compression in a Node.js and Express.js application?
59. How do you use Mongoose to create relationships between MongoDB collections?
60. How do you use the async and await keywords in a Node.js application?
61. How do you use the EventEmitter class in a Node.js application?
62. How do you use the Stream API in a Node.js application?
63. How do you implement JWT (JSON Web Token) authentication in a Node.js and Express.js application?
64. How do you use the npm package manager in a Node.js application?
65. How do you use the dotenv package to manage environment variables in a Node.js application?
66. How do you use the npm package nodemon to automatically restart your Node.js application on file changes?