Top 100+ Most Asked Node.js Interview Questions

Comprehensive collection of the most frequently asked Node.js interview questions covering fundamentals, asynchronous programming, streams, clustering, security, and advanced concepts. Each answer is concise, detailed, and interview-ready.

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1.What is Node.js?

2.How does Node.js work?

3.What is NPM?

4.Why is NodeJS single-threaded?

5.If NodeJS is single-threaded, then how does it handle concurrency?

6.Why is NodeJS preferred over other backend technologies like Java and PHP?

7.What is the difference between Synchronous and Asynchronous functions?

8.What are the modules in NodeJS?

9.What is the purpose of the 'require' keyword in NodeJS?

10.What is V8 engine in Node.js?

11.How to handle environment variables in NodeJS?

12.What is control flow in NodeJS?

13.What do you mean by event loop in NodeJS?

14.What is the order in which control flow statements get executed?

15.What are the main disadvantages of NodeJS?

16.What is REPL in NodeJS?

17.How to import a module in NodeJS?

18.What is the difference between NodeJS and Angular?

19.What is package.json in NodeJS?

20.How to create the simple HTTP server in NodeJS?

21.What are the most commonly used libraries in NodeJS?

22.What are promises in NodeJS?

23.How do you install, update, and delete a dependency?

24.Which command used to import external libraries?

25.What is event-driven programming in NodeJS?

26.What is a buffer in NodeJS?

27.What are streams in NodeJS?

28.Explain the crypto module in NodeJS.

29.What is callback hell?

30.Explain the use of the timers module in NodeJS.

31.Difference between setImmediate() and process.nextTick() methods

32.What are the different types of HTTP requests?

33.What is the difference between spawn() and fork() method?

34.Explain the use of the passport module in NodeJS

35.What is a fork in NodeJS?

36.What are the three methods to avoid callback hell?

37.What is a .body-parser in NodeJS?

38.What is CORS in NodeJS?

39.Explain the tls module in NodeJS.

40.Can you access DOM in Node?

41.How do you manage packages in your NodeJS project?

42.What is the purpose of NODE_ENV?

43.What is a test pyramid in NodeJS?

44.What is piping in NodeJS?

45.What is a cluster in NodeJS?

46.Explain some of the cluster methods in NodeJS

47.How to manage sessions in NodeJS?

48.How many types of API functions are there in Node.js?

49.How can we implement authentication and authorization in NodeJS?

50.Explain the packages used for file uploading in NodeJS.

51.Explain the difference between NodeJS and server-side scripting languages like Python

52.How to Connect NodeJS to a MongoDB Database?

53.How to read command line arguments in NodeJS?

54.Explain the NodeJS Redis module.

55.What is web socket?

56.Explain the util module in NodeJS

57.Explain DNS module in NodeJS

58.What is the difference between setImmediate() and setTimeout()?

59.What is an Event Emitter in Node.js?

60.What is a callback function in Node.js?

61.What are the advantages of using promises instead of callbacks?

62.What is the difference between frontend and backend development?

63.What is I/O in Node.js?

64.How is Node.js most frequently used?

65.What are some of the pros and cons of Node.js?

66.What is Express.js?

67.What is the URL module in Node.js?

68.How would you use a URL module in Node.js?

69.How can we use async/await in Node.js?

70.What is JWT, and how do you implement it in Node.js?

71.What is the difference between require and import in Node.js?

72.What does 'non-blocking' mean in Node.js?

73.How does Node.js overcome the problem of blocking I/O operations?

74.What is TLS/SSL in Node.js?

75.How does Node.js differ from other backend technologies?

76.How would you scale a Node.js application?

77.What are the best practices for error handling in Node.js?

78.Why does Google use the V8 engine in Node.js?

79.Why are Java developers increasingly adopting Node.js?

80.Does Node run on Windows?

81.Why should you separate the Express app and server?

82.Explain the concept of stub in Node.js.

83.What is the framework that is used majorly in Node.js today?

84.What are the security implementations that are present in Node.js?

85.What is Libuv?

86.What are global objects in Node.js?

87.What is ExpressJS used for?

88.What is the use of the connect module in Node.js?

89.What are LTS releases of Node.js?

90.What do you understand about ESLint?

91.How does Node.js handle the child threads?

92.How to Enhance Node.js Performance through Clustering?

93.What is a thread pool, and which library handles it in Node.js?

94.How are worker threads different from clusters?

95.How to measure the duration of async operations?

96.How to measure the performance of async operations?

97.What are the types of streams available in Node.js?

98.What is meant by tracing in Node.js?

99.Where is package.json used in Node.js?

100.What is the difference between readFile and createReadStream in Node.js?

101.What is the use of the crypto module in Node.js?

102.What is a passport in Node.js?

103.How to get information about a file in Node.js?

104.How does the DNS lookup function work in Node.js?

105.What is WASI, and why is it being introduced?

106.What is a first-class function in Javascript?