Best Node Js Interview Questions And Answers

Best Node Js Interview Questions And Answers

Essential Node.js Interview Questions and Expert Answers

Best Node Js Interview Questions And Answers

Best Node.js interview questions and answers are essential for employers to assess candidates' proficiency in the technology. These questions explore Node.js's core concepts, including event loop, asynchronous operations, and module system. Understanding these questions helps candidates showcase their knowledge of Node.js's strengths, limitations, and its role in modern web development. Answering these questions effectively demonstrates the candidate's ability to build robust and scalable Node.js applications.

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1 - What is the difference between var, let and const?

  Answer: var is function scoped, let and cck scoped. var can be redeclared, let and const cannot. const must be initialized at declaration.

2) What is the event loop?

  Answer: The event loop is a mechanism that manages events and callbacks in Node.js. It listens for events, such as I/O operations or timers, and when an event occurs, it calls the appropriate callback function.

3) What is the difference between a synchronous and asynchronous operation?

  Answer: A synchronous operation executes code line by line, while an asynchronous operation doesn't wait for a response from the underlying system before moving on to the next line of code.

4) What is a callback function?

  Answer: A callback function is a function that is passed as an argument to another function and is called when a certain event happens.

5) What is a promise?

  Answer: A promise is an object that represents the eventual result of an asynchronous operation.

6) What are the advantages of using Node.js?

  Answer: Node.js is fast, scalable, and cross platform. It also has a large ecosystem of modules and libraries.

7) What are the disadvantages of using Node.js?

  Answer: Node.js can be memory intensive, and it is not as efficient as some other languages for certain tasks.

8) What is a module in Node.js?

  Answer: A module is a file that contains a set of related functions, objects, and variables.

9) What is the difference between a local and a global module?

  Answer: A local module is a module that is installed in the current project, while a global module is a module that is installed in the global npm directory.

10) What is a package.json file?

  Answer: A package.json file is a manifest file that contains information about a Node.js project, such as the project name, version, dependencies, and scripts.

11 - What is a REPL?

  Answer: A REPL (Read Eval Print Loop) is an interactive environment that allows you to enter and evaluate Node.js code.

12) What are some best practices for writing Node.js code?

  Answer: Use async/await instead of callbacks, use promises instead of callbacks when possible, avoid blocking I/O operations, and use a linter to help you write clean and consistent code.

13) What are some resources for learning Node.js?

  Answer: The Node.js documentation, the Node.js community, and online courses and tutorials.

14) What are some common Node.js frameworks?

  Answer: Express, Koa, and Hapi.

15) What are some popular Node.js libraries?

  Answer: Lodash, Moment, and Axios.

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