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Node.js interview questions

Node.js interview questions.

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1.

What is npm?

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2.

What is Node.js?

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3.

What are the two types of API functions in Node.js?

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4.

What is an error-first callback?

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5.

What is Callback Hell?

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6.

What is control flow function?

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7.

What are Event Listeners?

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8.

If Node.js is single threaded then how it handles concurrency?

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9.

Could we run an external process with Node.js?

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10.

What are the key features of Node.js?

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11.

What is the difference between Nodejs, AJAX, and jQuery?

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12.

What are the core modules of Node.js?

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13.

What is global installation of dependencies?

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14.

What do you mean by Asynchronous API?

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15.

What are the benefits of using Node.js?

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16.

What is libuv?

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17.

What is V8?

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18.

What is the difference between returning a callback and just calling a callback?

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19.

List out the differences between AngularJS and NodeJS?

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20.

Is Node a single threaded application?

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21.

What's the difference between operational and programmer errors?

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22.

How you can monitor a file for modifications in Node.js ?

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23.

How to make Post request in Node.js?

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24.

What is Callback?

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25.

What is Chaining in Node?

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26.

What are the global objects of Node.js?

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27.

How to use Buffer in Node.js?

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28.

How can you avoid callback hells?

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29.

What is N-API in Node.js?

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30.

Are you familiar with differences between Node.js nodules and ES6 nodules?

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31.

What is the purpose of setTimeout function?

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32.

How do you debug Node.js applications?

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33.

What is purpose of Buffer class in Node?

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34.

How Node prevents blocking code?

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35.

What's the event loop?

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36.

How to avoid callback hell in Node.js?

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37.

Explain how does Node.js work?

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38.

How does Node.js handle child threads?

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39.

What is the relationship between Node.js and V8?

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40.

Explain the concept of Domain in Node.js

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41.

What is REPL in context of Node?

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42.

What is stream and what are types of streams available in Node.js?

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43.

What are streams?

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44.

What is Event Loop?

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45.

What is Event Emmitter?

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46.

What is the preferred method of resolving unhandled exceptions in Node.js?

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47.

What is a blocking code?

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48.

When should we use Node.js?

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49.

When should I use EventEmitter?

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50.

What is difference between synchronous and asynchronous method of fs module?

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51.

What are the use cases for the Node.js "vm" core module?

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52.

Rewrite promise-based Node.js applications to Async/Await

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53.

How to gracefully Shutdown Node.js Server?

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54.

Why to use Buffers instead of binary strings to handle binary data ?

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55.

How can you listen on port 80 with Node?

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56.

How the V8 engine works?

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57.

Does Node.js support multi-core platforms? And is it capable of utilizing all the cores?

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58.

Is it possible to use "Class" in Node.js?

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59.

What is LTS releases of Node.js why should you care?

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60.

Is Node.js entirely based on a single-thread?

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61.

When to not use Node.js?

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62.

What is Piping in Node?

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63.

What is the purpose of __filename variable?

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64.

What's the difference between dependencies, devDependencies and peerDependencies in npm package.json file?

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65.

How would you handle errors for async code in Node.js?

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66.

Can Node.js work without V8?

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67.

What are async functions in Node? Provide some examples.

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68.

What are the timing features of Node.js?

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69.

Explain usage of NODE_ENV

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70.

What's a stub? Name a use case.

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71.

Name some of the events fired by streams.

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72.

Is Node.js entirely based on a single-thread?

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73.

What tools can be used to assure consistent code style?

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74.

How does the cluster module work? What’s the difference between it and a load balancer?

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75.

How does libuv work under the hood?

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76.

Explain what is Reactor Pattern in Node.js?

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77.

Can Node.js use other engines than V8?

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78.

Why Node.js devs tend to lean towards the Module Requiring vs Dependency Injection?

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79.

How to solve "Process out of Memory Exception" in Node.js ?

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80.

How would you scale Node application?

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81.

What is the difference between process.nextTick() and setImmediate() ?

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82.

Explain some Error Handling approaches in Node.js you know about. Which one will you use?

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83.

What is the purpose of using hidden classes in V8?

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84.

Why do we need C++ Addons in Node.js?

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85.

Why should you separate Express 'app' and 'server'?

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86.

What is V8 Templates?

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87.

How V8 compiles JavaScript code?

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88.

How many threads does Node actually create?

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89.

Provide some example of config file separation for dev and prod environments

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90.

How do you convert an existing callback API to promises?

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91.

Consider following code snippet

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92.

Explain the result of this code execution

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93.

Rewrite the code sample without try/catch block

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94.

What will happen when that code will be executed?

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95.

Explain the result of this code execution

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